SPONSORED LINKS

Heater not working properly in cold weather

Tiny
JR47
  • MEMBER
  • 1999 PONTIAC GRAND PRIX
  • 3.8L
  • V6
  • 2WD
  • AUTOMATIC
  • 287,103 MILES
The car provides some heat but it's not enough in very low/cold temperatures. The car doesn't overheat or have any coolant leaks. I do have a low coolant light that pops on and off almost daily that's been narrowed down to being a bad coolant level sensor just haven't got around to changing it yet. Personally, I don't mind it but would like it to work properly when I have others in the car with me.
SPONSORED LINKS
Sunday, February 20th, 2022 AT 4:58 AM

1 Reply

Tiny
SQM
  • MECHANIC
  • 6,383 POSTS
Hello,

This could be due to a stuck open thermostat.
If the thermostat fails in stuck open position, it will not allow the engine to reach operating temperature. Which will lead to the heater not being able to blow warm/hot air due to the coolant being lower than idea temperature.

Usually this will be noticeable on the temperature gauge, as it will not reach the operating temperature range on the gauge.
The operating temperature for this engine is 188F to 206F. So, if the engine is not reaching that temperature, it could be due to a stuck open thermostat.

https://www.2carpros.com/articles/how-an-engine-thermostat-works
https://www.2carpros.com/articles/replace-thermostat

I have attached diagrams for your reference.

Please let me know if you have any questions.
Thank you.
Images (Click to make bigger)
Thumb
Thumb
Thumb
Thumb
SPONSORED LINKS
Was this
answer
helpful?
Yes
No
Sunday, February 20th, 2022 AT 7:45 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