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My air works, then it does not work, then it does

idrd on Thu June 10, 2010 10:50 PM User is offline

Year: 1996
Make: Chevy
Model: S10 Blazer
Engine Size: 4.3
Refrigerant Type: R134

No where has as much Knowledge I have found as on here when it comes to AC for your auto. Hopped on last year and ended up going down to AZ Air to buy Evap, Dryer and New compressor for my truck and my wifes car. People were great, service was great, the whole place was great. I have recomended them at least 2 dozen times.

Put everything in last June and up until about a month ago, all was good. Now, for the last few weeks, will start the truck up ( I leave the AC switch on when I park the car at night, do not bother turning it off this time of year) The air works great, blows nice and cold. Problem is the last few weeks , if I stop for any reason, store, coffee etc and shut the truck off, when I come back out, its blowing nothing but hot air. I checked, the compressor is not turning. Now, this does not happen all the time mind you. Today for instance, shut the truck off at least four times, went to Circle K, Checker, Safeway and when I turned it back on, the air was working fine. Went to QT later in the day, shut it off, came out and turned it on, truck was blowing hot air again. Came home, let the truck sit for about 4 hours, just used it and as usual, the air is now working fine. I did not buy a new pressure switch for the back of the compressor as I was told they rarely go bad. Do not remember if I bought a new pressure switch for the dryer or not, will have to check my receipt.

As I said, no way shape or form am I even close to being as knowledgeable as most on here. Any suggestions as to what is causing this ? Thanks for any help I can get. Have not worked in over 10 months so its not like I have the coin to bet a complete check up done on it. If I had the money, I would gladly bring it down. Thanks again guys.

Chick on Thu June 10, 2010 11:08 PM User is offlineView users profile

two possibility as I see it, either a faulty cycling switch or a clutch gap issue, the first and most common is the clutch gap, when it's not working tap the clutch inwards and if it grabs, you need to set the clutch, if that doesn't work, jump the cycling switch, if that starts the compressor, change it...hope this helps..

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Chick
Email: Chick

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Freedoms just another word for nothing left to lose

GM Tech on Thu June 10, 2010 11:10 PM User is offline

Next time it is off when it should be on-- open hood and tap on front of clutch with hammer handle-- see if clutch pulls in-- if it does, check your air gap- should be .020" if yours is worn- it is probably .060" or more--seen it nimerous times on high mileage vehicles--coils can pull in clutches better when metal is cold-- once warmed up, it takes more electrical field to pull it in-- sounds pretty much like what you are experiencing

If above test is positive, then you can adjust the air gap, by borrowing the clutchc tool from Autozone...

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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......

idrd on Fri June 11, 2010 12:00 AM User is offline

Thanks guys, will try tapping the front of the clutch next time it happens. Is this common ? The compressor is new and less then a year old. Got it down there at AZ Air. Thanks for the help

idrd on Fri June 11, 2010 12:22 AM User is offline

Chick, one more question. I just looked at the parts list on Arizona Air and there is not specific listing for a ' cycling switch " Lots of various pressure switches. Which would be the cycling switch ? Once I find it, I can test it. Thanks again.

idrd on Mon June 21, 2010 6:47 PM User is offline

Found the problem. Its the electrical connection on the cycle switch, was full of crud. We pressed the clutch in with the end of a hammer and nothing happened. When we moved the electrical connection around, the compressor came on. Did this several times. Cleaned the fitting up and it worked fine. Does AZ Air sell this electrical connection and may as well get the cycling swith also. Thanks.

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