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Unread 09-14-2009, 08:08 PM   #1
solano4224
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1993 ZJ 
 
Join Date: Apr 2009
Location: colorado
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93 jeep grand cherokee overheating!!

alright I have a 93 jeep grand cherokee. The problem with my jeep is that it overheats.

Now, When I start driving it, Its a smooth ride but when the temp gauge goes above 210 degrees, My jeep starts to overheat.......

What is causing this problem?

So far I took it to a shop and they ran a dianostic test on the jeep. It came back as if nothing was wrong with it. So the mechanic suggested that I start to replace all the minor things that may cause the overheating.

Since then I've replaced the thermostat and it still is overheating.

Please help. The next part that I will be replacing is the temp sensor.

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Unread 09-15-2009, 06:30 AM   #2
impuresoul2k3
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Has the system been bled?
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Unread 09-15-2009, 07:36 AM   #3
savexourxship
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Assuming fan and relay are good?
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Unread 09-15-2009, 08:37 AM   #4
LordHobbit
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No relay on a '93.

I know it sounds asinine, but ... Is the cooling system filled? Is the mixture correct? Does it need to be flushed? What I do when I'm changing thermostats, is to fill the block until it reaches the thermostat, then I fill the radiator after connecting everything together. Anyway, make sure the thermal fan clutch is still good, if you are not sure, replace it. Make sure the radiator is flowing air well, you may need to steam clean it. You'd be surprised how dirty they can be. Report back.
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Last edited by LordHobbit; 09-15-2009 at 10:34 AM..
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Unread 09-15-2009, 08:51 AM   #5
erikksonb
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thermostats. hah. Buy one from a jeep dealership, it's worth it. The other ones you migh find in stores ( i got one of these non working ones at napa) online etc. May not have a small hole on the inside rim of the metal. This hole is to make sure it lets out the pressure in the air.

Water pump. Radiator flush? Fan clutch? Go to a radiator/cooling specialist they can help you out and get it done right.

Good luck
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Unread 09-16-2009, 04:25 PM   #6
solano4224
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what does that mean bled? sorry I'm not that mechanically smart. I was raised around technology rather than automechanics. do you mean bleed out the fuel lines?

as for the fan and relay. I'm getting ready to replace the thermostat sensor tonight. the customer rep over at auto zone said the thermostat sensor might be out. and that the thermostat sensor controls and tells the fan when to start.
the relay do you mean the fuel relay?

I was thinking that it may be the water pump. How can I tell that the water pump needs to be replaced? I dont want to waste 60 bucks on a new one if it doesnt need to be replaced.
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Unread 09-16-2009, 04:36 PM   #7
mpgumby
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I understand the technology versus automechanics thing, but grab a Chiltons manual or a Haynes before your man card gets yanked (assuming you're a guy). All joking aside though, if you're unsure of this stuff, don't just take it to a mechanic and drop it off, ask questions. Have them show you what they are talking abuot on your Jeep so you learn stuff. It's the best way.
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Unread 09-16-2009, 08:56 PM   #8
BigE3
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its a 93, thermostat sensor has nothing to do with it overheating. if its boiling over you have other problems.
#1 make sure you are topped off. #2 make sure your fan clutch still has resistance in play. the new clutchs are sold like this. #3 you said you installed a new thermostat but did you happen to maybe over rtv it and possibly covering the bypass port with rtv? #4 are any of the hoses collapsing? #5 bad water pump #6 depending on your mileage. possible bad head gasket. #7 how many miles on the exhaust system. is the cat new or is it clunking or rattling when you bang on it? and is the muffler rusted out? and other ideas mentioned in this thread
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Unread 09-16-2009, 10:07 PM   #9
impuresoul2k3
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Quote:
Originally Posted by solano4224 View Post
what does that mean bled? sorry I'm not that mechanically smart. I was raised around technology rather than automechanics. do you mean bleed out the fuel lines?

as for the fan and relay. I'm getting ready to replace the thermostat sensor tonight. the customer rep over at auto zone said the thermostat sensor might be out. and that the thermostat sensor controls and tells the fan when to start.
the relay do you mean the fuel relay?

I was thinking that it may be the water pump. How can I tell that the water pump needs to be replaced? I dont want to waste 60 bucks on a new one if it doesnt need to be replaced.
What happens if the system doesn't get bled, assuming you don't have the bleed hole, is that air gets trapped behind the thermostat and doesn't heat up to the proper temperature so the thermostat stays closed. Its like putting a HSF on a CPU without using the thermal grease.

When the jeep is warm, check to see if the upper hose is stiff and warm(meaning you have coolant flowing and a pressure buildup), also see if the lower hose is cooler than the upper hose(meaning the radiator is most likely doing its job, or at least not plugged).

BigE3-If the cat is that plugged, I would imagine he would see a loss in engine performance rather than overheating.
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1993 Grand Cherokee Limited, 5.2L
Modified/Slightly Ported Kegger
Air hat spacer
Modified Throttle body
Flowmaster muffler
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