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View Full Version : Heat issues in '99 Caravan



Anonymous_User
01-18-2007, 03:36 PM
'99 Grand Caravan. At highway speeds, or with RPM above 2k, I get decent heat. At lower engine speeds, the hot air becomes warm air, becomes cool air.

Sounds like low coolant, right? Nope. Coolant level is topped off and hasn't budged.

So, I figure its either:

1.) Weak waterpump (kinda hope this is it)

2.) Plugged heater core (uggg)

I'll throw a new t-stat in before I start on anything else, but engine temp gauge is steady.

Questions: Would either of these items cause this problem? How hard is the heater core to change on this vehicle? After the t-stat, what troubleshooting steps should I take to locate the problem?

JDAWG
01-18-2007, 04:03 PM
Tstat would be my first guess, is it manual controls or auto temp control?

turbovanmanČ
01-18-2007, 05:06 PM
Thermostat would be my first guess.

What engine?

88_pacifica
01-18-2007, 05:09 PM
+2 to the thermostat... or, it could be an overall "gunked up" cooling system. That's exactly what the symptoms you're describing sounds like...

Anonymous_User
01-19-2007, 01:00 PM
Good, I hope it is a T-stat. I'll find out this weekend. Too damn cold to try working in the shop a few hours after work. :(

It's a '99 Grand, so that has the 3.3, right? Hell, I don't know. Too damn cold to pop the hood and look. :(

Manual controls.