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OK so I checked all the fuses and relay is good. All the lights on the controls are working and the fans both come on. It worked Friday then yesterday I got in the car and no a/c. I've read about a Thermal Limiter may be the cause. Where is this? Can I jump it out to test it? What does it look like? I cannot find answers to these questions. Any help would be Great!! It is toooooooooo hot to drive with no a/c. lol If you think a good mechanic is expensive, try hiring a bad one
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Re: 2007 LX A/C clutch won't engage Quote: Originally Posted by z28ls1 and the fans both come on. The fans would not come on if the thermal limiter was blown. Disconnect the 3 wire AC harness plug on top of the alternator and the fans should quit. Now plug it back in. Since the fans are running when you try to run the AC, that tells me the problem is in the relay and clutch areas. I tap on the clutch relay first, see if it starts working. (Bad contacts, replace relay with the updated version.) If no, then I would pull the clutch relay, and use a simple test light to see if I find 2 powers and 2
grounds in the relays socket. HTH Registered!! Thread Starter
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Re: 2007 LX A/C clutch won't engage OK and where might that clutch relay be? If you think a good mechanic is expensive, try hiring a bad one
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Re: 2007 LX A/C clutch won't engage Quote: Originally Posted by z28ls1 OK and where might that clutch relay be? Ummmm..... Quote: Originally Posted by z28ls1 and relay is good. Just what did you check then? I think the clutch relay is the one closest to fuse #5 in the pic. Look in your
lid, it is labeled with nothing but a plain snowflake. HTH Registered!! Thread Starter
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Re: 2007 LX A/C clutch won't engage I switched relays # 6 & 7 If you think a good mechanic is expensive, try hiring a bad one
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Re: 2007 LX A/C clutch won't engage 6 and 7 in the pic I just posted? Those aren't relays. Registered!! Thread Starter
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Re: 2007 LX A/C clutch won't engage yes a plain snowflake with some type of electrical logo Registered!! Thread Starter
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Re: 2007 LX A/C clutch won't engage and the one at the far left of that has a snowflake also with another type of snowflake in a square box. If you think a good mechanic is expensive, try hiring a bad one
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Re: 2007 LX A/C clutch won't engage Quote: Originally Posted by z28ls1 and the one at the far left of that has a snowflake also with another type of snowflake in a square box. That would be for the AC condensor fan. The AC clutch relay is a plain snowflake by itself. I checked a minute ago, I called it right. Clutch relay is closest to fuse #5 in that pic. HTH Registered!! Thread Starter
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Re: 2007 LX A/C clutch won't engage OK Great! Success!! I tapped on the relay and the a/c came on. I will pick one up tomorrow. Thank You Very much!! I'm in N.C. and it is real hot here. lol If you think a good mechanic is expensive, try hiring a bad one
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Re: 2007 LX A/C clutch won't engage Try to get the updated relay, The original type relay has its share of issues, but is cheaper. Registered!! Thread Starter
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Re: 2007 LX A/C clutch won't engage cool man thanx. now time to hit the sack. later. Registered!!
