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Old 05-19-2006, 12:07 PM   #1 (permalink)
Mik
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running extremely hot...thermostat stuck closed??

do thermostats fail in the closed position? or when they fail do they stick open?

my 91 E350 runs extremely hot (the guage doesn't say so, but does it really work anyway?)

after a run to get an oil change, came back, popped the hood and the rad, upper rad hose were too hot to touch and i'm not thin skinned!!

rad fluid is at top of the coils/fins
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Old 05-19-2006, 12:08 PM   #2 (permalink)
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Re: running extremely hot...thermostat stuck closed??

They often fail in the closed position (Probably the most common). The water pump might be the fault.
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Old 05-19-2006, 12:12 PM   #3 (permalink)
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Re: running extremely hot...thermostat stuck closed??

oooo!....water pump...hadn't thought of that

what kind of things can i check to determine if the water pump is the problem?
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Old 05-19-2006, 12:21 PM   #4 (permalink)
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Re: running extremely hot...thermostat stuck closed??

Water pumps sometimes make a growling sound when going bad but not always. A very remote posibility but a 2 second check is the fan belt (just in case). If there is no water flow, The only things I can think of are: No coolant, stuck thermostat, plugged radiator, bad water pump and possibly some electronics on late models where the temp is maintained via computer. Also, the temp gauge could be giving false readings but don't count on it. Check for hose pressure on the intake and outflow of the radiator. Of course do not run the motor if it is above temp since engine damage may result.
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Old 05-19-2006, 01:06 PM   #5 (permalink)
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Re: running extremely hot...thermostat stuck closed??

An infrared Temp. gun is handy to diagnose cooling system problems like that. Hit the top hose and know plus-or-minus a degree what the temp really is....also hit the radiator core and find plugged areas not dissipating heat.
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Old 05-19-2006, 04:42 PM   #6 (permalink)
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Re: running extremely hot...thermostat stuck closed??

Could certainly be one of the things Roger said, another would be your fan clutch is not locking up. Also, if they sand or cinder your roads up there in winter, I've seen them so plugged with cinders it caused overheating. Also pull the cap and what few tubes you can see, make sure they're not plugged.
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Old 05-20-2006, 11:56 AM   #7 (permalink)
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Re: running extremely hot...thermostat stuck closed??

The 1st thing I would do on a 91 van would be to pull the front grill assembly and power wash the condenser, and radiator. Years of build up seem to be common on older vehicles, then check what everone else has posted. Good luck
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