Where is the AC relay located on a 1991 Pontiac Lemans?
On the back side of the fuse box the relays next to the first 2 on the left are the a/c blower motor relay & a/c control relay. The one on the far right is the warning buzzer & a/c compressor relay
on mine is screwed into the radiator about half way down on the right hand side when in front of the car has two wires coming out of it. If you're having overheating problems it could be the thermostat. Mine went out about 3 months ago and i replaced that relay first aswell made no difference, hope that helps
The fuel filter is located under the car on the passenger side in front of the fuel tank. It is an inline fuel filter that looks like a small can. To replace it, remover the two fuel line connectors from each end and unbolt the bracket. Reverse the proceedures to install. Be sure you have the fuel flow direction going the right way. I have a 1990 Lemans, I assume the 1991 is the same.