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Re: 2007 LX A/C clutch won't engage Hello- I'm new to the forums. I have the same problem in my 2007 Civic. The clutch won't engage but both fans on the radiator turn on when I push the AC button. I've tapped on the relay with the single individual snowflake and that didn't help. I pulled the relay and using a voltmeter verified that two of the 4 sockets have 12+ volts of power. Does this mean for certain the relay is bad? I'm willing to buy another relay but hate to buy parts without knowing if indeed the relay is bad. I've also been told I could jump the connection on top of the receiver/dryer and that would tell me if the pressure is low in the AC system but for the life of me I can't seem to find the receiver dryer. The engine bay in the 2007 civic is super cramped. If you think a good mechanic is expensive, try hiring a bad one
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Re: 2007 LX A/C clutch won't engage Quote: Originally Posted by blackwaterstout but both fans on the radiator turn on when I push the AC button. This says the system has enough freon to run. Quote: I've tapped on the relay with the single individual snowflake and that didn't help. Swap with an identical relay to test it. Quote: I pulled the relay and using a voltmeter verified that two of the 4 sockets have 12+ volts of power. Does this mean for certain the relay is bad? No. You only checked HALF of the circuits involved. Can't condemn anything until after testing is complete. You found 2 terminals with B+. You can also jumper the 2 largest terminals in the socket to check the clutch operation. (Do NOT jumper the 2 smaller terminals, you may roast the PCM!) Quote: I'm willing to buy another relay but hate to buy parts without knowing if indeed the relay is bad. Swap to test. Quote: I've also been told I could jump the connection on top of the receiver/dryer and that would tell me if the pressure is low in the AC system but for the life of me I can't seem to find the receiver dryer. The engine bay in the 2007 civic is super cramped. Don't worry about it, that isn't your problem right now. The system has enough freon to operate. The fans would not run if the freon was empty. HTH
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Re: 2007 LX A/C clutch won't engage Quote: Originally Posted by ezone This says the system has enough freon to run. Swap with an identical relay to test it. No. You only checked HALF of the circuits involved. Can't condemn anything until after testing is complete. You found 2 terminals with B+. You can also jumper the 2 largest terminals in the socket to check the clutch operation. (Do NOT jumper the 2 smaller terminals, you may roast the PCM!) Swap to test. Don't worry about it, that isn't your problem right now. The system has enough freon to operate. The fans would not run if the freon was empty. HTH Okay here is an update. I swapped the relay with the the other relay that has the snowflake and fan blade on it. Nothing changed. I then took my voltmeter and held the negative to the neg battery terminal and probed the 4 holes with the positive. Only the left most hole registered and voltage. I'm not sure what you mean by B+. Pardon my ignorannce. Is that the positive battery terminal? Registered!!
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Re: 2007 LX A/C clutch won't engage Update #2 With the test probe grounded slot 1 and slot 3 has voltage. The other slots have no voltage. With test probe on the positive battery terminal slot 4 has 13+ volts but slot 2 has nothing. What does this tell me? I assume the relays are both fine since swapping them made no difference. I also assume since the fans both kicked on that I have ample pressure in the lines. Attached Thumbnails If you think a good mechanic is expensive, try hiring a bad one
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Re: 2007 LX A/C clutch won't engage Quote: I'm not sure what you mean by B+. Pardon my ignorannce. Is that the positive battery terminal? Exactly. Quote: Originally Posted by blackwaterstout Update #2 With the test probe grounded slot 1 and slot 3 has voltage. The other slots have no voltage. With test probe on the positive battery terminal slot 4 has 13+ volts but slot 2 has nothing. What does this tell me? I assume the relays are both fine since swapping them made no difference. I also assume since the fans both kicked on that I have ample pressure in the lines. Handy diagram, I like it. 1 and 2 are from the contacts of the relay. In this relay design, when the coil is energized the contacts close to complete a circuit, just like the light switch on a wall in the house. In this application, power is supplied from a fuse to one terminal of the pair, the other terminal goes to the load (AC clutch in this case.) That said...... Quote: but slot 2 has nothing. So there is no continuity through the electromagnetic coil circuit from the relay socket to (and including) the compressor clutch. Examine that circuit: The clutch coil and pulley sets are available separately from the compressor, if need be. HTH Registered!!
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Re: 2007 LX A/C clutch won't engage Quote: Originally Posted by ezone Exactly.
Handy diagram, I like it. 1 and 2 are from the contacts of the relay. In this relay design, when the coil is energized the contacts close to complete a circuit, just like the light switch on a wall in the house. In this application, power is supplied from a fuse to one terminal of the pair, the other terminal goes to the load (AC clutch in this case.) That said...... So there is no continuity through the electromagnetic coil circuit from the relay socket to (and including) the compressor clutch. Examine that circuit: The clutch coil and pulley sets are available separately from the compressor, if need be. HTH excellent help. I really appreciate it. There is a connector with 3 wires on top of the alternator. All 3 are red. When you say own check the clutch
do you mean checking resistance from one end if the switch to the other? If you think a good mechanic is expensive, try hiring a bad one
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Re: 2007 LX A/C clutch won't engage There is a connector with 3 wires on top of the alternator. All 3 are red. That's it. I said OHM.
