Question about 1997 Oldsmobile Bravada

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My heater only works once in awhile

It was working fine and then my tempeture gauge went up real high and so I went to an auto supply place and they put some anti freeze in because they said it was low and now my heater only blows warm heat some of the time?

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  • 2,395 Answers

Suspect the most likely problem is air in the system, it needs to be "burped".
Whenever the temperature gauge goes way up, the coolant probably boiled out, and outside air replaced it.
When the radiator gets low, outside air will enter the vacuum created by the missing coolant.
Adding coolant is fine, but there is likely air trapped in the heater. The way to add coolant is to have the engine running with the heater on full blast, and the engine running at medium speed ( about 1,500 RPM). When you do this, the water pump will pump the air out of the heater. Add coolant slowly, and watch the system for about 5 minutes until there are no more air bubbles.
I'd be remiss not to ask you to find out why the temperature gauge went up. That overheating can destroy an engine. I would recommend you check the coolant ( WITH THE ENGINE OFF AND COLD) daily for awhile to see if there is a leak causing your problem.
The auto supply place might even be willing to put a pressure tester on the radiator for free to see if there are any leaks anywhere.

Posted on Jan 05, 2013


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Posted on Jan 02, 2017

  • 1 Answer

SOURCE: tempeture gauge

Just fixed this problem myself.

In addition to the above description, my service engine light came on about a week after the gauge stopped working.

Took it to Auto Zone and had them do an error code scan, this is a free service of AutoZone.

Code P0126 - Coolant Temp is always low.

3 possible causes

1) Check Engione Coolant
2) Thermostat defective
3) ECT sensor defective.

I added approx two pints of coolant. The Check Engine Soon light went out and the temp gauge started working again.

Posted on Dec 28, 2008

  • 1 Answer

SOURCE: low heat from heater

Had same problem. Take off both hoses to the heater core at the fire wall. Using a garden hose with nozel flush with water on the "inlet hose" first(the one hot to touch) then flush the other side. A nasty blackish slim will come out. Oh, cover your distributor with a plastic bag first so it won't get wet. Put the hoses back on, set heat for full high and enjoy your nice warm bravada again!

Posted on Jan 18, 2009

  • 1985 Answers

SOURCE: 1999 Oldsmobile Bravada Heating Problem

when engine is cold remove radiator cap and check coolant level,sounds like it is really low and has an air pocket in it.

Posted on Dec 11, 2009

  • 1867 Answers

SOURCE: Our Intrigue is blowing anti freeze. We have

The problem will have nothing to do with switching on the heater in the car.

The cooling system pressurizes and if there is a leak in the system the coolant will flow out the points of least resistance. If you are losing a gallon every 2 days the leak is major.

1. All elements of the cooling system need to be checked for leaks including the radiator core, all hoses including the heater hoses, all connections and all cooling system gaskets. I would also run a pressure test.

2. If everything in and on the system checks out then I would suspect coolant is leaking from a blown head gasket and running into the engine's lubricating system and into the cylinders.
If the car has been operated with the engine overheated at any time it is not hard to cause head gasket failure and other damage to the engine. Head gaskets can fail in some vehicles over time in any event. Pull the engine oil dipstick out a number of times and check the oil quality. If you see any traces of a whitish substance in the oil that substance is coolant and it is escaping through the faulty head gasket. Also after running the car, and checking the coolant in the radiator once it has all cooled off, you may also notice traces of oil in the coolant.

Do not drive the car any distance in this condition as you will run the risk of too much coolant escaping and the engine will definitely overheat potentially causing even more damage than might otherwise be found now.

Get the vehicle to a reputable auto repair shop and have the problem checked out.

If a faulty head gasket is the source of the leak, the head on the engine will need to be removed (to access the gasket) and the head and engine block inspected. This work will not be cheap especially if machine work on the head is required or if the head itself was found to be cracked.
Given the low market value of these 2000 build cars, you would have to consider if it was worth repairing in the event you were faced with major repair costs.


Posted on Dec 22, 2009

  • 416 Answers

SOURCE: heater blows hot air for awhile but than blows

check coolant level in radiator and coolant bottle sounds like it may be low on coolant

Posted on Feb 09, 2010

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