Temp gauge going funky, Updated! Changed Thermostat but still does the same prob Options

[reko]

As i was driving on the highway on friday night i noticed that my temp gauge was almost at cold which isnt normal for a sunny summer day.

After rolling for 10mins, it went to normal temp. but started to go slowly from normal to cold back and forth 4 to 5 times after what it stays at the first 1/4.

It did it only once, but then on the next day, it did it 2 times and went back to normal.

Nothing happened yesterday, but still, i dont really like this.

I'm thinking thermostat, but who knows?

Is it bad? I mean I went to school today (which is about 20kms from my house)... should I change that tonight?

**UPDATE**
25/08/08: Changed changed the thermostat... The shaft bent so it was stuck open so I just put one for Camry since the one for Celica 2.2L didnt fit (dont know why but anyway....) Still does the same problem as before... temp gauge isnt stable...

So what's next?
Water pump maybe

This post has been edited by reko: Aug 25, 2008 - 5:47 PM

[Dr_Tweak]

If it's still getting too cool then there's still a problem with the thermostat, you need to make sure that it fits perfectly in the housing and also make sure you replace the rubber gasket that goes around it.

For what it's worth, NAPA seems to have the wrong part listed for the '94 GT, I know that I recently dealt with that and they kept giving me the wrong one, I asked for one for a '96 I think and that was the right one.

Hope that helps!

-Doc

[reko]

If it's still getting too cool then there's still a problem with the thermostat, you need to make sure that it fits perfectly in the housing and also make sure you replace the rubber gasket that goes around it.

For what it's worth, NAPA seems to have the wrong part listed for the '94 GT, I know that I recently dealt with that and they kept giving me the wrong one, I asked for one for a '96 I think and that was the right one.

Hope that helps!

-Doc

That's what happened so i just took the one for Camry's since they are the same engine and it fit perfectly...
The guy had on ly 94-95 in his book so...

Anyway yeah i changed the gasket as well... might only be the fitting part maybe...

Is there a way to put the thermostat i mean... is there a "top" and "bottom" part? Maybe i put it upside down.

The one i had that was broken has a little bleed valve (hole) in it and not the new one, think it cuold result in some issues?