No heat
70

Asked by Delores Feb 20, 2019 at 01:16 PM about the 1992 Chevrolet C/K 1500 Extended Cab RWD

Question type: Maintenance & Repair

When heater is on it blows cold air.  What would cause this?

2 Answers

Charlie answered 5 years ago

I had the same problem and fixed it finally today. The hot water inlet hose coming from the engine's intake manifold is connected with a "quick connect" fitting. The hole that carries water through that fitting is quite small. Maybe 1/4 inch. On my truck, debris (old gasket material, etc.) was carried to the fitting and stuck there. Blocking water from flowing through the heater core. I replaced the fitting with a Edelbrock 8184, which eliminates that odd quick-connect and associated special hose, and provides a nice larger 1/2 inch passage for water. Now the heater core outlet hose going to the radiator gets hot and my cab gets hot.

Mark helpful

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