2008 jeep wrangler 2.8 crd overheat - JeepForum.com

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post #1 of 6 Old 06-05-2013, 01:43 AM Thread Starter
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2008 jeep wrangler 2.8 crd overheat

Hi can someone please assist me. I have a 2008 Jeep Wrangler unlimited 2.8 l Diesel. It only has 45 000km on the clock. My problem is when i drive and there is a steep incline, with ir without a caravan,the temprature goes up 3/4 then the aircon disables and wast gate opens and i lose all power. At the top of the hill everything goes back to normal. The radiator is clean, I have replaced the wisco fan, Jeep sed it can be the atf oil that is dirty ir the level is to high ir low. I replaced the oil with mopar oil and level is correct, but the problem is still there

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post #2 of 6 Old 06-05-2013, 05:30 AM
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I wish I could help you. Unfortunately the diesel Isn't offered in the states, where most of us are located. That said if I had to take a wild guess, I would say it sounds like you have a computer issue.

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post #3 of 6 Old 06-05-2013, 06:28 AM
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Make sure the fan clutch is working properly, we have an CRD in a liberty, and same thing was happening, the fan clutch was worn out. Just an option for ya.
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post #4 of 6 Old 06-05-2013, 06:54 AM Thread Starter
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Already relpaced the fan clutch
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post #5 of 6 Old 06-05-2013, 09:38 AM
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The Jeep service manual states the diesel may run hot at low speeds and to turn off the AC. What speed are you going? The clutch fan pulls limited air at low engine rpm's and the condenser is also transferring heat into the radiator. At higher speed under load it is usually more a function of cooling system capacity, if you checked the t-stat, radiator, water pump, radiator cap, etc., than you may need to upgrade the system. If your JK did not overheat before under the same conditions than you need to identify what changed.

Is there anything blocking the grille? Is gear ratio and tire size stock? Is the system building pressure and are you losing coolant?

You might think about upgrading the radiator and installing an auxiliary electric cooling fan for low speed driving with AC on. I find some of the aftermarket fan clutches do not work as well as OE. With an electric fan airflow through the core is no longer dependent on vehicle speed.

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post #6 of 6 Old 11-17-2014, 12:26 AM
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I have a 2012 crd wrangler with the same problem, I went to jeep and said that there has to be some sort of fix so the researched it and found that the ambient temp in Australia is a lot hotter than most other countries and jeep now have a new fan cluch to suit and it was a good 80% better than before and I tow a camper.
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