Question about 1998 Oldsmobile Bravada

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I have the 1998 oldsmobile bravada...replaced water pump, radiator, thermostat, radiator cap and fluid is full...when i turn heater on the air is barely warm...what is air lock you were talking about

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Heater coil perhaps?

Posted on Oct 05, 2010

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4 Answers

Over heating


How did you check thermostat? Did you check coolant level. Is the auxiliary water pump leakinh

Jun 14, 2014 | 2000 Dodge Durango

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I have a 1998 4runner the heat blowns warm and when i come to a stop it blows cold , replaced heater core & thermostat already.


I hope this helps!
The heater on most all cars is higher than the engine and water pump in particular.
Because air rises, if there is any air in the system it will rise into the heater.
Try taking off the radiator cap and running the engine at medium speed with the heater on full.
The water pump should pump the air out of the heater and this could solve the problem..
It might take 5 minutes.
Be sure to keep the radiator full of coolant as you are watching.
Be Blessed.

Feb 16, 2013 | Cars & Trucks

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Engine overheating i have replaced the radiator has plenty of water


replace thermostat.then bleed coolant system, this is how you do it.fill the cooling coolant system with 50 / 50 dexcool and water to raise boiling point,straight water will evaporate boil away cause engine to overheat catch fire thats why you need 50 / 50 mixture antifreeze and water.to bleed coolant system first fill coolant system until coolant stay at the full cold mark on the the coolant overflow jug,then you start engine allow it to idle,place the heater and ac control in any ac setting except max and the temperature control to the highest setting,run engine until lower hose to water pump is hot. with the engine hot run the engine speed up to 3000 rpm and allow it return to idle, repeat this 5 times. slowly open the bleed valve on the thermostat housing or look for bleed valve at the water pump heater hose.open bleed valve for 15 seconds to expel any trapped air.then top off the coolant as necessary,and when top radiator hose hot thermostat open up.keep adding cooling to overflow until coolant level stop at full cold mark dont over fill coolant.if engine seem like overheating while looking at cooling gauge turn off engine wait a while until cool off add more coolant until coolant level stay stable and dont drop any.when open radiator overflow cap use large rag over the radiator cap to keep from getting scald open radiator cap a little at a time but dont open radiator cap until engine cool down first.replace the radiator overflow cap, thermostat,and engine coolant temperature sensor and check the cooling fans fuses and relays see what happens.

Aug 18, 2012 | 1998 Oldsmobile Intrigue

1 Answer

Drained radiator by disconnecting bottom hose then when i filled it back up only about hlaf as much coolent would go back in . The top hose gets hot but the bottom hose is cool to the touch could it be...


Hello! Thermostat needs to be replaced, but the cooling system should be "back flushed"...Go to a local auto parts store and purchase a back flush kit (under$10)
It's a plastic tee that is installed in the heater inlet hose... A garden hose connects to the stem of the tee and cooling system is flushed out of the top of the radiator...Let it run until clear...Install thermostat...Cap off the tee...Add a gallon of 50/50 and the rest with Distilled water...Leave the cap off until all air bubbles out (even after thermostat opens)...With heater set on high...Install cap when all air is out...Guru...Saailer

Oct 04, 2011 | 2002 Oldsmobile Bravada

2 Answers

I have a 1998 Oldsmobile bravada....just put new radiator, water pump, thermostat, radiator cap on and fluids are full....when i turn heat on....the ac automatically keeps kickin on causing me to only get...


did you burp the system after you where done. The heater d-core is the highest place in the cooling system and will be the first to collect an air pocket. Running the vehicle at idle with the cap off will help purge the air out.

The a/c will turn on any time the mode switch is on defrost. When the heat selector is turned to hot the air will first go through the a/c evaporator core and then through the heater core. When the heat selector is turned to cold air will only go through the evap core. So regardless if the a/c compressor is on or not with the heat selector on hot it should blow hot air.

Did the heat work before you replaced the other parts?

If not than it is possible that the heater core is plugged. Especially if the coolant was really dirty before you started.

Oct 05, 2010 | 1998 Oldsmobile Bravada

2 Answers

1999 Olds Alero. Low coolant light comes on and stays on even though its full. Starts running hot to the 3/4 mark. When the heater is turned on it cools off. Could this be the thermostat or the water pump.


TAKE RADIATOR CAP OFF WITH ENGINE COLD AND CHECK WATER ..MAKE SURE RADIATOR NOT BLOCKED,,PLASTIC BAG ETC. THIS SOUNDS LIKE LOW WATER OR RADIATOR ..STOPPED UP INSIDE ..IF YOU HAVE GOOD HEAT IT'S FULL OF WATER. REPLACE T STAT B4 RADIATOR..IT'S CHEAPER. ALSO CHECK FOR RADIATOR COOLING FAN OPPERATION..I,M RULING OUT THE WATER PUMP.

Mar 20, 2010 | 1999 Oldsmobile Alero

2 Answers

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.

Dec 02, 2009 | 1999 Oldsmobile Bravada

1 Answer

Fan blows cold air no heat


Check your radiator fluid to make sure it is up to the right level on the overflow tank. If it's low, add up to the level and let the car run to work out the air bubbles and add more until it stays where it should be. Check your heater.... If it heats now, problem solved. If that doesn't fix it then I would look at replacing the thermostat.

both are inexpensive fixes. Good Luck

Oct 08, 2009 | 1998 Oldsmobile Bravada

1 Answer

Front reader only blows cold air


It is either 1 of three things. You may be low on antifreeze in your radiator, or your water pump is beginning or has failed. Turn your engine off and let it cool down. Take off the radiator cap and look down in the radiator and see if you can see fluid. If fluid is not near the top, you need to add antifreeze. If it is full you probably have a bad thermostat or a bad water pump. Both of these are easy to fix by someone good with tools.

Jan 31, 2009 | 1993 GMC Suburban

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