A\C problem

Joined
12 January 2006
Messages
98
Location
Hessen, Germany
Good day everyone, I am the proud owner of a (thing of pleasure) 96 nsx in Germany. My A\C is not working, took the car to an A\C specialist and he told me that the problem is that the magnetic clutch in the compressor does not engage and needs to be replaced. Honda wants to replace the entire compressor. I would like to know if anyone has experience replacing the clutch in the compressor or the compressor, since I intend to buy the clutch and replace it myself. I already checked everything else (thanks to prime). Any assistance will be greatly appreciated.
 
69XSN said:
... I would like to know if anyone has experience replacing the clutch in the compressor or the compressor, since I intend to buy the clutch and replace it myself. I already checked everything else (thanks to prime). Any assistance will be greatly appreciated.

Sure you can replace just the clutch - it is quite involved to get access to the compressor however, as a lot of the subframe stuff has to be removed to get to it. The advantage of just replacing the clutch is of course you wouldn't have to evacuate the freon system. A lift would be a huge advantage for access but is not absolutely required.

Before you go tearing into the project however I would make sure that indeed the clutch is bad and it isn't actually the case that the signal to engage it is not there. It is far more likely that you have a low pressure, which would inhibit the compressor from turning on, or a problem with the Climate controller module.
Both of these are quite prolific failures whereas I haven't actually ever heard of a compressor clutch failure.
It could also be something as simple as the compressor relay.

If you have a voltage tester, check the output from the compressor relay for voltage before you go any further then work backwards from there if not or forward per your original plan. A very simple test would be to pull the relay, check for voltage on pin 1, then jumper between pin 1 & 3 to see if you can hear the clutch solenoid clicking (It is quite loud but if necessary have someone check by the right rear wheel while you apply the jumper & remove it several times) There is no need (actually preferred not) to have car running or even ignition or AC switched on while you do this test.

Quick question - when you call for AC, do your condenser fans run? (the two fans in the openings under each of the front lights)
 
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Yes the fans do engage and the compressor also gets power (can be turned on or off by A\C switch) but it will not engage. Even the rpms move up like the compressor is engaging but there is no (click) sound.
 
First and foremost thanks to prime for the wealth of information posted here. Got my A\C working again, with a knowledge assistant. Went into compressor to replace clutch (easier than i thought only slight blunder was the engine mount bolt on the crossmember, which i trying to remove from the wrong side :confused: it helps to have a droplight) After replacing the clutch (those snap rings can be a pain, without the correct kind of snapring pliers) and hanging the compressor back on the mount, clutch still won't engage. By the way i cleaned the clutch cover and the other plate like thingy, which were rusted on the inside. That may have solved my problem, since both old and new clutch would magnetize when hooked to a battery. I also removed and lightly cleaned connector on what must be a selenoid on the high pressure line( the connector next to the small charging port on a 96). So after getting really frustrated (was thinking of the money i would have to pay honda to fix the problem:biggrin: ). anyway after checking almost everything again, my knowledgeable assistant decided to lightly tap on the clutch cover while i hit the A\C button on and off, and what do you know my A\C started working. I'm not sure what solved the problem. so in closing i would like to ask if anyone has had a similar problem and knows what it may have been. Thanks prime.
 
69XSN said:
... I also removed and lightly cleaned connector on what must be a selenoid on the high pressure line( the connector next to the small charging port on a 96). ....

That is the three way pressure switch - pressure too high or too low inhibits the compressor clutch.
(Doesn't sound like that's your problem though)

Sounds like you have a bad connection/bad ground on the clutch assembly?

Yeah, that cross-member nut gets em every time! :biggrin:
(It's a pain to put back on too! something sticky to hold it in place helps)
 
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