Locating a heater core is easy, removing is not. The heater core will have two hoses going through the firewall to it. It will me mounted inside that big black plastic box underneath the dash on the passengers side of the vehicle. They mount in many different ways but you need to open it up to get to it.
Probably a worn-out or clogged heater core.
a 1991 buick skylark has 4" speakers in the dash and 6x9's in back
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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.
I am having the same problem and I WA told it was the heater core. I am going to give that a shot. Autozone has them for $30.00
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If it has a coolant tank, that's the "cap".
I'd say about 2.5 tons.
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.
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.
Under dash with fuses. Very hard to see.
Either a 2.3/2.5 4cylinder or a 3.0 V6
a round one that you can order online
I DON'T BELIEVE THERE IS A BLOCK HEATER.
I believe that one is under the car near the gas tank.
Probably. An auto store would know for sure.
As far as I've read (check dealer for accuracy) 4cyl 2.5L is .040
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.
break the windows
Try the repair tips on the Autozone web site.
may be your heater control valve
Try changeing the fuel filter,I had the same problem and it helped.
It's right in the front and off a little to the passenger side. Big round thing with a belt running to it and a fan. You can't miss it.
Thermostat possibly stuck open. Another possibility is the heater core is clogged. I would recommend you perform a complete cooling system service. Drain and flush the system with the heater set to high. Replace the thermostat, and install a 50/50 mix of coolant and distilled water. Bleed all air from the system.
It should be right there on the fuse box. If you still can't find it, try calling a service center at a GM dealer.