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Old 06-06-2009, 08:18 PM
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Jeep runs hot

Hello.
This question is for my '98 Jeep Cherokee 4.0L fuel injected engine, 4 speed automatic w/overdrive, and 4WD with 156K miles on it.
This particular vehicle was bought from a goverment auction, and has the police package. A sheriff drove it for a whlile. I just bought this a couple of months ago and have put the following new parts in; U/L ball joints both sides, steering box, thermostat (195degree, water pump, U/L radiator hoses, serpentine belt, flushed radiator (twice) with 50/50 mixture of radiator fluid and distilled water.
The problem is that on hot days the temperture gage starts to creep up to the 210 degree region. If I am moving it has stays at 195 degrees with no problem. I have not overheated yet or got a high temp warning light, but just wanted to know if there was anything I could do to keep the temperture down when I am sitting in traffic on a hot day?
Any suggestions, advice are very much appreciated and welcomed?

Thanks,
Robert

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Old 06-06-2009, 10:26 PM
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210 is normal for newer engines, 220 or even 230 isn't uncommon. I would try and see if it will climb much over the 210-220 degree range. It is entirely possible that it will stop rising. One thing to consider, though, is the condition of the rad. I know you flushed the coolant, but did you happen to look through the rad with a light? The fins could be partially blocks, and not allowing enogh heat transfer when stopped. Spray it down with degreaser (engine shampoo works) and wash it out with a pressure washer set up on medium pressure. You'll probably be suprised at the amount og crud that will wash out.
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Old 06-06-2009, 11:20 PM
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Since you have a 195F thermostat and your jeep cruises at 195F it stands to reason your radiator is working under high air flow conditions.

If it has an electric fan; what temp does it kick on?

Some cars have electric fans which do not kick on till well over 200F.
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Old 06-06-2009, 11:45 PM
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Quote:
Originally Posted by newdad1
on hot days the temperture gage starts to creep up to the 210 degree region. If I am moving it has stays at 195 degrees with no problem.
I have a '97, same engine. I see a maximum of 195 degrees F, day or night, summer or winter, A/C or heater on or off. Same temp no matter what. The radiator is new, before that, it cooled the same, my radiator sprang an irreparable leak- that's why I replaced it.

If your temp rises after idling for a while, it's likely not getting enough air flow through the radiator. If there's nothing in the way of bent fins or bugs, grass, weed seed, etc. blocking the flow, and your fans working OK, the radiator could be on its way out- or just the differences between senders and/or thermostat could show that much variation.

If it were me, I'd keep an eye on it and if it got no worst, I'd quit worrying about it- but it's your call.
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Old 06-07-2009, 07:52 PM
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It does have an electric fan but it has not kicked on yet. I don't have an owners manual so I could not tell you the temp that it is suppose to come on. For the record, the VIN number is 1J4FJ68S4WL173795 if that helps. I bought this from my uncle who even made a comment on how clean the radiator looked on the inside. I will try the pressure washer set on medium and see if that helps.
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Old 06-07-2009, 11:13 PM
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Your need to verify your electric fan kicks on.

After driving the car let it idle for several minutes. When the engine starts getting hot the fan must kick on or else you must fix the electric fan.
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Old 06-08-2009, 05:03 PM
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The fan relay is a common issue on those. The fun part is it is burried. You actually have to cut a hole to replace it. If I remember correctly it is behind the bumper cover on the passengers side.
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Old 06-08-2009, 06:11 PM
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I checked the fins and there is some debris between them; mostly bugs. On this model I think its the evaporator that is in front of the radiator. The smaller tube(hi pressure) comes out of the compressor and feeds into this unit in front of the radiator. I will clean this out tomorrow and and verify that the electric fan comes on, then check the relay if the fan does not come on.
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Old 06-08-2009, 06:14 PM
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Quote:
Originally Posted by newdad1
I will clean this out tomorrow and and verify that the electric fan comes on, then check the relay if the fan does not come on.
I can tell you the fan's coming on- but check it, anyway.

Cleaning the fins (both the rad, and the condenser) will be what helps, providing the cooling system's up to snuff.
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