Interior heating

1999 OLDSMOBILE BRAVADA
186,298 MILES • 4.3L • 6 CYL • 4WD • AUTOMATIC
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ANDRES N. MOLINA
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  • 1 POST
Vehicle has new radiator and interior blower is working. I replaced a cracked vacuum hose on the exterior area under the hood, but it blows warm air for a minute then cold again. Every now and then it will blow hotter air then immediately start blowing cold air again, so I am not sure if it is heater core or what. Please can you help me with this I am freezing in Colorado? Thanks!
Jan 11, 2018 at 1:40 AM
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STRAILER
  • ✓Experienced Mechanic
  • 55,694 POSTS
Hello,

When the engine is cold can you open the radiator to see if it is full? If you have a slight blown head gasket it will fill the cooling system with exhaust making the heater not work or you could just have a small leak in the system.

Here is a guide to help us do the basic checks:

https://www.2carpros.com/articles/car-heater-not-working

Please let us know what you find. We are interested to see what it is.

Cheers, Ken

Jan 12, 2018 at 6:35 AM
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