The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post

Zonaman · 08-01-2005, 07:40 PM

On the way back up to Phoenix from Tucson I noticed my A/C airflow seemed restricted and the temp from the center vent was 57 F. After turning the unit off for a while, a lot of water drained off and things were OK again. Am I correct in deducing that my evaporator froze over? If yes, I have a control knob on the thermal switch on the evaporator. It was set low enough for air from the center vent to come out near freezing. I now have it set so that lowest air temp from center vent is 44 F. (at 90 F ambient, very humid) Is there a rule of thumb for lowest vent temp you can go and still avoid freeze over?

Thanks.

PS This is an Old Air Unit.

08-01-2005, 07:40 PM	#1
Zonaman Registered User Join Date: May 2004 Location: Chandler, AZ Posts: 519	Evaporator Freeze Over? On the way back up to Phoenix from Tucson I noticed my A/C airflow seemed restricted and the temp from the center vent was 57 F. After turning the unit off for a while, a lot of water drained off and things were OK again. Am I correct in deducing that my evaporator froze over? If yes, I have a control knob on the thermal switch on the evaporator. It was set low enough for air from the center vent to come out near freezing. I now have it set so that lowest air temp from center vent is 44 F. (at 90 F ambient, very humid) Is there a rule of thumb for lowest vent temp you can go and still avoid freeze over? Thanks. PS This is an Old Air Unit. __________________ 69 C-10 LWB, 350, 700r4, 3.73 posi-traction, front disc brakes. Built for the desert- She can take the heat! Vivat Rex Chevus! Last edited by Zonaman; 08-01-2005 at 07:40 PM.