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Need help with my heater

1K views 5 replies 3 participants last post by  Putch 
#1 ·
So when I turn the selector knob on to
Anything it stays on the defrost mode. Also
Have a problem when I turn the selector on my heat will only work for about 5 secounds than get cold if I turn it off and turn it back on two minutes later it's warm again 5 secound latter it gets cold.

If I'm just driving my truck eith the heat off it will slowly warm up my truck need help please truck sat for a year before I bought it. Have cleaned injectors new oil change spark plugs. Air filter
 
#2 ·
Possible vacuum leak. Mine does the same thing. Always hunting back and forth from dash/floor to defrost. Typically it's the vac tank (if I remember correctly) under the cowl by the wiper arms.
No heat, I'd have to say your heater core is plugged. Replace it. A nice easy job. Lol.
 
#4 ·
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