Running too cool
#1
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Year: 1991
Model: Cherokee
Engine: 4.0
'91 4.0 - Recent (5 months ago) rad, cap, tstat, watr pmp, hose replacement and flush. I know the heater core valve is going out. I have a replacement. But it is running VERY COOL. Will not get to normal op temps at all. Its 10-20* here but it should. Think tstat is stuck open??? Or could core valve cause this?
Last edited by Disoriented Hillbilly; 01-16-2012 at 06:54 PM.
#6
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Year: 1991
Model: Cherokee
Engine: 4.0
Originally Posted by djb383
It should reach t-stat temp or very close regardless of ambient temp. Might want to shoot a temp gun at it to verify coolant temp and gauge.
Last edited by Disoriented Hillbilly; 01-16-2012 at 03:23 PM.
#7
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Year: 1991
Model: Cherokee
Engine: 4.0
Originally Posted by freegdr
i know you seen the tractor trailers with the covers over there grills to bring temps up
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#8
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Year: 1998
Model: Cherokee
Engine: 4.0L HO
Big difference between big diesel rigs and the XJ. 1st, diesel burns cooler than gasolne and 2nd (main reason) big rig rads are way over built/sized and the XJ rad is way under built/sized.
#9
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Year: 1991
Model: Cherokee
Engine: 4.0 H.O.
I would assume the problem is in the thermostat. In Truckee we average negative Temps in the winter time. At the most when I'm driving to work at 4 AM in -0 to -15*, my temp gauge only drops too 200*, and the heater still stays nice and warm.
#11
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Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
You possibly have a thermostat that is defective. I only buy them from the dealer anymore. Part number 83501426.
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Year: 1991
Model: Cherokee
Engine: 4.0 H.O.
#14
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Year: 1991
Model: Cherokee
Engine: 4.0
Its 50* here now. Should be hot. Gonna swap stat out later. See if that fixes it. Other than that any ideas???????? Swapped out heater core valve already. Didnt think that would have anything to do w/ it.