How to replace thermostat 90 Jeep Cherokee?

Answer 1

The t-stat is located on the front of the engine at the top with 2 hoses coming out of the housing---one large (going to the upper radiator) and one smaller diameter going to a water control valve. Remove both hoses from the housing and check them for cracks etc. The bolts are 13mm. It is easier if you loosen the serpentine belt to make it less likely to cross thread the lower bolt. remove both bolts for the housing and lightly pry the housing away from the engine block. Remove t-stat and clean old gasket off both surfaces. If the replacement t-stat has a small hole in the top the hole goes towards the top of the engine. It is easier to use a little sealer to "hold" the t-stat in place when bolting up the housing. NOTE:If t-stat slips and is not in the groove of the cylinder head when you tighten the housing bolts you have a very very good chance of cracking the housing. If you did not loosen the belt---when you install the lower bolt--pull down on the belt to ensure you do not cross thread the bolt. Install large hose onto housing. When refilling with coolant add coolant to the bottle until the coolant comes out the housing where the smaller hose goes---then put hose on and secure. let car run with heater on hot setting and check for leaks.

If car starts to overheat let car cool down and repeat filling procedure. clean off all spilled coolant---especially off belt