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Disconnect the battery. Drain the cooling system. Working in the passenger compartment remove the panels from under the dash and the steering column trim cover. Remove center console if you have one. Remove the heater outlet duct and glove box. Remove the heater core cover. Disconnect the heater hoses from the heater core. The hoses and clamps are in the engine compartment on the firewall. You may have to rotate the engine forward and remove fuel lines transmition dipstick tube and the plenum to gain access to these. Remove the heater core.
What else can I help you with?
Why is my heater not blowing warm air in a 1990 buick regal?
Could be a bad thermostat or heater core
Why is your heater blowing out warm air in your 1990 buick regal?
Isn't a heater supposed to blow warm air?
How do you replace the alternator on a 1990 Buick Regal?
Disconnect the 1990 Regal battery. Remove the alternator belt. Unhook the wiring from the alternator then unbolt it. Remove and replace the alternator then reconnect the wiring, belt, and reconnect the battery to finish the installation.
How difficult is it to replace a water pump on a 1990 Buick Regal Limited?
It isn't easy. If you want, get a manual on your car from DISCOUNTAUTOREPAIRMANUALS.COM for about $9 and it will show you how.
Where is the radiator drain plug on a 1990 Buick Regal?
Look at the bottom or rear of the radiator
Where is the fuse that controls the interior lights for a 1990 Buick regal GS?
in the fuse box
What tools do you need to change the front and rear brake pads on a 1995 Buick Regal?
On my 1990 Buick Regal, I need an 18mm wrench , a 10mm wrench, screwdriver, jack, and a can of brake cleaner
How do you set the timing on a 1990 buick regal with 3.1?
It's computer controlled. No timing adjustments are possible.
How do you replace timing belt in 1990 Buick Century?
The 1990 Buick Century has a timing chain and not a belt. No replacement is necessary.
Where is the fuel filter located on a 1990 buick regal limited?
I believe that one is under the car near the gas tank.
How do you remove and replace a heater core on a 1990 Toyota Celica?
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Where is the flasher for 1990 Buick Regal Limited?
Hey Arlene==Look under the dash on the drivers side of the steering column. GoodluckJoe
