Heat Blowing but not Hot Air; Warm then Cool; 78 450SL

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Heat Blowing but not Hot Air; Warm then Cool; 78 450SL

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03-19-2011, 10:45 PM

jnanasakti jnanasakti is offline

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Join Date: Dec 2006

Location: Chicago, IL

Posts: 49

Heat Blowing but not Hot Air; Warm then Cool; 78 450SL

The heat used to work fine on my car, then it stopped blowing hot air.

I replaced one vacuum check valve, but don't see anything eelse obvious.

Any ideas based on Warm air then cooler on the DEF position?

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