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| fordzatmyplace |
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I have this problem on my 3.9 thats is driving me nuts
when ever i first go to drive it in the morning, about 5 mins after leaving the temp guage climbs right above the 3/4 mark.  Then it drops back down to about 1/4 up the guage. This is a recent thing that now happens all the time
Now (today) i went for a drive, temp guage shot up as usual  and went back the normal range. After stopping the car and driving home the temp guage was now sitting on the 1/2 mark which kinda worries me since it was quite cold outside 
WTF is the cause of this problem, it is currently leaking a very small amount of coolent at the thermostat and i recently topped my coolent up becuase of this. And yes my overflow cap is on tight. Any help?
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| smiley235 |
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I had the same problem.
http://www.fordmods.com/forums/viewtopi ... gage+guage I never worked it out though.
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| madmax |
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Sounds like you need a new thermostat
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| fordzatmyplace |
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madmax wrote: Sounds like you need a new thermostat
how can you tell? is it sticking closed and then only opening when its gets hot?
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| fiftyone |
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sounds like its the thermo. take it all apart, clean the surfaces well WELL! that is to make sure it will seal up right and chuck a new one in. for $15 you'll know for sure.
while its all open, you might want to drain the radiator compleately and flush it. kinda sounds like theres a bit of debris in there. give it all a good back wash and reassemble
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| madmax |
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fordzatmyplace wrote: madmax wrote: Sounds like you need a new thermostat how can you tell? is it sticking closed and then only opening when its gets hot? It the thing that controls temp! It sounds like its out of control. A thermostat is meant to open slowly as the wax inside melts. Your sounds like it staying shut and then openning fully once the temp is very hot. A small cost to give it a go, but buy genuine. When you change it, flush out the radiator and change the coolant.
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| joolz |
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Wax, now thats a new one! i thought it was a special metal spring that contracts at higher temperatures! and i thought that plunger that seals sticks on the shafts after they are worn.
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| madmax |
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Well I guess you learn something new each day then!
Heres some info on how a thermostat works Quote: Any liquid-cooled car engine has a small device called the thermostat that sits between the engine and the radiator. The thermostat in most cars is about 2 inches (5 cm) in diameter. Its job is to block the flow of coolant to the radiator until the engine has warmed up. When the engine is cold, no coolant flows through the engine. Once the engine reaches its operating temperature (generally about 200 degrees F, 95 degrees C), the thermostat opens. By letting the engine warm up as quickly as possible, the thermostat reduces engine wear, deposits and emissions.
If you ever have the chance to test one, a thermostat is an amazing thing to watch because what they do seems impossible. You can put one in a pot of boiling water on the stove. As it heats up, its valve opens about an inch, apparently by magic! If you'd like to try this yourself, go to a car parts store and buy one for a couple of bucks. The secret of the thermostat lies in the small cylinder located on the engine-side of the device. This cylinder is filled with a wax that begins to melt at perhaps 180 degrees F (different thermostats open at different temperatures, but 180 F/82 C is a common temperature). A rod connected to the valve presses into this wax. When the wax melts, it expands significantly and pushes the rod out of the cylinder, opening the valve.
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