2005 Pontiac Grand Prix Blows Cold air

2005 PONTIAC GRAND PRIX
78,000 MILES • V8 • 2WD • AUTOMATIC
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TAYANTA1
  • MEMBER
  • 1 POST
This morning the car never seemed to warm up - in a 12 mile commute the air wouild seem to start get warm and then go to cold again. The temp gauge looked like it was going to over heat.
Dec 14, 2009 at 3:27 PM
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MMPRINCE4000
  • ✓ASE Certified Mechanic
  • 8,548 POSTS
  • ASE Certified Mechanic
With engine at operating temp, quickly touch the upper and lower heater core hoses. If one is hot and the other is warm, then heater core is blocked.

Also make sure coolant level is at full mark and no leaks.

Another possibility is diverter valve.
Dec 16, 2009 at 6:25 AM
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