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4.0L OHV & SOHC V6 Tech General discussion of 4.0L OHV and SOHC V6 Ford Ranger engines.

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  #1  
Old 03-03-2008
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constant low temp

what temp does your truck keep steady at? mine stays right at cold or below. i have replaced the coolant temperature sensor. maybe the themostat?
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Old 03-04-2008
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Did you replace the ONE pin sensor or the two pin sensor?
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Old 03-04-2008
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the thermostat is your problem....
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Old 03-04-2008
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i had the same prob and i replaced the thermostat and it fixed it!
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Old 03-04-2008
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x2
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Old 03-04-2008
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thermostat stuck open
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Old 03-04-2008
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being a 4.0l,can almost bet its the stat
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  #8  
Old 03-04-2008
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i have the same problem, im to lazy to go out an get a new one, and its to cold out.

sad thing is, the one i have in it now is a new stant from murrays.
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  #9  
Old 03-04-2008
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picked one up today for $4.95. i'll be changing it out this weekend. looks like it will be a cinch.
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  #10  
Old 03-05-2008
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Icon9 Same problem

I have the same problem with my '92 (2.3L). Replaced the T-stat and still won't climb into the *normal* temp range and heater blows 45 degree air (mind you it's 25F outside). Performance and Mileage really sucks because it never reaches running temp, down +20% or more.

Truck has set for about 5 yrs, and just bringing her back to the road now, drained the antifreeze, new t-stat, water pump is working, radiator appears clear.....but I'm lost, cooling systems are pretty simple, but I can't figure this problem out.

Ideas?
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  #11  
Old 03-05-2008
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maybe the coolant temperature sensor? only thing i can think of.
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Old 03-05-2008
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Quote:
Originally Posted by n0trq View Post
I have the same problem with my '92 (2.3L). Replaced the T-stat and still won't climb into the *normal* temp range and heater blows 45 degree air (mind you it's 25F outside). Performance and Mileage really sucks because it never reaches running temp, down +20% or more.

Truck has set for about 5 yrs, and just bringing her back to the road now, drained the antifreeze, new t-stat, water pump is working, radiator appears clear.....but I'm lost, cooling systems are pretty simple, but I can't figure this problem out.

Ideas?
could be a bad heater core, who knows.



just because its new doesn't mean its good, i just put a new tstat in mine and its messing up.

IMO, i would get a motorcraft tstat from ford, thats what im doing this time.
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Old 03-05-2008
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Quote:
Originally Posted by SB05EDGE View Post
thermostat stuck open
x2
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  #14  
Old 03-25-2008
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fixed it!

i finally got a chance to change out the thermostat and my engine temp was up to normal with in five minutes. usually, i never saw it make it past the n on normal. thanks guys.
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  #15  
Old 04-02-2008
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Forgot to post a follow up... seems the *new* t-stat was no better than the old one... replaced it with another purchased from another parts store and she's been holding normal temps without complaint.
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