Why is my A/C blowing warm air - The 1947 - Present Chevrolet & GMC Truck Message Board Network

smorg007 · 08-19-2011, 08:19 PM

I had the whole system gone through last summer and it worked great in our triple digit climate. Now it blows warm air. You can see by the pics that the lower tube ice's up instantly when I turn it on. I checked and replaced one vacuum line and reconfirmed heater core shut-off valve was functioning properly, baffle rod inside core housing that diverts the air moves with cable. Any ideas is appreciated.

JimKshortstep4x4 · 08-19-2011, 08:32 PM

Have you checked the pressures in the system?

It looks like in the picture that the freon is not flowing through the evaporator since the outgoing line is not frosted.

Is that a hose clamp on the refrigerant line? If it is and you are using 134A then it is possible that you have a leak and not much refrigerant is in the system.

Jim

umwtnt · 08-19-2011, 08:33 PM

Normally thats a sign of low refrigerant. Install the gauges and check your pressures.

lil hoodlum · 08-19-2011, 09:40 PM

Quote:

Originally Posted by umwtnt

Normally thats a sign of low refrigerant. Install the gauges and check your pressures.

I agree, it appears that you are low on freon. You probably have a leak.

Good luck,

Keith

**a1vintage69** · 10-24-2016, 10:14 AM

Quote:

Originally Posted by smorg007

I had the whole system gone through last summer and it worked great in our triple digit climate. Now it blows warm air. You can see by the pics that the lower tube ice's up instantly when I turn it on. I checked and replaced one vacuum line and reconfirmed heater core shut-off valve was functioning properly, baffle rod inside core housing that diverts the air moves with cable. Any ideas is appreciated.

Stan, you haven't been on here in awhile. I used to see ya at the shows. do you still have your truck? anyways I am looking for lower nos wood grain trim. did you sell all you had? or any other c10 parts. please let me know. Steve Jones in Redding . June Jones' son. I will send a pm.Thanks

08-19-2011, 08:19 PM	#1
smorg007 Registered User Join Date: May 2010 Location: Redding, Ca Posts: 371	Why is my A/C blowing warm air I had the whole system gone through last summer and it worked great in our triple digit climate. Now it blows warm air. You can see by the pics that the lower tube ice's up instantly when I turn it on. I checked and replaced one vacuum line and reconfirmed heater core shut-off valve was functioning properly, baffle rod inside core housing that diverts the air moves with cable. Any ideas is appreciated. Attached Images

08-19-2011, 08:32 PM	#2
JimKshortstep4x4 Senior Member Join Date: Jul 2001 Location: Muskegon,MI,USA Posts: 6,026	Re: Why is my A/C blowing warm air Have you checked the pressures in the system? It looks like in the picture that the freon is not flowing through the evaporator since the outgoing line is not frosted. Is that a hose clamp on the refrigerant line? If it is and you are using 134A then it is possible that you have a leak and not much refrigerant is in the system. Jim __________________ 1971 Shortbox step side 4x4, 350 sbc, 3:07 rear end 1965 Impala SS 400 sbc, Muncie rock crusher 1966 Impala SS 396 bbc, TH 400 1969 El Camino, 350 sbc, TH 350 1971 Snowplow built on a Blazer frame 1972 GMC Short bed, stepside, TH 400, 427 BBC

08-19-2011, 08:33 PM	#3
umwtnt Registered User Join Date: Feb 2008 Location: Williamsburg, Va Posts: 226	Re: Why is my A/C blowing warm air Normally thats a sign of low refrigerant. Install the gauges and check your pressures. __________________ The more I learn, the more I find out I don't know. 69 Chevy SWB w/67 front end 4 wheel discs 468 BB 700R4 Bagged Coming around slowly



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