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97 Camaro bows cool at idle, dont cycle comp. cycles on HWY though?

PCWeber on Sun May 20, 2012 9:31 AM User is offline

Year: 97
Make: Chevy
Model: Camaro
Engine Size: 3.8L
Refrigerant Type: 134a
Ambient Temp: 82
Pressure Low: 40
Pressure High: 250-275
Country of Origin: United States

97 camaro. It blows constant 45 degrees at idle, never cycles at 83 degrees ambient temp yesterday. I drive on highway the comressor kicks off after 2 miles for about 10 seconds, then back on, etc and keeps cycling. Acts like high side cut off. I always assumed with more airflow (highway speeds) the high side presure goes down so I can see how the high side could be kicking it out. But how can you tell as I cant have gauged hooked up on highway....


Edited: Sun May 20, 2012 at 9:39 AM by PCWeber

GM Tech on Sun May 20, 2012 1:38 PM User is offline

Your Caamaro uses a V-5 compressor- should not cycle by design--if it truly is- then it has to be because of high pressure spikes---try running with a gage set on it- what does the high side do? Look for restricted air flow- do you have walmart plastic bags sucked up into front of condenser? seen that before--those "F" cars are vacuum cleaners

-------------------------
The number one A/C diagnostic tool there is- is to know how much refrigerant is in the system- this can only be done by recovering and weighing the refrigerant!!
Just a thought.... 65% of A/C failures in my 3200 car diagnostic database (GM vehicles) are due to loss of refrigerant due to a leak......

JJM on Sun May 20, 2012 1:41 PM User is offline

Why not? Just duct tape the gauge set to the windshield.

Compressor should be cycling at all, since the 3.8L uses the V5 compressor, so I would check for high pressure cut-out... unless of course the A/C system was modified on the vehicle.

Not sure if the Camaro uses an OT or expansion block. What does yours have?

Joe

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PCWeber on Sun May 20, 2012 5:39 PM User is offline

I will get the gauges on and have my 6'5" son reach out the window and hold them later today. The other issue is not having long enough hoses.

GM Tech on Sun May 20, 2012 5:45 PM User is offline

Should be an OT, switched back to OT when they went to variable compressors-- the fixed displacement H-6s of 93-96 vintage used an H block TXV at evap entrance underhod...

-------------------------
The number one A/C diagnostic tool there is- is to know how much refrigerant is in the system- this can only be done by recovering and weighing the refrigerant!!
Just a thought.... 65% of A/C failures in my 3200 car diagnostic database (GM vehicles) are due to loss of refrigerant due to a leak......

PCWeber on Mon May 21, 2012 7:09 AM User is offline

So are you saying I should track down the OT and check/ clean screen? Any idea where it is on a 97?

GM Tech on Mon May 21, 2012 10:38 AM User is offline

Look for expanded section on 3/8 liquid line as it prepares to enter evaporator case-- there are also two dimples that serve as stops so OT doesn't flow into evap as well.- there will be a screw on connection right in front of expanded section - known as the OT connection- discharge system and open this connection if you feel you need to see the OT inlet screen.

-------------------------
The number one A/C diagnostic tool there is- is to know how much refrigerant is in the system- this can only be done by recovering and weighing the refrigerant!!
Just a thought.... 65% of A/C failures in my 3200 car diagnostic database (GM vehicles) are due to loss of refrigerant due to a leak......

PCWeber on Thu May 24, 2012 5:10 PM User is offline

Got some more info today as it was finally warm again. SO I taped the gauges to the windshield so I could see pressure while driving. Again, I can let it idle for 20 mins and the temp out vents are cold 45ish and pressure steady at 40ish & 225ish. So, I drive. It climbs to around 250 on high side and stays steady for about 1.5 miles. Low side stays between 35-40 the whole time. (as long as comp. In engaged). All of the sudden after mile 2 the high side starts climbing fast. Swings all the way over to 500, comp kicks out, drops pressure, comp kicks on, then a vicious cycle of high pressure, cut off, etc. back and forth. I stop, let it idle and it all settles out and cools. Is the roll of the TXV to prevent this high side rise? Also, I went home and made a jumper one time that stuck the fans on high. That made my idling high side lower at around 200psi but when I drove it the same spike issues happened. I am stumped. Unless movement is creating some weird lack of new air situation under the front of the car as these Camaros rely 100% on sucking in air from below.

GM Tech on Thu May 24, 2012 6:58 PM User is offline

As I stated before- you should have an orifice tube-not a TXV-- you definitely are experiencing high pressure cut-outs-- either you are overcharged- have air in the system from not pulling a vacuum before charging- or you have air flow issues across condenser- did you look for plastic bags sucked up there- how about tree/bush fluff? is it clean up there? are you cooling fans sucking air in- running the proper direction?- seen it before...look for anything abnormal in air flow issues-- has anyone changed the condenser lately- perhaps plumbed it wrong- or put it in upside down and backwards-- seen that on a 92 camaro once...body shop actually painted the front of it black to match the rear..

-------------------------
The number one A/C diagnostic tool there is- is to know how much refrigerant is in the system- this can only be done by recovering and weighing the refrigerant!!
Just a thought.... 65% of A/C failures in my 3200 car diagnostic database (GM vehicles) are due to loss of refrigerant due to a leak......

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