I have a 98 Ranger with a 2.5L 4banger. It takes me about 5mins to get to work so the engine sometimes doesn't get a chance to fully warm up. I usually let it sit for about 5 mins at idle before I take off to let it warm up alittle. When the engine gets warmed up, I turn on the heater and the temprature guage just immedietly goes back to "C" It's been doing this for about couple weeks now and I suspect it maybe the thermostat??? My Rangers temp guage usually runs between C and H on the guage right smack in the center where it belongs. Turn on the heater and it falls back to C real quick. Why does it do this???? 91
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Overcooling??
- Thread starter airjames
- Start date
LouisanaJeeper
New member
Your thermostat is probably stuck open.
imported_rusty bumper
New member
I agree...Try changing the thermostat.
On cars nowadays, the engine needs to run at the proper temperature so the computer sensors can fine tune the engine.
On cars nowadays, the engine needs to run at the proper temperature so the computer sensors can fine tune the engine.
imported_CBX Carl
New member
Is the cooling system full ?
imported_BretFraz
New member
While you're changing the thermostat, install a new radiator cap. Maintaining full pressure in the cooling system is important. Plus a new cap is only a few bucks.
Lowejackson
New member
Or it could be faulty wiring or sender. Before buying a new thermostat, take out the old one and test it in some gradually heated water.
Lost Pup said:Is the cooling system full ?
Lost Pup,
Yes my cooling system is full. The coolant is not green so on top of everything a good flush and refill should be in order soon. Tks to everyone for the help:up ,,,,,,91
bretfraz said:While you're changing the thermostat, install a new radiator cap. Maintaining full pressure in the cooling system is important. Plus a new cap is only a few bucks.
Werd. :bow
Don't get another Motorcraft thermostat, they SUCK. I had 3 die in my Explorer. Get a Stant, Robert Shaw or something of that nature. NAPA house brand is Stant, and costs about $5 for the thermostat and 25 cents for the gasket. I've been running the Stant for 15K miles so far and no problems.
:xyxthumbs