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Old 02-08-2008, 12:21 PM   #1
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2002 Winnebago Journey 36DL 330 Cummins has overheating problems at normal highway operating speeds when going up long interstate inclines. Coach pulls cargo trailer and has been weighed and is inside all weight limits. Engine service included steam cleaning radiator, changing all filters, diagnosing water pump pressure/flow and all hoses. Is there an aftermarket product to add cool outside air to radiator and reduce engine coolant temperature?
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Old 02-08-2008, 12:21 PM   #2
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2002 Winnebago Journey 36DL 330 Cummins has overheating problems at normal highway operating speeds when going up long interstate inclines. Coach pulls cargo trailer and has been weighed and is inside all weight limits. Engine service included steam cleaning radiator, changing all filters, diagnosing water pump pressure/flow and all hoses. Is there an aftermarket product to add cool outside air to radiator and reduce engine coolant temperature?
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Old 02-09-2008, 03:12 PM   #3
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Unless I've read the 2002 Journey DL brochure wrong, I would think you've got the 330 Caterpillar in your coach. I've extended the slobber tube below the frame and kept the radiator and intercooler clean and mine runs cool as a cucumber, even pulling mountains out West. My toad weights 4,700 lbs.

If your rad/CAC is clean, you are keeping your rpm's up on grades, you fan is spinning, and your thermostat is working, not sure what else it might be.
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Old 02-10-2008, 03:58 PM   #4
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Hi: THANKS for the response - YEP, I crawled under the coach and it's a CAT - painted all yellow and labeled. The selling dealer wrote it up as a Cummins and I just never checked. Anyway, I also observed the interior face of the CAC/RAD and noted caked dirt. I've scheduled a rad pull out and dip cleaning. I bet that will correct the problem. THANKS!
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Old 02-11-2008, 07:08 PM   #5
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I'm not sure that you need a pull and dip to get the radiator/CAC sandwich clean.

A few times a year, I:

1. Spray Simple Green(cleaner)on the CAC, paying particular attention to getting it outside the fan path in the corners.
2. Let it soak, untouched, for 30-40 minutes.
3. With a normal garden hose and a nozzle, spray both sides of the radiator/CAC, watching the run off.
4. If I am still seeing brownish residue wash off a minute or so into the rinse cycle, I let everything dry an hour or so and repeat the above steps. I've only had to repeat twice in a row to get clear run off pretty quickly in the second rinse.

Since I've been following this procedure as maintenance periodically, I don't seem to get the build up that I first discovered. I never have problems with overheating. Since the CAC is the first layer in the sandwich, I expect to see the temperature on the intake manifold sensor elevate first and monitor that.

My thought is that it is better not to take something apart unless it is absolutely necessary. Keeping the connections tight in the CAC airflow path is important and hard to detect when it isn't. Just my $.02.
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