Ok, so here's the problem.

When I start my car, it warms up fine - right to where it should go. However, once I start moving, the temperature gauge goes right back down to a VERY low temperature (like back down to the bottom line)

I tried putting the heat on today and it's coming out cold, so this is going to be a problem if its not fixed for winter.

I'm almost positive it has something to do with the coolant sensor, but I have no idea WHERE the sensor is, or how I would even check it.

Can anybody either describe where it is, show a picture, and/or say how to check/fix it?

Thanks in advance!

thermostat, it's stuck open, it's in the same housing as the coolant fill cap right off the front of the head

Erik P.
Official 2GNT thread Hijacker
Some say that he's driven over more Covenant than he's shot, and that his grenades aren't where you'd expect them to be...
All we know is, He's not The Stig... But he is The Stig's Spartan cousin!

how do I close it? Is there like just kind of little valve I can switch to close it or something?

It's not a "valve" you can control that way. It opens and closes depending on water/coolant temp. Just replace it. I think it's under 10 bucks at autozone, and the new gasket is a buck or two.

This will make it clear for you.

http://auto.howstuffworks.com/cooling-system8.htm

ha.

If the thermostat doesn't help, the coolant temperature sensor is the bigger of the 2 sensors on the thermostat housing below the radiator hose. I believe it has the 2 wire harness plug that connects to it. The one below that is the dash water temp gauge sensor.

Mike D
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Or you have no water in it.

~Luke
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1969 Cougar - 11.91 - 380HP
2007 GSXR 750
1999 OZ - SOLD - 15.26 NA - 14.71 on 75 shot

awesome, thanks everybody.

I'll check it out ASAP