Join Date: Dec 2013
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My heater does not always blow hot. For instance monday i started the truck heater worked great, and it continues to work unless i shut the heater off. If it stays off for a few minutes it will blow cold unless i rev the engine to 3,000 rpms. Can rev it in neutral or when accelerating. After I rev it once the heater works perfect. Tuesday I started the truck and heater blew cold, revved the engine once and heater worked 200 miles to my destination.
For all the above instances I wait to make sure the engine is warm.
Any help would be greatly appreciated.