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accumulator very cold but not duct temp

Turbo on Sat July 11, 2009 4:30 PM User is offline

Year: 1987
Make: chevy
Model: monte carlo
Engine Size: 5.0
Refrigerant Type: 134a
Ambient Temp: 75
Pressure Low: 30
Pressure High: 180
Country of Origin: United States

I just finished a complete retrofit on a 1987 Chevy Monte Carlo. The lines in to and out of the evaporator are ice cold and sweating. The Accumulator is also ice cold with condensation. The problem is the vent temp is only 60 degrees F. I also have the hot water lines pinched off so I know it is not the heater causing this. The blower fan is running on high but the vents don't seem to blow very hard. I know these cars never had good blowing vents but it seems to be even less than normal. Where should I look next?

Chick on Sat July 11, 2009 7:12 PM User is offlineView users profile

Blend doors and the face of the evap for dirt and oil clogging which will affect the airflow.. Air may be blowing around it..??

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Chick
Email: Chick

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Freedoms just another word for nothing left to lose

Turbo on Sun July 12, 2009 7:56 PM User is offline

Thank you Chick. Pulled the blower motor out and cleaned the face of the evaporator. It was pretty clean. Still the same problem. I will have to look futher in to the doors another day. Thank you for the info.

Chick on Sun July 12, 2009 10:38 PM User is offlineView users profile

your pressures are fine for that ambient, so your problem is going to be air diverters or something like that, let us know what you find though...

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Chick
Email: Chick

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Freedoms just another word for nothing left to lose

2005Equinox on Tue July 14, 2009 1:41 AM User is offline

Are you sure the system isnt freezing up? I had that same problem with the 1985 Caprice and it turns out there is an adjustable cycling switch. It is in the wire that hooks to the accumulator. I agree there doesnt seem to be a huge amount of airflow in the Caprice either. A person could try running the system on Vent in a cool place and see if the air outflow is nearly the same temperature as the outside air. Rule out heat making its way in somewhere. Does it cool better when you are driving or sitting. The Caprice has a little issue where it cools well when moving but if you sit at a stoplight for a while or in a parking lot it doesnt cool near as well. Check your thermostatic fan and make sure that is kicking in when its supposed to. The clutches on these go frequently. Good luck.

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2008 Chevrolet Impala LS
1981 Pontiac Bonneville


2007 Sears Craftsman Lawn Tractor


1985 Chevrolet Caprice


1986 John Deere 165 lawn tractor

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