SPONSORED LINKS

1993 GMC Suburban No heat

Tiny
SCOTTYMCDEE
  • MEMBER
  • 1993 GMC SUBURBAN
  • V8
  • 4WD
  • AUTOMATIC
  • 135,000 MILES
My heat stopped working both front and rear, blows cold. I replaced the correct thermostat, flushed the radiator, still no heat. Previous to replacing the thermostat, the old one registered about 150-170 degrees all day long. After replacing with a new 195, it still registers same 150-170, still, no heat.
SPONSORED LINKS
Wednesday, February 4th, 2009 AT 7:06 PM

1 Reply

Tiny
BLUELIGHTNIN6
  • MECHANIC
  • 16,542 POSTS
Hello
Thanks for the donation.

Your heater core may have gotten clogged up or failed. Find the two hoses leading to heater core through the firewall, under hood. After engine has warmed up and with heater on high setting, feel the two hoses. Both should be warm to touch at this point. If only one or neither are warm this will indicate a faulty heater core.

Let me know what you find and I will follow up.

Thanks for using 2CarPros. Com!
SPONSORED LINKS
Was this
answer
helpful?
Yes
No
Wednesday, February 4th, 2009 AT 9:55 PM

Please login or register to post a reply.

Related Heater Not Working Content

Heater Not Working
VIDEO
Heater Not Working
Instructional repair video
Heater Not Working
GUIDE
Heater Not Working
Step 1 - A heater cannot operate unless the engine is full of coolant/antifreeze. If coolant level is low check the system for leaks.
VIEW MORE

Sponsored links