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Old 09-17-2016, 10:22 PM   #1
Join Date: Jul 2013
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Coolant Filter

Traveling west on I40 approaching Albuquerque i noticed the engine temp start going up on the hills. It never got above 200 and would cool back to normal after the crest. It has always stayed at 180. As we climbed up to flagstaff it was running 205 and only cooling to 200. I stopped at a rest area, let it cool off some then checked the water and oil and they were normal. Climbed under and checked the radiator with a flashlight and as best i could tell it looked good also. We made it to Camp Verde ok and are in a nice RV Park,not a place where i can do any work. I'm thinking the coolant filter may be the problem. I drove the jeep to Phoenix and picked up 2 new filters and installed one of them. Have quite a climb back to flagstaff Monday. I know that a lot of you think that not too bad but this is not typical of my coach. What do you think?

2001 40' Diplomat
330 ISC
Towing 2015 Jeep wrangler

Eddie and Carol
2001 Monoco Diplomat
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Old 09-17-2016, 10:36 PM   #2
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Time to clean and flush the radiator. Ive had the coolant filters on for 35 years and not had a problem with overheating as a direct cause. You have a thermostat or a radiator problem in my opinion. Try cleaning then a flush. You have some time on that cooling system. The filters or filter is on the low pressure side of the system and should not be a big factor with the cooling unless its plugged

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Old 09-17-2016, 10:44 PM   #3
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The coolant filter will have zero effect on your overheating problem. This filter sees only a small slipstream of coolant. It could be plugged and have no effect in this regard.
As stated above you need to have the radiator cleaned to provide better air flow.
Could also be a thermostat problem.
Have a sample of the coolant tested before replacing it.
Dennis & Carol
2003, 4006, 41' DutchStar, Spartan, ISC 8.3L W/BanksPower - 2013 Honda CRV, BlueOx Baseplate, Aventa Bar & Patriot Brake. And the 04 Bird, Sunshine Car.
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Old 09-18-2016, 08:08 AM   #4
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Not familiar with fan/radiator system other then I know you have a rear radiator system. The most common problem with this type of system is a dirty radiator.

For your cooling efficiency to go down much that quickly is odd. What was your transmission temp doing. We went to Alburqurque last year and as we were driving in stop and go traffic climbing hills my transmission temp climbed quickly, before I noticed. I have a silverleaf system that gives accurate real time info. As soon as I downshifted to increase the temps started to go down.

The radiator is hard to clean due to the way it is mounted and stacked with other components (Transmission, CAC & Condensor). I've also read that debris gets stuck between components making it even harder to cleaan. Do some research on how to clean.
Jim J
2002 Monaco Windsor 38 PKD
2005 Jeep Grand Cherokee w/5.7 Hemi
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Old 09-18-2016, 11:23 AM   #5
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Those temps are fine but not normal for you. I would change the thermostat but put the old one and new one in hot water and bring them close to a boil. See if the old one is a bit slower.

For some reason folks seem reluctant to change a thermostat. They do not last forever.
Myron & Deborah
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