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2001 mountaineer (explorer) Heat help


New Member
December 16, 2008
Reaction score
City, State
San Antonio, TX
Year, Model & Trim Level
98 Eddie Bauer Explorer
My monster-in-law has a 2001 mountaineer that is immaculate and she is having some heat problems I need help diagnosing. The climate control heat functions perfectly for about 25 mins driving down the road and then all of a sudden it will start blowing cold air instead of hot. The 25 mins is an estimate but around 20-30 mins it will start blowing cold. The blend door seems to be fine I checked it switching it from hot to cold and in between. Anybody else experienced this. Where can I start to look oh and it is not throwing any dummy lights or none that I can see.

Thanks a lot guys,