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Old 08-29-2006, 06:26 AM   #1
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I have a 94 Aleegro Bay 36 ft DP with 230 turbo cummins allison 6 sp. I'm having a temp problem when pulling grades of 6% or more 4 miles or longer grades. I tow a 94 grand cherokee . the temp has not ever gone into the red or boiling point but higher then the norm. I gear down, an hold the rpm's in the 2100 to 2300 range, this works on shorter grades but not the longer ones. also this only happens in the 80's an higher outside temps. If this is a radiator problem ( I had an exhaust problem at the turbo outlet sometime ago an lots of sut an oil was blowing by the rear an the rear compartments) how is the best wat to clean the aftercooler an radiator an with what ? thanks an happy camping!
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Old 08-29-2006, 06:26 AM   #2
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I have a 94 Aleegro Bay 36 ft DP with 230 turbo cummins allison 6 sp. I'm having a temp problem when pulling grades of 6% or more 4 miles or longer grades. I tow a 94 grand cherokee . the temp has not ever gone into the red or boiling point but higher then the norm. I gear down, an hold the rpm's in the 2100 to 2300 range, this works on shorter grades but not the longer ones. also this only happens in the 80's an higher outside temps. If this is a radiator problem ( I had an exhaust problem at the turbo outlet sometime ago an lots of sut an oil was blowing by the rear an the rear compartments) how is the best wat to clean the aftercooler an radiator an with what ? thanks an happy camping!
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Old 08-29-2006, 06:54 AM   #3
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Tom, I'm assuming yours is a rear radiator, not a side radiator configuration. For my rear radiator, I spray Simple Green on the fan side, paying particular attention to get the spray around the fan blades and onto the perimeter. I've found going under my bed from both sides the easiest way to do that. I let it set for about 1/2 hour and then spray both sides of the radiator "sandwich" with a regular garden hose set to jet. I wouldn't use any kind of a pressure washer. I watch the water running off and if it doesn't run clear within a minute or so, I stop, wait for the fins to dry and then re-spray Simple Green and wait another 1/2 hour. I've only had to do the repeat procedure once because I try to do this treatement quarterly. If you don't drive in particularly dusty conditions as we do in West Texas, maybe doing it twice each year will be enough for you.

If you are successful, you should be able to shine a flashlight through the fins and see it on the other side. Again, the key is the other perimeter.

I hope this helps.
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Old 08-29-2006, 07:00 AM   #4
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I think the temperature rise you are experiencing is a normal one for a long grade with a heavy load, e.g. that Grand Cherokee on the back. By all means clean the radiator per chasfm11 suggestions, but I expect you will still see some temperature rise on long grades. As long as you can pull those looong hills and stay below the overheat (red) zone on your temp gauge, you are doing fine.
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Old 08-29-2006, 07:04 AM   #5
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Chasfm, yes mine is a rear radiator, an yes I do visit west texas, and my DW an I love the hill country! planning on coming that way again about jan of 07. And thanks for the info, I truly believe its the oil residue when my exchaust burned into at the turbo outlet for my whole back of the coach was oily an there was black sut even in the rear outside compartments, again thanks for the info
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Old 08-29-2006, 07:07 AM   #6
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thanks Gary, you guys are great help, an i really appreaciate an value your info
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Old 08-29-2006, 08:19 AM   #7
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One more thing to check Tom, especially since you have an older Cummins. I have had 4 now (as the DW reminds me) And on most of them there is a drain tube that sticks down just under the motor that slowly drips oil. It ventalates the crankcase, and is necessary to have.

However, on a rear radiator (like the one I have now) the wind rush under the coach, along with the rear fan pulling air up and pushing it through the radiator will clog the cooling fins slowly as you drive.

This could explain the change in running temps from what it used to be. The cleaning method is a good idea, and will probably help a lot. But also check for the location of the drip tube. Many folks on a different diesel forum that deals just with Cummins diesels (the Turbo Diesel Register- TDR) have extended and routed the tube to the back of the vehicle to eliminate the drip issue. It's cheap to do, and keeps the oily residue out of the air cooling stream.

Hope this helps,

Sarge
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