1993 Dodge Van Air starts to come out warm, then ice cold!

JOEINNES

MEMBER
1993 DODGE VAN
6 CYL
2WD
AUTOMATIC
17,300 MILES

Hello. When I turn on heat, it starts to blow warm air, but then it turns cold. The engine temp is normal. I do notice coolant is very rust colored.

Wednesday, January 14th, 2009 AT 7:50 AM

3 Replies

JACOBANDNICKOLAS

MECHANIC
109,706 POSTS

With the engine hot, running, and the heater on, do both heater core hoses get hot?

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Saturday, March 14th, 2009 AT 5:11 PM

JOEINNES

MEMBER
2 POSTS

I was told that one hose does NOT get hot. Is there a blockage?

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Thursday, March 26th, 2009 AT 11:48 AM

JACOBANDNICKOLAS

MECHANIC
109,706 POSTS

If only one gets hot, chances are the core is blocked inside or the heater valve is bad. Check along the hoses to see if there is a valve. Is the coolant hot to the valve then cool off? If so, chances are that is the problem. If it doesn't change, then the heater core is plugged.

If it is the valve, just replace it. If the core, you can flush it with garden hose pressure.

Let me know what you find, or you have other questions.

Joe

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Thursday, March 26th, 2009 AT 5:38 PM