What year? Some of them were under the hood on that model, and some were behind the dash on the passenger side, If it is an 85 for example there is a big black plastic box under the hood on the passenger's side it has several screws in the top and you need to take off the windshield trim the silver piece at the bottom of the windshield that is the easiest one to remove the other you have to take out a lot of screws in the dashboard just about removing almost all of it on the passenger side, then go under the hood and remove the 2 hoses from it.
Where is the heater control valve on a 1994 Buick Regal
should be on the passenger side right along the fire wall
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Where is the knock sensor located on a 1992 buick regal
How to fix heater in Buick there is cool air ,fan is work .but no warm air
Could be a bad thermostat or heater core
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How do you replace the fuel filter on a 2003 Buick Regal?
the pcv should be near the front valve cover