Having problems with your 1985 Pontiac Fiero ?
I have a 85 2.5 4 cyl fiero. I replaced the water pump and thermostat. Still over heat, seems as if water is not flowing thru system. Please help
Air in the system might be the culprit. There are several techniques out there but filling the system with car level on the ground will not get all the air out. Without getting all the air out, it will overheat. I believe one of the techniques is to fill the system (at the thermostat housing) with the rear end lifted and the radiator cap off until the fluid flows out at the radiator. Then put the radiator cap on and finish filling it up. Also make sure your electric fan on the radiator is working as well as the temperature switch on the engine. I was having trouble with the fan relay and it wouldn't bring the fan on. Additionally at idle, there just doesn't seem to be enough flow so the temperature tends to rise when sitting at idle for any length of time. Unless you live up north, you may want to remove the thermostat. Down south, my engine heats up just fine without confining the water flow and with the limitations in the stock system, you'll never have a problem of running it "cool" anyway!
Repair Help & Product Troubleshooting for 1985 Pontiac Fiero
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