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Old 12-16-2010, 11:06 AM
FX4OR FX4OR is offline
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Default Overcooling?

hey guys, this is my first "real" post.

My truck never seems to get warmed up, no matter how much I drive it.
it eventually makes its way up to just below the normal spot on the gauge (picture below), but never higher. It gets up to this point after about 6 highway miles from sitting overnight.
2010-12-16 07.00.12.jpg

When I go to turn the heat on, the temp gauge drops to the level in the next picture (sometimes it goes lower), and the heater blows cold. after a minute or two, the heat gets warm, but definitely not hot. the gauge also gets back up to its 'almost normal' spot (as above) after 1-2 minutes. Is this just the way these engines are, or is a new thermostat in order?
2010-12-16 07.00.59.jpg
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Old 12-16-2010, 11:28 AM
pooleo pooleo is offline
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Default Re: Overcooling?

Is your heat still warm/hot when the gauge drops...?

Remember that those gauges are not accurate. I have a temp gauge on the pillar and it is way off from the factory gauge. Factory gauge in the middle reads 160 on the real temp. 210 on the real temp and the factory gauge only shows to the top of the temp pic on the gauge.

We just installed a real temp on my ol mans ranger, his never came off the first mark. But while the factory gauge is at teh first mark, the real temp shows 185*.

I would say that they temp sensor is bad.

----------

Now I have a flex fan mechanical fan on my ranger, and it will open and close the T-state because it cools so fast. It is possible if your clutch fan is locked up that it might do this.

I think what is happening is the truck warms up the temp gauge goes up, then the T-stat opens up and the needle drops.

It probably ok, just the gauge is off.
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Old 12-16-2010, 11:28 AM
aaron_ariens aaron_ariens is offline
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Default Re: Overcooling?

Hmm, mine is ALWAYS right in the middle. Just my $0.02, hope someone has a better answer. Haha.
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Old 12-16-2010, 12:22 PM
terryduanemiller terryduanemiller is offline
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Default Re: Overcooling?

my 2.5L is doing the same. everyone seem to think T-stat is bad. althought tstat is less than 3 months old.... I had same problem last winter, i flushed heater core with pressure, and it worked fine all last winter, now its doin it again since weather has became very cold.
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Old 12-16-2010, 05:56 PM
FX4OR FX4OR is offline
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Default Re: Overcooling?

wow, you guys are quick!
Quote:
Originally Posted by pooleo View Post
Is your heat still warm/hot when the gauge drops...?
It is warm at first, but it goes cold along with the needle, then warms up again as the needle returns to the middle. The fact that the gauge corresponds to the heater temp makes me think that it is working, I wouldn't be surprised, though, if the sending unit is going crazy and reading low, but still moving up/down like it should. I'll definetly look into it.
The fan clutch is fine, I checked that, easy to turn when cold, more resistance when hot.
I'll be doing a coolant flush in about 2000 miles at 120k along with all the other fun 120k stuff, maybe that will work if the gauge turns out to be fine.

Thanks for the replies
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  #6  
Old 12-27-2010, 08:20 AM
skarp skarp is offline
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Default Re: Overcooling?

i just bought a 93 ford ranger. gauge always stays a little above the c and always only blows luke warm air. just replaced the thermostat on christmas eve. didn't make it any better. truck never overheats so i assume the water pump is working good. any ideas.. help! any thoughts or explanations would be great
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Old 12-27-2010, 08:05 PM
FX4OR FX4OR is offline
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Default Re: Overcooling?

I know this is kinda old, but figured better to bring it back than start a new thread.

I'm still getting the same 'almost normal' temp reading as above. After running the truck about 15 miles on the highway, I popped the hood and felt the coolant hoses, both heater core ones and the upper radiator hose were warm, but not hot by any means. Drove our other cars about the same distance, and felt the hoses after the drive, and both were WAY hotter than mine. Before I go get a thermostat tomorrow, does anyone have any other ideas as to what it could be?
thanks
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Old 12-27-2010, 08:22 PM
2002 2WD Edge 2002 2WD Edge is offline
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Default Re: Overcooling?

It definitely could be the thermostat. Bad rad cap, too strong anti-freeze mixture and a few other things are possible. You are going to get the coolant replaced soon I think you said? Put a new cap on then..they are cheap.
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Old 12-27-2010, 08:23 PM
terryduanemiller terryduanemiller is offline
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Default Re: Overcooling?

Quote:
Originally Posted by FX4OR View Post
I know this is kinda old, but figured better to bring it back than start a new thread.

I'm still getting the same 'almost normal' temp reading as above. After running the truck about 15 miles on the highway, I popped the hood and felt the coolant hoses, both heater core ones and the upper radiator hose were warm, but not hot by any means. Drove our other cars about the same distance, and felt the hoses after the drive, and both were WAY hotter than mine. Before I go get a thermostat tomorrow, does anyone have any other ideas as to what it could be?
thanks
flush the heater core, the little amount of coolant that passes thru the core runs over temp sensor on exit, this is where you get your reading from.. the lack of flow thru the core is cooling what coolant is in the core by extracting the heat, then the cool coolant it sent out running over the sensor.. I just did mine... trust me.. try this before you go get a stat.. it doesnt take much to clog the core.. flush it in both directions..
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  #10  
Old 12-27-2010, 08:38 PM
FX4OR FX4OR is offline
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Default Re: Overcooling?

Sweet! that actually does make perfect sense. any idea how much coolant I'll have to replace from the heater core after flushing it?

edit: never mind, its not too big of a deal, I'll just pay it more attention when I do the whole system soon.
thanks
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Last edited by FX4OR; 12-27-2010 at 08:50 PM.
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  #11  
Old 12-27-2010, 08:53 PM
terryduanemiller terryduanemiller is offline
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Default Re: Overcooling?

Quote:
Originally Posted by FX4OR View Post
Sweet! that actually does make perfect sense. any idea how much coolant I'll have to replace from the heater core after flushing it?
glad it did, I re-read it at least 5 times before posting it, lol.... if you haven't recently flushed the system, I wld force flush it all.. its only round $15.00 for a gallon of anti-freeze.. if that's not the route you wanna go, buy a tester for a few bucks, you may not need to add any more after flushing the heater core.. and the new tester will come in handy every year..
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