Question about 2000 GMC Sierra

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Heater no hot air

Doesn't blow hot air

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  • GMC Master
  • 14,380 Answers

Your thermostat could be staying open,not letting the coolant to get hot,or your heater core is bad,usually leaking by driver side floor board.

Posted on Nov 30, 2012

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Posted on Jan 02, 2017

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SOURCE: heater will not blow out hot air. System has been

did you change thermostat.

Posted on Jan 02, 2010

  • 6982 Answers

SOURCE: Heater does not work

Check blend door motor for proper operation (vacuum operated) if necessary, detach arm from heater box and move by hand. If you have heat then, change motor! You are reaching operating temp for engine, right? If not, thermostat is stuck open... Change.

Posted on Dec 22, 2008

OLDERQT
  • 1 Answer

SOURCE: 93 gmc sierra heater not working

THERMOSTAT REPLACE IF NOT SEE IF HOSES ARE CLOGGED SHOT OF AIR COULD HELP OR DISSCONNECT BATTERY CABLE 10-15 MIN CONNECT BACK TRY HEATER

Posted on Jan 04, 2009

badliljess
  • 83 Answers

SOURCE: My 2001 Yukon front heater

Check your heater control valves.

Posted on Jan 19, 2011

bluebirdmate
  • 1190 Answers

SOURCE: after running for 20 minutes or more , the heater

Hello: Check the coolant level, fill up the reservoir and run truck, if reservoir shows low again fill it back up. If reservoir was low/empty the check for leaks. Do this before you replace thermostat. The heater core would not create this kind of condition.

Posted on Feb 09, 2011

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