AC weirdness
05-30-2011, 04:45 PM
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AC weirdness So car starts up, put AC on Max, blows hot air only for 10-12 minutes. All of a sudden, ice cold air! More than I can stand. Shop where I had it dynoed checked levels said "slightly overfilled, adjusted and it worked fine. That was Friday. I have to say I've never seen this in an ac unit in my life. Car is 2006 LS2 with 5 K miles, maggie, harmonic balancer, in tank fuel pump, headers and resonators. Someone said "it's the condenser, but seems I wouldn't get ANY cold air if that was broken. Oh, also changed car thermostat to 160, don't think that should make a difference.
05-30-2011, 07:42 PM
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Maybe a pressure sensor. Its Bern awhile since I've worked on auto a/c's but the compressor turns on and off via the low a high pressure sensors. Mayne one is sticky.
05-31-2011, 06:31 AM
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probably a bad pressure switch... we have some 05 HD2500 service trucks at work and they both have had the high pressure switch changed... apparently it's a common problem
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05-31-2011, 02:41 PM
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called tech who worked on it today, he said "it might still be slightly overcharged(that's how we found it) also made mention of same sensors. I just timed the SOB EXACTLY 1/2 hour for compressor to kick in??? I REFUSE to drive a non AC car in New England in the summer, looks like Camry back on the road. OH, I started that one and had IMMEDIATE cold air? Well, guess some one will figure it out at $105/hr.
05-31-2011, 02:51 PM
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too F.....g hot in this Cadillac! Thank you SUH, this will be dually reported Thursday morning. Switch can be changed without purchase of entire new compressor unit? New units go for around $360 or so, not incuding labor
06-01-2011, 09:49 PM
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Can you verify that your compressor clutch is NOT engaging during that 30 minutes? If you are overcharged and at high temps, your high pressure switch should be signaling your compressor clutch to disengage, it would then have to reset in order for your clutch to re-engage on the low pressure switch. I only have the schematic for 04-05's so i'm not sure exactly how your LS2 is. Go to your local auto zone, or such and get a 10 dollar gauge that you can hook up to your low pressure side. While the car is running and AC to ON, you should read your pressure indications. Most have dummy colors... RED YELLOW and GREEN. Might save you a couple hundred.
06-02-2011, 08:04 PM
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-T- can u email me that schematic? Bigirishls6@yahoo.com
See post 2
https://ls1tech.com/forums/cadillac-...schematic.html
still smells old haha
06-02-2011, 09:48 PM
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I used an Ozium product on one of my old trucks. Evidently the previous owner loved to ride down dirt roads with the windows down or something because there was tons of crap in the duct work. Everytime the a/c or heat was turned on it smelled horrible. I did two treatments of fogging the inside using the external return and it cleaned it up pretty good.
06-03-2011, 07:45 AM
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Shop spennt 4 hours yesterday, tried all kinds of tricks-nothing. Finally got compressor to engage, then disengaged for 1/2 hour, then re engaged as soon as I hit my driveway 50 miles away! They have wiring diagram, calling it "bizarre." Supposed to borrow some $4000 evacuation tool next week, see what happens. We had tornado in Mass yesterday. I was parked under a large tree, moved car to clear area, ONLY one at the whole place to get hail damage! How's that for luck?
06-04-2011, 06:12 PM
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Can you verify that your compressor clutch is NOT engaging during that 30 minutes? If you are overcharged and at high temps, your high pressure switch should be signaling your compressor clutch to disengage, it would then have to reset in order for your clutch to re-engage on the low pressure switch. I only have the schematic for 04-05's so i'm not sure exactly how your LS2 is. Go to your local auto zone, or such and get a 10 dollar gauge that you can hook up to your low pressure side. While the car is running and AC to ON, you should read your pressure indications. Most have dummy colors... RED YELLOW and GREEN. Might save you a couple hundred.