Elvin1 Posted June 6, 2011 Share Posted June 6, 2011 Why would a truck heater only blow cold air? Quote Link to comment Share on other sites More sharing options...
Underdog Posted June 6, 2011 Share Posted June 6, 2011 Why would a truck heater only blow cold air?Are the valves turned on under the hood? There should be shut off valves on the heater hoses where they attach to the engine.Also check the cable or air operated heater control valve inline on the heater hose to be sure that is moving when you move the lever in the cab. Gregg Quote Link to comment Share on other sites More sharing options...
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