Friday, November 19, 2010

How do i change the thermostat on a 1991 jeep cherokee inline 6 , 4.0 litre?

is it something easy or should i go to the shop for it?How do i change the thermostat on a 1991 jeep cherokee inline 6 , 4.0 litre?
Drain a little antifreeze or it will leak from around the thermostat when you remove it. There should be a drain at the bottom of the radiator.

IF I remember correctly the thermostat is under the large hose that comes out of the top of the radiator and goes to the engine. Follow the hose from the radiator to the engine and THAT is where the thermostat should be.

Loosen the clamp that holds the hose onto the housing and slip the hose off.

There are two bolts in the housing that must be removed and the thermostat is supposed to be in the housing.

Pay attention to which way the spring is sitting. Toward the engine or away?

Clean the surface and use either silicone sealant or a gasket. Place the thermostat in the opening on the engine and position the housing over it and install the bolts, the slip the hose back on and tighten the clamp.How do i change the thermostat on a 1991 jeep cherokee inline 6 , 4.0 litre?
yea asian technician
It shouldn't be too hard for you. The easiest way to replace it is to drain the coolant. Follow the upper radiator hose to the engine. Remove the hose from the engine. There should be 2 bolts holding the housing to the engine. Remove these and the housing. Remove the thermostat. Clean all the gasket material from engine and housing. Install new thermostat, gasket, and housing. Reinstall hose, fill coolant. Run engine and keep coolant level where it should be.
just open the hose ! its on the head !just under the oil change!
Be careful when draining the anti-freeze! At least with my 93 Wrangler with the 4.0, it drained out and hit part of the sterring stabilizer or something (A thin metal bar running the width of the suspension in the front) and got EVERYWHERE, and this stuff is really, really really toxic to all mammals, and dogs and cats think its very tasty stuff! It only takes a few teaspoons to kill a cat.

The antifreeze (ethylene glycol) crystallizes in the liver... bad news.

You can get pet safe anti-freeze, Prestone makes it, its made of propylene glycol, same stuff thats found in a lot of processed foods and shampoos and stuff. Not ';good'; for you, but not poisonous, and safer for animals if you ever have a water pump blow, or a leak, or are just klutzy like me. It works just as well or Prestone wouldn't sell it I am sure.

[I did clean it all up BTW]

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