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ac blowing hot air

randy120979 on Wed July 14, 2010 11:31 PM User is offline

Year: 2004
Make: chevy
Model: s10
Engine Size: 4c
Refrigerant Type: r134a
Country of Origin: United States

I have replaced the condenser , orifice tube,and had the unit charged with freon. compressor kicks on when you turn the the ac on so it seems to be ok. I also pulled a vacuumed on the system and it held so i am sure there is no leaks . I thought that the heater was staying on all the time so i bypassed the coil in the dash and put the inlet and return directly together that didn't work still blowing hot air. All the switches in the dash seem to be working fine and the heater works great . After all of these and 300 dollars later it still blows hot air I am runing out of ideas and money. Thank you for any kind of help that may be able to offer its getting really hot here in texas.

thank you randy

GM Tech on Thu July 15, 2010 8:27 AM User is offline

V-7 compressors on 4 cylinder S-10s are known to wear out internally when run low on refrigerant for an extended time- they starve for oil and turn black inside.--


Chances are your low side is high and your high side is low-- because of a failed compressor-- sorry- but never keep running and a/c system when you know it is not working properly-- early indicators are-- air out vent is just barely cool and not cold-- that is the time to shut er down and seek help.... I'm 90% sure your pump is trash now

Oh yeah- what provoked the condenser change?

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......

NickD on Thu July 15, 2010 9:52 AM User is offline

Playing with the heater core hoses can introduce air pockets and even cause more problems if not refilled correctly. And if you did have heater problems, would have been blend door problems. When all you had to do was to hand feel the evaporator inlet and outlet to make sure both were ice cold.

Freon is a DuPont tradename for R-12, unclear as to whether you drew a vacuum and charged yourself, or whether you had a shop do this, and as GM Tech said, post pressures. V-7's are best charged by weight. Takes skill to charge by pressures as they vary all over the place. If you had to change hoses to switch from vacuuming to charging, always a strong possibility you got air in the system, while pressures may seem to be normal or even near normal, will blow hot air.

randy120979 on Thu July 15, 2010 6:52 PM User is offline

The low side and the high side are reading 95, when the vccumie was pulled it read -29 and it held for 30 minutes. is there any way to test the compresser ? These was all started when I took my truck in to have it charged and the ac tech told me that it wouldnt take a charge that I had bad orfice tube are a bad condenser. He quote 300 hundred to fix it I couldnt affored it. So I replaced the condenser and the orfice tube my self and pulled a vaccumie on it and charged it my self . I am consider haveing a shop try to charge it and see if that will work . Thanks for the help GM tech and NickD,

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