2005 Pontiac Grand Prix

Tiny
TAW
  • MEMBER
  • 2005 PONTIAC GRAND PRIX
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 60,000 MILES
My heater is blowing leukwarm air and I would like to know how to diagnose if the heater isn't working properly. What do I check for. Thank you
Monday, December 31st, 2007 AT 1:19 PM

1 Reply

Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
Try warming the Vehicle, then carefully feel the heater hoses, are they both hot? If one is cooler than the other, You need to flush the core, or do a replacement job on the heater core. Also if the system has a heat control valve on the heater hose, make sure it is working! Also check the thermostat, and the temperature blend door, thats under the dash, in the heater plenum. One last thing, make sure the system is full.
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Monday, December 31st, 2007 AT 1:51 PM

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