No Heat

5

Asked by Jan 31, 2017 at 05:26 AM about the 1972 Chevrolet El Camino Base

Question type: General

My 1972 el camino wont blow heat, everything been replace all is brand new including new ac/heater box under dash. new core, new control panel, blower motor all controls working fine but still no heat, my heater hoses stay luke warm never hot even with temp up to 190 degrees, cant figure this out have done everything but still no heater. Stumped!

9 Answers

108,115

I had a 62 vette that did the same thing, everything was changed and no heat, it turned out to be the blower motor was not spinning fast enough and was weak, you may want to look at this...

1 of 1 people found this helpful.
73,065

You need to purge the air out of the cooling system. To do this have the radiator cap off and the heater setting on hot. Start the vehicle and let it warm up to operating temp. when the thermostat opens. You can feel it in the top radiator hose when it opens. During this time coolant may be pushed out the top of the radiator, this is normal as that is the air pockets working there way out. Have at least an extra gallon of coolant handy. When the thermostat opens the coolant level will drop in the radiator. Add more coolant at this time. Let it run and repeat the process several times until your satisfied the cooling system is full. Put the radiator cap back on when the engine is running. Done...While doing this DO NOT REV THE MOTOR, with the radiator cap off, or you will get a shower!.

1 of 1 people found this helpful.
73,065

Good Morning COMETGUY61.

5

Thanks for your help, I've purged it 3 times and blower motor is new, blowing hard but still no heat and blend door is working, Damn thing lol been building small block chevy's for 45 years and first time problem go figure! heater hoses are luke warm not hot

73,065

What shape is the radiator in? Does the top radiator hose get hot, and stay hot when the thermostat opens up?

1 of 1 people found this helpful.
108,115

Good morning Rowe !

108,115

Do me a favor, can the fan be disconnected ? if so What if you are cooling the anti-freeze to much and its not able to get up to temp...

1 of 1 people found this helpful.
50,765

Is it possible that the heater hose supply fitting(s) at the engine are partially corroded shut?

1 of 1 people found this helpful.
5

Thanks everyone Great ideas, still working on it i'll let you know the outcome.

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