the clutch do you mean checking resistance from one end if the switch to the other? Sorry. A good compressor clutch coil will have a resistance of 2-5 ohms (roughly). So you are looking for this measurement through the wiring. You could go directly to the clutch connector and check there if you want to (hell, it could just be unplugged), but I usually check at the most convenient places first. Meter set to OHMs. Lowest scale, like 0-200 ohms if you have a choice. Whatever is closest to zero ohms. You could start at the relay socket terminal that had no reading before, but we already know it's the problem area and won't move the meter. Move down the line: Disconnect the 3 wire connector on top of the alternator. Move down the line: Should this be done with the engine running and ac on? No. Everything OFF for resistance checking. --------------------------------------------------- HTH Last edited by ezone; 07-11-2012 at 06:59 PM. Reason: I edited this, recheck it! Registered!!
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Re: 2007 LX A/C clutch won't engage Quote: Originally Posted by ezone There is a connector with 3 wires on top of the alternator. All 3 are red. That's it. I said OHM.
the clutch do you mean checking resistance from one end if the switch to the other? Sorry. A good compressor clutch coil will have a resistance of 2-5 ohms (roughly). So you are looking for this measurement through the wiring. You could go directly to the clutch connector and check there if you want to (hell, it could just be unplugged), but I usually check at the most convenient places first. Meter set to OHMs. Lowest scale, like 0-200 ohms if you have a choice.
Whatever is closest to zero ohms. You could start at the relay socket terminal that had no reading before, but we already know it's the problem area and won't move the meter. Move down the line: Disconnect the 3 wire connector on top of the alternator.
Move down the line: Should this be done with the engine running and ac on? No. Everything OFF for resistance checking.
--------------------------------------------------- HTH I disconnected the 3 wire switch on the alternator. I tested the resistance across all 6 leads (3 going to compressor and 3 going in opposite direction into a wire harness). I got nothing across any of the leads. I wanted to test resistance on the wires at the compressor however the engine was way too hot to stick my arm down far enough to reach it. That manifold would've burned the crap out of me. I will try again tomorrow after everything cools down and I can reach it. What do you expect will happen? If I get a reading on any of the three wires does that mean I have a faulty wire or connector going from the alternator to the compressor? Thanks again for walking me through this step by step. It's extremely helpful. If you think a good mechanic is expensive, try hiring a bad one
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Re: 2007 LX A/C clutch won't engage Damn, the ohm symbol didn't transfer to here. disconnected the 3 wire switch on the alternator I HOPE you disconnected a CONNECTOR, not a switch. Sorry, I'm very technical here, little things like this can make a huge difference. across all 6 leads I
said check 3, not 6. Not important now. Next step is checking the component ON the compressor. Test at the terminal for the clutch coil itself. (NOT the wires on the cars harness) If there is no wiring damage, I'd expect it needs a field coil for the clutch (complete clutch set). HTH Registered!!
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Re: 2007 LX A/C clutch won't engage So if there is no continuity, there is an open circuit in the clutch field coil, and it needs replaced? How often does this happen? That is what my '07 GX is doing, starting this afternoon while in Baker, CA (+115 deg). What a PITA! I finally pulled the lower connector apart and still got nothing. Would you recommend changing the entire clutch assy? Honda sells the clutch assembly, but doesn't appaer to have the field coil set, and the field coil set don't have the clutch. Last edited by darkstarchuck; 07-11-2012 at 11:28 PM. Reason: Another question. Registered!!
