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2000 grand cherokee overheat and high oil pressure

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Old 08-12-2017, 04:56 PM   #1
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Default 2000 grand cherokee overheat and high oil pressure

Hi i am from baghdad - iraq and Air temperature above fifty........

My 2000 grand cherokee overheat only when Turn on the air conditioner and stop moving for more than a quarter of an hour ...... After the test I discovered that the thermostat does not exist ..... and that the water pump is working well and the cooling fan works as well

Does the heat rise cause no thermostat ?????


Another thing that worries me is the high oil pressure its 80, when the car starts up and after the car heats up the oil pressure becomes 50 As the attached pictures...

Greetings and thanks







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Old 08-13-2017, 11:01 AM   #2
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Welcome to CF!

Without a thermostat, the coolant is flowing thru the radiator too fast to give off it's heat. The restriction of the thermostat slows it down enough for the heat transfer to work. Sitting and idling, the only airflow is the fan. Remember that the heat given off from the A/C condenser in front of the radiator pre-heats the air going thru the radiator. I'm surprised it lasts 15 minutes before it gets hot!

The high oil pressure might be a bad sensor. To know for sure, install a mechanical gauge to check. It might be too thick oil as well. 10W-30 is the best weight for all climates. Jeep recommends 5W-30 for temps from 0*F up to 100*F, but 10W-30 is fine because your climate never sees 0*F. A heavy oil, like 20W-50 will raise the pressure substantially. The bearing clearances in today's engines are designed for thinner oils to reduce friction and drag. Jeep says 10 pounds of pressure is enough at idle, but that scares me!

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Old 08-13-2017, 04:27 PM   #3
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Your words are very useful and correct .... Very thank you for the speed of your response .... What is the best temperature of thermostat Is 82c good ??
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Old 08-13-2017, 05:04 PM   #4
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That would be a 90*C or 195*F. That's the temperature the computer requires for best fuel trim (Mixture). Normal operating range is 90*C to 99*C. (195*F and 210*F)
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Old 08-14-2017, 03:43 AM   #5
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I am very happy to talk with you ... I have benefited from your advice a lot
Excuse me for my many questions ... but let me ask the last one

Is the measurement of voltages low ?? in gauge above ?? I notice raising of voltages and increasing in brightness of the front lights of the car when pressed on the gas pedal
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Old 08-14-2017, 05:24 AM   #6
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Yes, I thought it was a little low. The volts are controlled by the computer, but the alternator may be worn out. The volts should be 13.75 and your gauge is showing battery voltage which is normally 12.5 when it's fully charged. The alternator may need new brushes and the contact rings polished, but installing a new or rebuilt one is better. You should have it tested before spending money.

You can ask all the questions you would like. That's what the forum is for.

Let me ask you a question. What engine do you have in it?

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Old 08-14-2017, 06:50 AM   #7
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I thank you for your interest and very grateful for the useful information you provided me

i have 4.0L V6 cylinder

and this is my jeep


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Old 08-14-2017, 09:26 AM   #8
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That's about the most reliable engine Jeep ever used! That's why I bought one myself. This is my Jeep;
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Old 08-14-2017, 09:28 AM   #9
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Check out wjjeeps.com for lots of good information about this model.
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