How do you change a thermostat on a 1998 Jeep Grand Cherokee with a 5.8 V 8?

Answer 1

Here's a start from Richard Wheeldon wheeldon88@Yahoo.co.uk - though I don't have specific knowledge of the Grand Cherokee, but heres how I would do it.

The thermostat restricts the flow of coolant circulating to the radiator whilst the motor is still warming up. It is located in the waterline between the cylinder head and the radiator.

Here is where I break into this answer (giant167).

On the 4.7L v-8, the thermostat is located on the bottom left of the engine block. You must drain the radiator and remove the bottom hose to access the thermostat housing.

Mr. Wheeldon continues now.

You might want to loosen the bottom radiator hose clip to drain out and save about 4 pints of the coolant before you start. Look at the top of the radiator and find a large diameter rubber hose headed towards the motor. It should terminate at a dome-shaped housing at one end of the top of the motor. There will be three or more bolts securing the housing. Remove the housing being careful not to damage the paper gasket that seals the housing and hook out the old thermostat. Replace it with one of the same type and temperature rating, making sure it is the same way up. Either replace the gasket or use some gasket past to seal the joint when you replace the housing. Don't over-tighten the bolts. Make sure all the hose clips are secure, then replace the coolant and top it up to the correct level.

Good job!

Answer 2

Follow your upper raidator hose until you find the themostat housing which is the ending point for the hose. Remove the two bolts that hold the housing (you may have to loosen the belt to get to one of the bolts) Remove housing and replace themostat and gasket ( remove any excess gasket that may have been left over ).

Answer 3

Its a tough job. You have to remove the dash panel, including the steering wheel and steering column and then remove the plenum box which involve evacuating the refrigerant system and draining the radiator. Once you get the heater box out, replacing the heater core will take about 10min and then you have to put it all back together and recharge the AC and fill the radiator.

If you are seeing leak problems with the system, you will have to go through this process. If the problem is lack of heat and/or AC control, the problem is more likely the blend door. This is a common fail on the Cherokee. You can get diagnostic information and an inexpensive fix on the HeaterTreater web site. Follow my user name to my Bio Page for a pointer or just search heatertreater on any search engine. ford4me

Answer 4

http://www.automedia.com/Keep_Your_Eye_on_the_Thermostat/ccr20041201th/1