SPONSORED LINKS

When it runs with the heater on blows good hot.

Tiny
ANONYMOUS
  • MEMBER
  • 2002 GMC JIMMY
  • 109,000 MILES
When it runs with the heater on blows good hot air. If you turn fan off it will over heat and has a gauge on dash. Replaced thermostat also didn't help. Can't see any leaks and fan spins while engine off and when it is cold fan is running as soon as you start the vehicle. Any ideas?
SPONSORED LINKS
Wednesday, March 6th, 2013 AT 6:35 PM

1 Reply

Tiny
CARADIODOC
  • MECHANIC
  • 33,741 POSTS
Check the cooling fins on the radiator to see if they're corroded and crumbling away. It is not giving up the heat to the surrounding air. The heater core is doing that job when you turn the heater fan on. The clue is the radiator hoses will be hot, not cool.
SPONSORED LINKS
Was this
answer
helpful?
Yes
No
Wednesday, March 6th, 2013 AT 6:59 PM

Please login or register to post a reply.

Related Air Conditioner Not Working Content

Fix an Air Conditioning Not Working Video
VIDEO
Fix an Air Conditioning Not Working Video
Instructional repair video
Air Conditioner Not Working
GUIDE
Air Conditioner Not Working
Like any sub system in today's car a problem and be minor or a little more involved, this guide will help you find the problem and perform repairs. You can be the judge if...
VIEW MORE

Sponsored links