The thermostat on a 1991 Buick Skylark is located near the engine. To find the thermostat, follow the top radiator hose directly to the thermostat.
The PVC valve for a 1991 Skylark should be located on the top of the valve cover. It is a plug in type, twist and pull to remove.
a 1991 buick skylark has 4" speakers in the dash and 6x9's in back
how do you replace a ignitionswitch tumbler 1991 buick skylark
I believe that one is under the car near the gas tank.
where does a clutch relay seleniod go in at on a 1991 buick skylark
I'd say about 2.5 tons.
If it has a coolant tank, that's the "cap".
You can find the 1991 Buick Skylark radiator drain plug on the bottom of the radiator. The radiator drain plug will be in the center of the radiator bottom.
Under dash with fuses. Very hard to see.
In a removable housing at the engine end of the upper radiator hose
On your 1991 BUICK SKYLARK, the FUEL FILTER is: UNDER VEHICLE, CENTER, BELOW REAR SEATING AREA, REAR PASSENGER SIDE OF FUEL TANK, MOUNTED IN FUEL LINE You can find this stuff free at autozone.com under repair info, component location.
Probably a worn-out or clogged heater core.