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2 1/4 at tailpipe
AGE and engine failure
The circuit has a short or is overloaded.
Sounds like your heater core is leaking
leaking intake gaskets...
how come my cigarette lighter keeps blowing fuses in my 2000 ranger
If the timing chain is noisy , otherwise if you are having the engine rebuilt
The transmission fluid could be leaking into the engine coolant through the transmission cooler in the radiator. You should be able to see the transmission fluid in the engine coolant recovery tank. It will look like a oily film on top of the coolant. White smoke (steam) out of the exhaust indicates engine coolant is leaking into a cylinder.This can be a result of a blown cylinder head gasket or a cracked cylinder head. Have the engine coolant system pressure tested to detect the leak.
If black smoke is coming out of the exhaust of a 1986 Ford Ranger, it is likely burning oil. It's possible that a seal is leaking in the engine.
Its the oil sensor.
You most likely have a leaking heater core inside the truck.......
If it stops blowing cold air then your clutch on the compressor is probably not any good, or it could be that you need to recharge your freon and lubricant