Manual or automatic climate control ? Duel zone ? Could be caused by a stuck or sticking temp. blend door actuator . Hooking up a scanner an checking for DTC'S - diagnostic trtouble code's should be the first thing to do , not guessing an just replacing parts . Automatic system can set a bunch of DTC'S
DTC B0126
DTC B0131
DTC B0159
DTC B0164
DTC B0174
DTC B0179
DTC B0184 or B0189
DTC B0234
DTC B0237
DTC B0249
DTC B0252
DTC B0269
DTC B0272
DTC B0279
DTC B0282
DTC B0490
DTC B1000
DTC B2805
DTC P0530
DTC P1536
DTC P1540
DTC P1546
Your best bet mite be to take your vehicle to a qualified repair shop .
SOURCE: cold air all the time
one of you trampillias not working either a thin plastic pipe has come off or computer not working or a control switch so the flap is not opening up allowing the air to blow over the heater core rad .look under bonnet for a valve/solonoid with a pipe in and two or three out,sometimes this packs up which doesnt allow the vacumn through to open the actuators (trampillias)
SOURCE: heater controll doesnt work
Check your vacuum lines. Does any air blow out at all? Is it push button, or have a slide? Could also be a bad cable.
SOURCE: 1998 Buick Skylark is over heating
You need to check the radiator cap for air leaks and also try having the radiator Flushed as you could have plugged fins inside the radiator, causing the radiator not to cool the antifreeze.
SOURCE: 2000 Buick LeSabre heater only blows cold
the climate control thermostat is not opening the valve to let the warm coolant in
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