Questions and Answers

Chevy Truck Heater Q. My heater does not get hot. The line going into the heater core is hot from the engine but cold on the return line to the radiator. Is there a switch that opens this up are could it be stopped up?

A. Chevy usually has a heater control valve mounted on the right rear corner of the intake manifold, the corner near the heater core. This turns on and off the flow to the heater core. there is a cable attached to it to help figuring out where it is. Usually this goes bad and won't open to allow hot coolant to the heater core. It's easily replaced and not expensive.

There is also the possibility that the heater core itself is clogged, either due to rust and corrosion or excessive use of stop leak.

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