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Re: 2007 LX A/C clutch won't engage Guys, rally appreciate this discussion. I live in Germany and on the way back from Italy my A/C cutout so am following this diagnostic tree with great interest! If you think a good mechanic is expensive, try hiring a bad one
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Re: 2007 LX A/C clutch won't engage Quote: Originally Posted by darkstarchuck So if there is no continuity, there is an open circuit in the clutch field coil, and it needs replaced? Yes, unless you think you can rewind the electromagnetic field coil yourself. Quote: How often does this happen? Only when it goes bad this way. Actually, it's just one of many things and ways that the system can break. **** don't last forever. Quote: That is what my '07 GX is doing, starting this afternoon while in Baker, CA (+115 deg). What a PITA! Always at the worst possible times. Quote: I finally pulled the lower connector apart and still got nothing. Would you recommend changing the entire clutch assy? Honda sells the clutch assembly, but doesn't appaer to have the field coil set, and the field coil set don't have the clutch. I live in the rust belt. The pulley doesn't always come off cleanly, so I always like to have it ready if it ends up being needed. I have even had the snout of the compressor snap off trying to remove the pulley and bearing. It doesn't always go by the book. **** happens, deal with it. Also: On earlier replies I said to check at the connector right on the compressor, but according to the wire diagram there may not be any. The only one shown in the diagram is on top of the alternator. Registered!!
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Re: 2007 LX A/C clutch won't engage Here's a picture. Thanks for the comments..... Attached Thumbnails If you think a good mechanic is expensive, try hiring a bad one
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Re: 2007 LX A/C clutch won't engage Ok, if you can access that little bullet connector, test there. If open circuit, that coil is either bad, or its ground is bad (usually bolted to top of compressor, never seen one bad so far though). Registered!!
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Re: 2007 LX A/C clutch won't engage Easy enough to separate one handed. Was fairly certain after checking the 3 prong connector above. It will get plugged back in after the new compressor with new coil and clutch is installed. No sense only changing the only the clutch/coil when the compressor already has used at least 1/2 of it's life. $350 for new parts including the receiver, and access to an evac pump, make that decision easy. Registered!!
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Re: 2007 LX A/C clutch won't engage Quote: Originally Posted by ezone Yes, unless you think you can rewind the electromagnetic field coil yourself. Only when it goes bad this way. Actually, it's just one of many things and ways that the system can break. **** don't last forever. Always at the worst possible times. I live in the rust belt. The pulley doesn't always come off cleanly, so I always like to have it ready if it ends up being needed. I have even had the snout of the compressor snap off trying to remove the pulley and bearing. It doesn't always go by the book. **** happens, deal with it. Also: On earlier replies I said to check at the connector right on the compressor, but according to the wire diagram there may not be any. The only one shown
in the diagram is on top of the alternator. So there is nothing for me to test at the compressor. I've been trying to figure out how to get t plastic skid plate off from underneith the car to no avail. If you think a good mechanic is expensive, try hiring a bad one
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Re: 2007 LX A/C clutch won't engage Quote: Originally Posted by darkstarchuck No sense only changing the only the clutch/coil when the..... $350 for new parts including the receiver Good luck. Inferior quality aftermarket parts are a darn good reason for me to replace only the clutch and coil on an original compressor. I can do the job without opening the system too. If you think a good mechanic is expensive, try hiring a bad one
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Re: 2007 LX A/C clutch won't engage Quote: Originally Posted by blackwaterstout I've been trying to figure out how to get t plastic skid plate off from underneith the car to no avail. You mean you can't undo the "dammit pins"? This one is easy, a small screwdriver pops them apart They also use pins without the 2 slots. These pliers make short
work of them Or, a small hook tool can dig under the center part and lift it Or just break off the stuck pins (I break them all the time), then use zip ties to reattach or buy more pins. HTH Where is the fuse for my AC compressor?Where is the AC fuse on most HVAC systems? They're typically in the unit's control board. This board can often be found behind an access panel on the unit's lower compartment. While some panels must be unscrewed to access the control board, others have clips that are lifted to remove the panel.
Do car AC compressors have a fuse?The correct fuses to check are the fuses that control your ventilation system, your AC compressor's magnetic clutch, and the fuses for your vehicle's electric fans. If any of these fuses are blown, it could lead to your AC system either not coming online, or only working for a few minutes.
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2007 honda civic ac compressor fuse location
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