Question about 1997 Oldsmobile Bravada

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Problem with heating up and staying heated.

My '97 Oldsmobile Bravada has a problem heating up. From the moment I start the car the heat gauge climbs all the way to the red line rather quickly. It is not overheating because it is blowing cold air. It stays in the red for a while. Just before it starts blowing hot air I hear a loud popping sound coming from under the hood. Then the gauge will fall back a little ways and blow hot air. But it does not stay like that. Then it will fall back to the red line and blow cold air. Then the popping sound again, it falls back, and blows hot air. Its a back and forth type thing. What could be the problem?

Posted by Anonymous on

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  • Oldsmobile Master
  • 2,294 Answers

Thermostat is sticking or heater core is blocked.do not keep running it or it is going to ruin the engine. It is running hot regardless if is blowing cool or hot air. Do not keep using the car.

Posted on Apr 16, 2017

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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emissionwiz
  • 76164 Answers

SOURCE: Car was overheating now the temp gage does not move off C

Try flushuing the system and replacing the thermostat first, then if the problem persists have a shop do a test for a leaky head gasket, but do the easy cheap stuff 1st, only makes sense to me, how about you?

Posted on Oct 07, 2008

  • 6 Answers

SOURCE: my AC in my 95 aurora blows out hot air.

Try either having it recharged by a pro or I believe you can go to auto zone and by the ac recharge in a can. I f that doesn't work it could be the trinary switch.

Posted on Jun 29, 2009

miket756
  • 2702 Answers

SOURCE: heating problem driver side blowing hot air passanger side blcold

its likley to be the pipe has been riped off or fell off or its the flaps on the heater box its self not opening,,,have a look under the dash to fine any pipes that are off the heater box,,
anyhow, who cears if the passanger gets cold,,, its the driver who needs to keep warm!!!!
unless its the other half? or worse still its the mother in law!!!! ho ho ho!

Posted on Nov 05, 2009

  • 1 Answer

SOURCE: new heatercore but no heat flushed system out but

2000 Oldsmobile Bravada heater blows cold air. Had a new heater core put on that isn't it,new antifreeze,

Posted on Nov 07, 2009

jturcotte
  • 8273 Answers

SOURCE: My temp gauge goes up to the hot but doesn't

Hi,

Try stopping on a steep incline--does the heater stay warm? If yes, what you have is an air bubble that hangs at the heater hose until pressure from the water pump blows thru it as the engine speeds up. Park on an incline, open the radiator cap, run the engine until the thermostat is open, turn the heater on, crack open any/all bleed ports to release any trapped air, and fill the radiator to the neck. Wait until the level stops dropping and make sure bubbles don't continue to come up. If they do, you may have a blown head gasket that will keep forming these bubbles until you change the gasket.
Please let me know if you have any questions and thanks for using FixYa.

Posted on Apr 08, 2011

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