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Discussion Starter #1
Hi all

Civic FN2 Type R ('09)

So my aircon was functioning very poorly, but I could still hear the compressor kicking in therefore I got it regassed and it was instantly back to amazing, but then over a period of maybe a week the performance quickly tailed off and then back to nothing. The garage checked the gas and it was fine, no leak. I'm kinda (50/50) sure that the compressor was still kicking in at this point despite no cooling performance. I left it for a while since the weather cooled but I've returned to try to fix it. Research lead me to believe the AC relay was likely the problem but I've just replaced this, for the new version of the relay (Genuine Honda Civic Mitsuba Air Con Relay-2006-2011 (39794SDAA05) ) that doesn't suffer from the potential moisture ingress and the compressor still fails to come on.

The chap at the garage mentioned something about having experience with having to plug the car in and reset the aircon system electronically but his computer didn't have the correct model so he couldn't do it. Is there any merit to this suggestion? Seems coincidental for the regassing to fix the problem, but then very shortly after have the compressor fail?

Therefore my question is what now, after replacing the relay and having no success. Do I just have to assume the compressor has failed or is there some other trouble shooting that I can do?

TL;DR No air con (compressor OK) -> regassed -> Air Con OK -> Air Con tails off over a week -> Gas checked, no leak -> Compressor not working -> Relay replaced -> Compressor still not working -> What now?
 

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No gas loss you say, good.

There are high and low sensors that may be preventing the AC engaging? Check their contacts?

Only other suggestion is the AC clutch.

Has an AC specialist looked it over?
 

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Discussion Starter #3
No gas loss you say, good.

There are high and low sensors that may be preventing the AC engaging? Check their contacts?

Only other suggestion is the AC clutch.

Has an AC specialist looked it over?
Thanks for your prompt reply. The chap in the garage that regassed it looked at it briefly, but I don't think they would qualify as an AC specialist. I could of course take it to a Honda main dealer but I'd rather not if at all possible, since I have a family member who is a mobile mechanic although not an AC specialist, therefore I'd rather he do whatever work is required than pay Honda's rates.

Regarding the aforementioned high and low sensors, where would I find these? Is this trouble shooting that a mechanic (not an AC specialist) could do?

Thanks again
 

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No problem.

A specialist might be worth contacting and may even save you money in the long run.

Take a look at the Kings Honda website for your model/year. There you'll see exploded parts diagrams and part numbers ;)
 

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hi there the first thing I would check is whether the compressor clutch is working
to check this remove the relay from the fusebox there should be 4 pins on the relay 2 small and 2 large
switch on the ignition one of the large terminals should have a positive 12v supply if not check all fuses
if there is 12v at one of the large terminals then bridge the 2 large terminals with a sutible wire link and you should hear the clutch engaging with a clunk each time you connect the wire (don't start the engine you will hear the clutch easyer)
if there is no noise from the clutch then either the clutch is faulty or there is a break in the wireing
if the clutch is engaging ok then the next step would be to read the aircon ecu for fault codes


I hope this helps thanks jox
 
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