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Interior heating

Tiny
ANDRES N. MOLINA
  • MEMBER
  • 1999 OLDSMOBILE BRAVADA
  • 4.3L
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 186,298 MILES
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!
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Thursday, January 11th, 2018 AT 9:40 AM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,513 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

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Friday, January 12th, 2018 AT 2:35 PM

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