whenever I turn on the heat or defrost on my truck, the temperature goes up, and gets hot usually within about 10 minutes, hot enough so I have to turn it down. It also goes up at an idle. It was losing coolant, and I added some stop leak which helped, but it still overheats.

The truck is an 89 toyota with a 22re 4cyl. and 5-spd. could this be a bad thermostat? Thanks for any help you can give me.

11/29/2005 4:45:10 AM

You could try to bleed the system, but I'm having a hard time following your description of the problem.

11/29/2005 4:48:54 AM

heater core leaking? blockage or air bubble in it?

11/29/2005 1:48:55 PM

thanks bigblue, I'll check it out.

11/29/2005 1:57:14 PM

So does it not overheat at all unless you run the heat or defrost?

11/29/2005 3:09:40 PM

^ right.

11/29/2005 4:04:32 PM

have you checked your coolant level? dumb question, but worth asking, or found the leak?

12/1/2005 11:17:29 AM

Doesn't running the heat usually make the car run cooler though?

12/1/2005 2:26:35 PM

^If everything is functioning as it should, yes.

12/1/2005 2:59:09 PM

I'm having a hard time following your description of the problem.

[Edited on December 1, 2005 at 8:36 PM. Reason : lol]

12/1/2005 8:36:08 PM