Electrical & Lights Air Con Recharged but still not cold?

Discussion in '1st Generation (2004-2011)' started by Paulcornwall, Thursday 25th Jun, 2015.

  1. Paulcornwall Club Member ★ ☆ ☆ ☆ ☆

    United Kingdom Paul Penzance
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    Having some trouble with my AC. The condenser kicks in fine but blows out ambient air. Today I had the car 're-gassed' at ATS, however the problem is still not solved. The car passed the leak test on the machine and the guy said it needed very little gas (still got charged the £46, arghh!). Does anyone have any suggestion on what I could check next or what the problem could be?
     
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  2. Paulcornwall Club Member ★ ☆ ☆ ☆ ☆

    United Kingdom Paul Penzance
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    Just had another look and the front 2 fans start when the ac is turned on. I'm unsure if I'm looking at the compressor (is this the bottom most component off the aux belt?), if so although spinning, the centre does not rotate when the air con is on, is this knackered?
     
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  3. SpeedyGee Administrator Staff Team

    England Speedy Birmingham
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    That doesn't sound like it's engaging. Best to check out the compressor relay first.
     
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  4. jd1959 Valued Contributor ★ ★ ★ ☆ ☆

    Ireland Zack Kilkenny
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    +1 on the relay, it seems to be a very common fault in many different Honda's. One positive is that it's cheap and easy to fix.
     
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  5. Paulcornwall Club Member ★ ☆ ☆ ☆ ☆

    United Kingdom Paul Penzance
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    Thats the one under the bonnet right? The diagram on the bottom of the cover is not that clear, could someone confirm the one I need to test?
     
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  6. Paulcornwall Club Member ★ ☆ ☆ ☆ ☆

    United Kingdom Paul Penzance
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    ??

    image.
     
    Last edited by a moderator: Friday 26th Jun, 2015
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  7. jd1959 Valued Contributor ★ ★ ★ ☆ ☆

    Ireland Zack Kilkenny
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    Usually it is a omron or mitsuba type, new part number is 39794-SDA-A05, sorry I couldn't help tell you which one it is I can't find a diagram online at the moment. Although not the proper way to test (and I'll probably be told off) I pushed hard on the top of the suspect relays while the engine was running till I hit the one that turned on the compressor. Might be worth a try.
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    Found the diagram looks like the denso one you have the finger on is correct for the ac compressor and the one below for the radiator fans with ac on.
     
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  8. Paulcornwall Club Member ★ ☆ ☆ ☆ ☆

    United Kingdom Paul Penzance
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    Tried swapping the relays and still no success. Don't know what else to try?
     
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  9. Zebster Expert Advisor ★ ★ ★ ★ ★

    United Kingdom .
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    If the compressor kicks in and you have plenty of gas, then it could be the evaporator that's failed. Hard to check that directly though.
     
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  10. jd1959 Valued Contributor ★ ★ ★ ☆ ☆

    Ireland Zack Kilkenny
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    With the relays swapped did the fans still turn on?
     
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  11. Paulcornwall Club Member ★ ☆ ☆ ☆ ☆

    United Kingdom Paul Penzance
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    Yes, fans still switched on with relays swapped. Looks like the compressor clutch is not responding, just to confirm the compressor is the unit at bottom of the auxiliary drive belt, am I looking at the right part?
     
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  12. Zebster Expert Advisor ★ ★ ★ ★ ★

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    Compressor is towards the bottom, at the front of the engine... it's a fairly big unit with pipes going to it.
     
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  13. jd1959 Valued Contributor ★ ★ ★ ☆ ☆

    Ireland Zack Kilkenny
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    If the compressor clutch is not engaging my next step would be to get 12v to it to see if the problem lies in the magnetic clutch or elsewhere, but this is rapidly going beyond my experience so hopefully someone else will be able to help with trouble shooting. Another possibility that hasn't mentioned is the simple one of checking the fuses.
     
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  14. Beefy Expert Advisor ★ ★ ★ ★ ★

    United Kingdom Stoke
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    Take it to Honda or a garage that specialises in A/C. A/C is one thing you should not be touching unless you have an f-gas licence or know what you are doing.
     
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  15. Paulcornwall Club Member ★ ☆ ☆ ☆ ☆

    United Kingdom Paul Penzance
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    Ok so I've been out in the fog and tried shorting out the ac relay socket - nothing! Clutch still not engaging. Dad has a FR-V so I tried shorting out the pins on his and immediately I could hear the click of the clutch engaging, but with mine...nothing. I'm now wondering if there's even power going to the relay and perhaps this is a electrical fault? Can anyone give me any more direction before giving in?
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    Is there just the one fuse for the compressor / air con? I'm thinking there's a power issue here?
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    A Google search reveals possible low pressure switch fault, does anyone have a pic of its location?...please!
     
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  16. jd1959 Valued Contributor ★ ★ ★ ☆ ☆

    Ireland Zack Kilkenny
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    From my very limited understanding of Honda AC systems there are pressure/temperature/sun etc. related sensors involved with the running of the compressor. As @Beefy alludes to the system mistreated can cause a whole host of safety and environmental issues not to mention legal if in certain jurisdictions so for myself if it doesn't involve a very basic relay/fuse or obvious loose wire I'd leave it to the professionals. (painful to the wallet I know but....)
     
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  17. Zebster Expert Advisor ★ ★ ★ ★ ★

    United Kingdom .
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    Run a battery feed directly to the compressor clutch to see if you can make it cut in. Then you'll know if the problem is in the electrical feed, or something inside the compressor assembly. If it's electrical then it should be an easy fix, if it's the compressor clutch then it could be a bit tougher. On Civics (at least) it's possible to re-shim the compressor clutch to repair it (a kit is available) WITHOUT loss of refrigerant... AC Condenser Overhaul - Shim Replacement - Civinfo
     
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  18. Paulcornwall Club Member ★ ☆ ☆ ☆ ☆

    United Kingdom Paul Penzance
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    I'll give that a shot once the weather clears a bit. I'll need to get under the car and have a good look. Is it fairly obvious which wire is the 12v feed to the compressor? does anyone know the colour of the wire I need to jump the 12v too? Sorry for all the questions.
     
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  19. Zebster Expert Advisor ★ ★ ★ ★ ★

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    You are lucky to have a similar working vehicle for comparison. Take readings from the working one to identify the correct polarity.
     
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  20. Paulcornwall Club Member ★ ☆ ☆ ☆ ☆

    United Kingdom Paul Penzance
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    So I've had a good look. I checked the supply directly to the compressor and its just over 14v when the ac is switched on. The ground is good. I've also fed a 12v directly to the compressor and from the battery and still no joy. I can only 'assume' the compressor is dead, unless theres another over-riding factor that would stop the compressor from engaging with a direct 12v feed?
     
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