Where is the themostat - 1995 Toyota Previa

Should be on front of motor pass side if its a 3.5 liter. 3.9 4.3 follow upper radiator hose

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It's inside the timing cover. Change the housing (with sensor) when you change thermostat.

I am assuming you have the 4.6 engine and the thermostat is in the outlet for the upper radiator hose.
The nipple or spring part of the thermostat sets down in the intake where it will make contact with the hot coolant.

the themostat is on driver side of car in the bottom hose connected to the engine take bottom hose off at motor and its in the housing that the hose was connected to two bolts to take out

need new themostat. first check to see if you have enough coolant in resivior and start from there. second check for obvious leaks in hoses. lastly if no leaks then its your themostat. is this s 6 cylinder or 4 cylinder?

Vehicle:
1999 Mercury Cougar Engine: V6 2.5 Liter V6 2.5 Liter FI Regular Thermostat: 180 Degree; Alternate Temperature

first of all check the radiator for leak or blockage. make sure the coolant is fresh. follow th eupper radiator hosr to the emgine block. there should be 3 bolts attached the themostat housing. take the themostat out and put it with hot water, maks sure the opens. the temperture sending unit should be directly under the themostat. msot likely the themostat is cause or the problem. unless the temperture gage is not reading correctly.

BAD HEAD GASKET.....

try removing themostat and see if temp improves make sure themostat is fitted the wright way not upside down

the themostat sounds to be stuck open , take your vech in and have the coolant system flushed and the themostat changed have them check your belt too .