You need to do a lot if it is like my 1995.
You need to remove the back seat
remove the back of the back seat
remove the screws holding the rear deck.. where the speakers are.
then remove the screwss...
what a pain.
a 1991 buick skylark has 4" speakers in the dash and 6x9's in back
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.
how do you replace a ignitionswitch tumbler 1991 buick skylark
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.
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.
It might be easier to go into the trunk with a pair of pliers and twist up on the screws and remove them that way. I have a 1995 Skylark and did that with mine. It wasn't too hard to do but it's a lot easier than taking out the back seat. If you still want to take the back seat out, try Amazon.com and get an old Chilton's manual for Buicks in these years.
Under dash with fuses. Very hard to see.
a round one that you can order online
Probably a worn-out or clogged heater core.