SOURCE: 1990 toyota pickup 22re engine runs hotter with ac on
I would bet that your fan is not coming on. When an airconditioner is on it uses alot of power and that makes heat. The engine will warm past the safe point. Most vehicles should have a switch that turns the fan on and off to cool the motor. You can start the vehicle and pop the hood. once it gets warm if you don't see the fan come on that's most likely your problem. Be very careful around the blade because they come on and off suddenly. I go to Auto Zone for free diagnostics. They only sell parts but can walk you thru possibly fixing it yourself.
SOURCE: Gas guage no longer works when below half a tank.
same thing happens with my malibu, except it works its way back up to full accurately. when its back up to full i know im almost empty. kinda weird but i got used to it.
SOURCE: Gas gauge in the dash malfunctioning - 1990 Nissan Hardbody truck
It sounds like the float on the sending unit is sinking. Don't know what the float is made of, but over time, it will soak up gas and start to get heavy. This would cause your problem. I don't think it's the gauge, but if you want to test it, disconnect the wires at the tank. The gauge will either go to full or empty. If you ground the sending wire, the gauge should respond the opposite way it was. good luck
SOURCE: 1992 Nissan pickup will not turn over. starter is
ITS GOT TO BE THE STARTER,,,IF NOT I WOULD LOOK AT THE FLY WHEEL ...
SOURCE: 1990 f250 5.0 dual tank
Backfiring is not going to have anything to do with the level of fuel in the tank. You most likely have burned valves or broken valve springs in your engine. I would do a compression test.
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