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Registered
Join Date: Jun 2005
Posts: 3
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AC not cool
My 1984 944 AC is not blowing cool. It is blowing air and it is "clutching" which slows down the engine and proves the compressor is pumping. It seems obvious that it is a loss of coolant charge, but it was a very sudden change - worked fine last week - so I find that a bit hard to believe. Are there any other likely issues like fuses, controls/switches/sensors?
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06-30-2008, 03:55 PM
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Just thinking out loud
Join Date: Nov 2001
Location: Close by
Posts: 6,884
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O rings, hoses, and the front seal on the compressor are likely targets. The clutch on the compressor may be shorting to ground too. Look for grimey build up at every fitting, and on the compressor.
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83 944 91 FJ80 84 Ram Charger (now gone) |
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06-30-2008, 05:27 PM
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Nobody Special
Join Date: Jul 2003
Location: NorCal
Posts: 522
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There's a low Freon level sensor that once you hit that threshold it will cycle the compressor all the time until it kicks off completely which isn't usually too far behind. Try to top off with whatever refrigerant was used. More than likely though you have a slow leak at the compressor or in one of the connections. If you live in a very hot climate I don't think you will be happy with an R-134a conversion unless 90% of your driving is done at freeway speeds, especially on an early car.
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86 - 951 - Garrett dbb T3/T4R/Tial/Maxtronic -SOLD 91 - BMW 325 iX AWD, 5-spd Coupe, Lazur Blau Metallic-SOLD 86 - 951-K26/8, daily driver-SOLD 87 - 944S - Another daily driver-SOLD |
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06-30-2008, 06:50 PM
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Join Date: Jan 2008
Posts: 53
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I just did an R134 conversion and I can say its not too bad.. its nothing like my old fiero which was an icebox in 30 seconds and you needed to blast the heat to melt the icicles forming in your nose.... but the R134 after its been pumping for a min or 2 is pretty cold.... i just hope you don't have a black car like me because A/C is honestly a wast of time at that point haha.
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06-30-2008, 10:40 PM
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Join Date: Nov 2001
Location: Melbourne, Florida
Posts: 431
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Does it start out cool befroe the engine warms up?
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1986 951 |
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07-01-2008, 01:51 AM
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Join Date: Jul 2004
Posts: 43
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Might want to check the high and low side pressures.
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07-01-2008, 10:34 AM
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Join Date: Mar 2008
Posts: 474
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So you are saying if the Freon is gone in your AC the AC will no longer ingauge ?
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 1990-Porsche 944 S2 Project Hair Loss 2001-Saab 9-5 BSR Best car I have owned 2008-BMW 328i (Just another beamer) |
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07-01-2008, 12:06 PM
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Burn the fire.
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Quote:
After then, find where the leak is.
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[x] Working | [_] Broken: 2017 Victory Octane [x] Working | [_] Broken: 2005 Ram 1500 SLT w/5.7L Hemi "Drive it like you stole it." |
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07-01-2008, 05:29 PM
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Trying to work for parts!
Join Date: Oct 2006
Location: MO
Posts: 1,760
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If the pressure is too low....meaning missing freon, then the compressor wont turn on. Same way with every compressor, even your home ac. It's designed that way so you dont burn out the compressor.
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86 Metallic Grey 85.5 Metallic graphite - Gone |
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07-01-2008, 06:19 PM
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Join Date: Mar 2008
Posts: 474
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Great, I was told if the compressor does not turn on the clutch is bad...I am going to buy a recharge kit today and fill her up...or do you recommend bringing it to a shop ?
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1990-Porsche 944 S2 Project Hair Loss 2001-Saab 9-5 BSR Best car I have owned 2008-BMW 328i (Just another beamer) |
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07-02-2008, 02:43 AM
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Join Date: Jul 2004
Posts: 43
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Unless you have the equipment (vacuum pump and gages) and know how to use them, take it in. You might avoid damage due to over fill, moisture and air will be removed from the system. Moisture and air can really mess things up. Leaks can be checked and the proper operation of the expansion can be verified. Things like the receiver drier or expansion might need to be replaced. They are not real expensive. When done the system may work!
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07-02-2008, 05:11 AM
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2017 Victory Octane
2005 Dodge Ram 1500 SLT
