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Unread 06-15-2013, 09:27 PM   #1
creepingdeath94
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2000 WJ 
 
Join Date: Sep 2010
Location: port saint lucie
Posts: 147
'99 Limited runs hotter than it should (tried search)

Alright, I have a 1999 Limited 4.0 4x4. It tends to run at normal temp. on the gauge as long as Im driving along at a decent pace. However if I sit in traffic or at a drive through line it runs hot...gets up to about 230ish (3/4 on gauge) and holds there. It will sort of drop sometimes but not to a comfortable level until I start driving and holding a speed again and eventually gets back down to middle of the gauge and stays there.

Anyway, my question is could it be that fan is not being told to turn on at the right time...for example some sort of coolant temp. switch about to go or improperly sending signal to engage high speed fan until 235 or more likely a fan dying? Thermostat sticking? Or would thermostat cause hot temps. even at highway speed? Some sort of air dam not in place like on GM F-Bodies...they will overheat in traffic if the lower air dam is missing. Fan relay...or does that just not work at all if its dead? Is the mechanical fan enough at idle in traffic with A/C on in 90 degree summer weather to hold the temp. at 230ish or would it flat overheat if only the mechanical fan was working?

Sorry for the thousand questions but I need to fix this as south florida summers are hot enough and I don't want to risk actually overheating the engine. Thanks everyone.

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Unread 06-15-2013, 09:52 PM   #2
cykaaro
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Join Date: Apr 2012
Location: orangville, ON
Posts: 2,840
This is what my g/f started to do (where mine just plain overheated) Fan relay gone bad would be the first place to look. Because you have the mechanical fan could be the reason you haven't overheated.
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Unread 06-15-2013, 10:00 PM   #3
creepingdeath94
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2000 WJ 
 
Join Date: Sep 2010
Location: port saint lucie
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I will double check tomorrow probably to make sure the electric fan is definitely not coming on or is coming on at temp. I thought I heard it in the drive through line yesterday but it could have been another car echoing. Anyway, I was just trying to get some input before starting so I had a few places to look when I did finally have time to dedicate to figuring out whats going on with it, should I find the fan is turning on where to look versus if it is not to have a sort of game plan in place. Thanks for the reply.
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Unread 06-16-2013, 12:19 AM   #4
cykaaro
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Join Date: Apr 2012
Location: orangville, ON
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Mine runs real cool for some reason. Just about a full notch under half, unless I'm sitting in traffic. Once it hits almost the half way mark, the fan comes on. If it's below, it won't come on even with the air conditioning on. Open the hood and you'll definitely hear it if it's going. The fan relay though is under the passenger side light housing. Easiest way is to remove the housing and cut a whole through the header panel to reach it. If it really goes south though, it will throw a check engine code. I was always told the fan automatically comes on when the air conditioning is one. I'm now doubting that. Even with my AC on full blast, my fan doesn't come on until temp wise I hit about the half way mark. The first time I noticed something was off when mine went was caught in traffic on the highway behind a car fire, it hit the same reading as you did. Few days later and it went all the way up.

If the fan appears to be working ok though, then I'd start to think waterpump (is it leaking anything from the weep hole?) or if the rad has been in a long time, maybe it's somehow clogged and restricting coolant flow.

How old is the rad?
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Unread 06-16-2013, 08:18 AM   #5
creepingdeath94
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Location: port saint lucie
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I just bought this Jeep, so I have little history on it. The coolant looks pretty good and radiator appears to be in decent shape so Im guessing its relatively new. The waterpump is not leaking and I have proper coolant level and no seepage anywhere as I looked for that right away and when I first bought it during my "inspection". I am going to run it up to temp. and turn on the A/C and see if the electric fan comes on alright or not. I did notice that when it runs warm like this in tarffic sometimes midday the A/C seems to not work as well...so either I have two seperate issues or the high temp affects its cooling ability enough to feel. I have other A/C blend air door issues as well but thats another search/thread.
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