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

1993 DODGE VAN
17,300 MILES • 6 CYL • 2WD • AUTOMATIC
Avatar
JOEINNES
  • MEMBER
  • 2 POSTS
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.
Jan 13, 2009 at 11:50 PM
Advertisement
Avatar
JACOBANDNICKOLAS
  • ✓Experienced Mechanic
  • 110,240 POSTS
With the engine hot, running, and the heater on, do both heater core hoses get hot?
Mar 14, 2009 at 10:11 AM
Avatar
JOEINNES
  • MEMBER
  • 2 POSTS
I was told that one hose does NOT get hot. Is there a blockage?
Mar 26, 2009 at 4:48 AM
Avatar
JACOBANDNICKOLAS
  • ✓Experienced Mechanic
  • 110,240 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
Mar 26, 2009 at 10:38 AM
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.
Ask a Free Question
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.