Coupe GT A/C Isssues

[sdewitt at stx.rr.com]

Sounds like you got some loose wires somewhere.

----- Original Message -----
From: David <duandcc_forums at cox.net>
Date: Tuesday, July 19, 2005 7:51 am
Subject: Coupe GT A/C Isssues

> First, let me say that I refilled the AC last Thursday. It was low 
> causing the compressor to cycle very frequently. I only have a low 
> side guage, so I really don't know what the pressures for the high 
> side look like, but the low side pressure seemed OK after filling 
> and vent temps were nice and cold, temps drop down to about 34.5*F 
> then the compressor kicks out, then raise to about 37*F then it 
> kicks back in. 
> 
> OK, yesterday was about the hottest day of the year. It was the 
> upper 90s here with heat indexes above 110*F.  I was out for lunch 
> and the AC was rockin, vent temps below 40*F even on a #3 blow. 
> Stop at Sonic, eat lunch while it's idling witht he AC on...vent 
> temps are exactly where they should be. Drive on to 7-11. Turn off 
> car go in and grab smokes. Come out...start car...and no AC. Drive 
> to the hsoue (3 blocks) and begin to troubleshoot (in a suit & tie 
> no less). Compressor is not kicking in at all. System was just 
> refilled last week, so it is unlikely it is just totally out of 
> refridgerant. I checked every fuse and relay that had anything to 
> do with AC. I even swapped the AC relay with another one (same 
> rating/kind). No luck. Checkded the flapper valve on the airbox, 
> opening closing slowly. I hear a sucking sound from around the ISV 
> and discover a split in the lower hose. But that shouldn't have 
> anything to do with AC, right? Car is somewhat hard to start due to 
> vacuum le
> ak, and idle hunts once engine is in closed loop. All this is 
> expected behavior given the 1.5" split in the ISV hose. Can't find 
> the problem. At this point I'm hot, sweaty and pissed...I pack up 
> and leave. Just outide my driveay I romp on the gas and rev her up 
> to the redline (or close to it) in frustration & anger...guess 
> what? The AC kicks in. Vent temps plumit downto 50*F rapidly and 
> eventually hit 40*F on the drive back to work. Just for shits & 
> giggles, I turn off the AC for a second and hit the switch to turn 
> it back on...NO AC AGAIN! But ut worked fine on the drive home and 
> worked fine this morning on the drive to work. WTF? Thoughts? Would 
> a vacuum leak have anything to do with this? Or my recent refill?
> 
> Dave 
> 1987 CGT 2.3
> SE VA
> 
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