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Not getting up to temperature

Tiny
DAVIDMKINCADE
  • MEMBER
  • 2000 CHEVROLET SILVERADO
  • 5.3L
  • V8
  • 2WD
  • AUTOMATIC
  • 175,000 MILES
Truck having a hard time getting to temperature only getting to about 170 heat blows lukewarm air. Once in a while my coolant light comes on and I add about maybe a cup of antifreeze.
Wednesday, October 25th, 2017 AT 3:12 AM

13 Replies

Tiny
PATENTED_REPAIR_PRO
  • MECHANIC
  • 1,853 POSTS
Has someone removed your thermostat?
If not, have you tried a new thermostat?
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+1
Wednesday, October 25th, 2017 AT 7:43 AM
Tiny
DAVIDMKINCADE
  • MEMBER
  • 8 POSTS
Not sure if it has been removed. I will try and install a new one this weekend. Thanks for the quick reply. Will let you know next week.
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Wednesday, October 25th, 2017 AT 8:53 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,347 POSTS
Here is a guide to help you see what you are in for when doing the job:

https://www.2carpros.com/articles/replace-thermostat

and

https://www.2carpros.com/articles/car-is-leaking-coolant

Please let us know what happens.

Cheers, Ken
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Wednesday, October 25th, 2017 AT 8:13 PM
Tiny
DAVIDMKINCADE
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  • 8 POSTS
Thank you this should help a lot.
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Friday, October 27th, 2017 AT 1:51 PM
Tiny
DAVIDMKINCADE
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  • 8 POSTS
Ok got new thermostat in getting up to temp but still blowing Luke warm air. Any suggestions?
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Sunday, November 5th, 2017 AT 10:18 AM
Tiny
PATENTED_REPAIR_PRO
  • MECHANIC
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Feel both heater hoses going into the firewall under the hood to the heater core, they should both be hot once the engine is up to temp, if one is hot and the other luke warm, then your heater core is clogged. If so, you could try a backflush before having to replace the heater core.
If both hoses are just luke warm, check to see if there is a heater control valve on either heater hose that might be stuck closed, so if it has a heater control valve, check both the heater hose before and after that valve, they should both be hot.
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Sunday, November 5th, 2017 AT 11:12 AM
Tiny
DAVIDMKINCADE
  • MEMBER
  • 8 POSTS
I've been playing around and found that the temp does not change when moving from cold to hot. Found blend door motor and it moves maybe a 1/8 of an in when moving dial
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Sunday, November 5th, 2017 AT 11:22 AM
Tiny
PATENTED_REPAIR_PRO
  • MECHANIC
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That has got to be the problem then. I suspect both heater hoses were hot then.
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Sunday, November 5th, 2017 AT 12:10 PM
Tiny
DAVIDMKINCADE
  • MEMBER
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Yes they were.
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Sunday, November 5th, 2017 AT 12:12 PM
Tiny
PATENTED_REPAIR_PRO
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I think you found the problem.
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Sunday, November 5th, 2017 AT 12:17 PM
Tiny
DAVIDMKINCADE
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Thanks to everyone for the help
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Sunday, November 5th, 2017 AT 1:16 PM
Tiny
PATENTED_REPAIR_PRO
  • MECHANIC
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You are welcome.
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Sunday, November 5th, 2017 AT 1:22 PM

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