1997 ZJ Thermostat Replacement - JeepForum.com
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Unread 06-14-2004, 09:21 PM   #1
pctech
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1997 ZJ Thermostat Replacement

Hi Guys,

Can someone explain to me how much work is involved in replacing the thermostat in a 5.2L V8 engine? How long should the whole process take?

The one in my 97 ZJ appears to be stuck open causing the engine a long time to warm up to operating temperature. It looks like some accessory components may have to be removed to gain access to where the thermostat is located. Is this the case? Also, how much should I expect to pay a private mechanic to do this job for me?

Thanks!
James

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Unread 06-15-2004, 05:07 PM   #2
pctech
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No ideas guys? Help would be greatly appreciated!
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Unread 06-15-2004, 07:17 PM   #3
Wooden Badger
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move the alternator out of the way and it makes it real easy to replace the thermo and clean the old gasket off.
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Unread 06-15-2004, 08:07 PM   #4
pctech
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Hi Wooden Badger,

Thanks for the tip! It sounds like you have done this job before. How long should the whole process take to do if the alternator has to be removed?

Thanks for any more help you can provide!
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Unread 06-16-2004, 12:33 AM   #5
94ZZJJ
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I didn't have to move the alt. I did it twice because the first pos unit stuck closed after a while, get the hd unit. 2 bolts, extension, new gasket, some rtv and drain some coolant first. Torque to spec. I replaced the factory clamp with a worm clamp.

Get a book!
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Unread 06-16-2004, 10:30 AM   #6
Jim Moore
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I did mine when I replaced the water pump. I seem to remember that I just pulled the hose up and replaced it. It only took a few minutes.
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Unread 06-16-2004, 01:15 PM   #7
acitydweller
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my thermostat was replaced recently when i had problems with the engine temp. you will need the thermostat and a new thermostat gasket for the install. The whole thing took no more than 20 minutes by my friend.
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Unread 06-16-2004, 03:57 PM   #8
Wooden Badger
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you don't have to take the alt out of the way. but for just having to take out the two bolts and sliding it out of the way it sure makes it easier to clean. my $.02.
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Unread 06-16-2004, 07:41 PM   #9
pctech
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Thanks for all the suggestions!!
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Unread 06-18-2004, 01:37 AM   #10
RockPaws
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Just make sure you clean the surfaces completly. Its not easy to get in there. If it comes out clean, all the better.

Also when was the last time the system was serviced? It may be time for hoses, flush, and new coolant. Don't forget about the bypass hose, its hidden under the a/c - alt mount assembly.
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