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If I turn on the heat the thermostat rises and the check gauges comes on

Tiny
MARIA MONTOYA TAYLOR
  • MEMBER
  • 2001 CHEVROLET TRAILBLAZER
  • 4WD
  • AUTOMATIC
  • 10,768 MILES
When I turn on the heat the thermostat rises and the check gauges comes on. No heat comes out by my feet or to defrost. Temperature rises within seconds. The air conditioner works fine. As soon as I turn the heat off and turn down temperature sometimes to air conditioner the temperature drops back to normal and the check gauges goes off. Immediately.
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Thursday, October 6th, 2016 AT 6:12 PM

3 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Check coolant level first if low then fill it see if that takes care of it. Then check for an internal leak like a head gasket.
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Friday, October 7th, 2016 AT 7:15 AM
Tiny
MARIA MONTOYA TAYLOR
  • MEMBER
  • 2 POSTS
Thank you. Now my coolant saays check while hot. Many other people say check when cool. Which is best. I did both when I checked it cool it looker way low. When I checked hot it was about a quarter from the top
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Saturday, October 8th, 2016 AT 11:16 AM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Always check when cool and add to fill line have your coolant system checked for a head gasket too.
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Saturday, October 8th, 2016 AT 11:35 AM

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