Ford Ranger Cooling

ford
gasoline
ranger

#1

A 1995 Ford Ranger with a 4 Liter engine and 170K miles has a temperature problem. The temperature gauge cycles to high and back down within 10 to 15 seconds at highway speeds. It happens more often while climbing a grade. Down shifting will bring the temp gauge quickly down within a few seconds. The radiator, water pump and thermostat were replaced at about 150K miles. Coolant level is OK.

Can lower octane fuel be a factor?


#2

temp cycles up and down to what? over heating, or just fluctuating?

it may be something as simple as a temp sender unit. but you should figure out if it is indeed overheating. you have not been clear on that.


#3

You might have air in the system. Try running your engine for a little bit with the radiator cap off (engine cold, of course). Also try changing your radiator cap if that hasn’t been done lately.


#4

Agreed. I have used the absence of temperature cycling to detemine when all the air was out of a system after a coolant flush. If this started recently there may be a head gasket leak or maybe the antifreeze water mixture is wrong and this is simple boiling.


#5

I will check on if it is actually overheating.
Thanks:
Tony


#6

The gage normally read about 10 to 20% to overheat when running OK. The fast cycle up goes anywhere from 60% to 90% to the top of the gage.