Question about 1998 Oldsmobile Bravada

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Need instructions on replacing the heater core in a 1998 oldsmobile bravada?

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This is probably the same as it is on the S-10 truck. You'll have to remove the dash to get to the heater core box. Drain the coolant and locate the two hoses on the engine side of the fire wall and remove them. There are large electrical connectors under the dash that have to be unplugged. Remove the large bolts/nuts holding the dash to the frame and drop the steering column to ease removal of the dash. You'll be able to see the heater core box now. Remove the bolts hold it to the firewall and there are also bolts on the engine side of the firewall holding the box in. This is where it gets frustrating. Remove the blower motor resistor that is mounted in the engine bay and inside that hole is another bolt holding the core box in place. With all of the bolts out you can pull the case apart and replace the heater core. Put it all back together and fill the cooling system. Start the vehicle and run the heat on full. Leave the radiator cap off so air can escape. Watch the coolant level and add as needed until the engine reachs normal operating temperature and put the radiator cap back on. The last one of these I did I charged $450 to do plug parts. His next best quote was $950.

Posted on Nov 12, 2010

  • Talmadge Kemp Nov 12, 2010

    not detailed enough if it were that easy I would have done did it thanx anyway!

  • Brad Kirby
    Brad Kirby Nov 13, 2010

    If you are asking for step-by-step with pictures you'll need to buy a subscription to alldata.com and download it from them, which would cost you more than two dollars. What you are asking for would take about two hours to type out and wouldn't have pictures. Pick up the Chilton's manual from a parts store if you need the pictures and it includes okay instructions for doing this job. Since it takes about 8-10 hours for a well equipped shop to do this, it is not an easy job. The first one I did took me 14 hours using the Chilton's manual that wasn't the most detailed instruction.

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If your cooling system has any bleed screws incorporated, crack them once in a while as well. 2000 Oldsmobile Bravada heater blows cold air. Had a new heater .

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Step by step instruction to replace heater core 1998 oldsmobile 88


1. First you have to disconnect the Oldsmobile vehicle battery, then you have to drain the engine coolant into a clean container, most models don't have a drain plug on the bottom of the radiator, so you must take off the lower radiator hose to drain the system.

2. Second you have to remove the drain tube from the heater's housing and disconnect the heater hoses from the core, to reach out the heat core you have to take off the sound insulators on both sides of the car, then the steering column's opening filler and finally the air outlet duct and the floor air outlet.

3. Third you have to disconnect the heater core cover and then remove the core-to-housing mounting clamps and remove the heater core.

4. Fourth you have to Install the new heater core and connect the mountain clamps. I did a quick online search and if you need new Heater Core this site looks like it has cheap prices, free shipping and great reviews http://www.buyautoparts.com/heater_core.htm

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on a hot day it will blow warm/hot air if the AC is turned off or not working

If its hot air and AC is working then i would start by checking the fuse or relay. if its not the fuse/relay then i would look into the heater box there is a door that blocks the hot air

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Check the heater core to see if it is hot on both tubes entering the firewall. If it is, then the inside should blow hot air as well. If not hot, then the heater core is plugged and will have to be flushed out or replaced.

If the heater core is hot but the inside is cool, then the blend door actuator may be bad.

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Instruction on how to replace heater core on 2000 olds bravada


If it is necessary to remove the heater assembly, the cooling system must be drained before removing the heater core.
When a heater core leaks, a new heater core is installed or the old one repaired.
Heater Housing
  • The heater housing is usually under the dash and must be removed to gain access to the heater core.
  • Procedures for replacing the heater core vary with the year, make, and model of car. It threfore necessary to consult the manufacturer's repair manuals for the proper procedure for replacement.
f74-01.gif The heater housing is disassembled to get to the heater core. Heater Core
  • Remove the access panels(s) or the split heater/air conditioning case to gain acess to the heater core.
  • Remove the heater coolant hoses.
  • Remove the cable and/or vacuum control lines (if equipped).
  • Remove the heater core securing brackets and/or clamps.
  • Lift the core from the case. Do not use force. Take care not to damage the fins of the heater core when removing.
  • To reinstall the heater core, reverse the removal steps.
When the heater core leaks and must be repaired or replaced, it is a very difficult and time-consuming job primarily because of the core's location deep within the firewall of the car. For this reason always leak test a replacement heater core before installation.

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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.

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go too auto zone and get a print out for free!!!!!!!!

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I have this problem also, what is holding the passenger side part of the top part of the plastic air box to the firewall?

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