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Why does it overheat???


 
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94BGCherokee
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Joined: 22 Jun 2006
Location: Saint Louis, MO

PostPosted: Sun Jun 25, 2006 10:14 pm    Post subject: Why does it overheat??? Reply with quote

Ok, so I am new to Jeep Horizons and made one other post. As far as cooling is concerned my radiator crapped out. So with that I decided to put a new 3 row all copper core radiator with new water pump high flow thermostat housing balanced 180 thermostat from mr gasket, added a tranny cooler. I live in Saint Louis and the car runs great when its moving but with air and sitting at a light it gets to 210 and then some, whihc is normal, I havent replaced the fan clutch b/c its not that bad, but will it make a big difference? I know it gets hot and humid but is that normal, and also i was in the country with no a/c and she was getting over 210 about 230 actually and the electric fan would kick on but i was told they dont kick on until 210. Are my gauges off, do I need new temp sensors, I know its not getting into the red but with all the mods it should stay cooler.
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pipxj
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Joined: 22 Jan 2006

PostPosted: Mon Jun 26, 2006 1:01 am    Post subject: Reply with quote

I swapped to a 160 degree thermostat in my XJ when I replaced the radiator. It's running cool as a cucumber now.

It's supposed to cool down a bit this week anyway...
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Ricko70
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Joined: 30 Mar 2006

PostPosted: Mon Jun 26, 2006 3:30 pm    Post subject: Reply with quote

Fuel injected engines are supposed to run at about 200 or there abouts.
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ThePhantum
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Joined: 23 Jan 2004
Location: I knew it...I'm surrounded by Assholes!

PostPosted: Mon Jun 26, 2006 4:19 pm    Post subject: Reply with quote

The computer will kick on the electric fan at 218 degrees or whenever the AC compressor is running.

Unless you replace the stock fans (mechanical and electric) with some high CFM units, in hot & humid weather it will push 220, regardless of what mods you have. (FYI, I have all the same mods on mine)

It should also be noted that the thermostat temp will have no bearing on the max temp the engine will run. That is only the temp that the thermostat allows full coolant flow. A lower temp thermostat will only force the engine to take longer to get to operating temperature (which is right around 195-200 degrees). Since the computer runs the engine a little rich until it gets to operating temp, all that's really accomplished is forcing the engine to burn more gas that much longer.
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RockOn
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Joined: 04 Mar 2006
Location: Murfreesboro, TN

PostPosted: Mon Jun 26, 2006 7:22 pm    Post subject: Reply with quote

The things you listed should do the trick.

But to add to this thread....

I have heard it is not good to put a drastically lower thermastat in. From the factory they use a 190 degree. So think about it....it works fine for years....then you start over heating. Hmmm....something has changed. The quick fix would be to put a lower degree thermastat in. But your not fixing the problem, your changing the performance of the vehicle. Probably lowering your gas mileage (possibly lose of horse power to) because your not running as hot. Your computer works to get the temp up also for max performance.

So in my opinion.... don't try to compete with the engineers that designed these vehicles. I do agree with upgrading things like the radiator with a 3 row, the balanced thermastats, and high volume water pumps. With these things your not really reengineering the operation of your vehicle (or confusing your computer).

I do run a 180 degree thermastat right now. I'm actually going to go back to the 190 degree though (balanced of course). I have been running to cool in the winter.
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