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1978 Chevy (El Camino) Weirdness

newton5 on Sun April 26, 2009 3:43 AM User is offlineView users profile

Year: 1978
Make: Chevrolet
Model: El Camino
Engine Size: 350 CID
Refrigerant Type: R-12
Ambient Temp: 75-85
Pressure Low: 0
Pressure High: 0
Country of Origin: United States

Tonight I got a lesson in "you only "thought" you knew it all, sucker!". To add insult to injury, it was my daughters car. I was doing the preliminary inspection to resurrect the AC and restore the climate control system on her (newish) 78 El Camino.

I pulled the dead blower motor and saw a lot of crud inside. Then pulled the blower resistor to see 30 years of impacted schmutz on the evaporator. Well, we'll just pop the housing open and clean it.
Initially I thought it was a POA system because of the A6 compressor. Hmmm, no POA valve? It has an accumulator, so it must be a CCOT system,right?. Nope. no cycling switch on the low side.

There is a thermostat with the line strapped to the inlet tube of the evaporator, just downstream of the orifice tube and no cycling switch. I have to assume the t-stat controls compressor cycling? Is this actually a thermostatically controlled OT system? I'm confused.
Yep, it's factory installed AC.
Is there any way to test the thermostat or should I just replace it since I'm in there?

The good news is, the evap and the heater core both look perfect after cleaning and the orifice tube is clean as a whistle and oily. I'm leaning toward a new heater core, just because it appears to be a 30 YO original.
The bad news is, the condenser has a blob of tar like substance on it the size of a large dinner plate. It ain't coming clean.
Well, it couldn't have been 'THAT" easy, now could it.

Edited: Sun April 26, 2009 at 4:34 AM by newton5

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