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Old 07-18-2021, 09:34 AM   #1
KPMullen
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Default 2007 Tour Master Overheating Issue

With just 50,000 miles on it, my 14-year-old T40-C (MBE 900 330 HP) is presenting with overheating issues. I power washed the radiator to make sure it wasn't packed with dirt. No improvement. I replaced both thermostats but the condition persisted so I replaced the radiator. Yup, still throwing codes (220 degrees) on even the most gentle of hills and even just highway grades.
I'd hate to think after all this it might be the simplest (and cheapest) of options... the sending unit/sensor or the dash gauge.
Has anyone else experienced this and if so what (if anything) caused/corrected it?
Thanks in advance (I hope).

Kevin
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Old 07-20-2021, 08:04 AM   #2
riverofcode
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I had an overheating issue with my 2008 T40c. Turned out to be a fan clutch failure. See my thread over in the iRV2 site. https://www.irv2.com/forums/f26/fan-...26-511817.html


I replaced my clutch with a spacer and new fan.
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Old 07-20-2021, 08:08 AM   #3
KPMullen
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Thanks, Scott. The fan clutch tested fine but obviously, something still isn't right. Kevin
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Old 07-25-2021, 09:22 AM   #4
miked
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Quote:
Originally Posted by KPMullen View Post
Thanks, Scott. The fan clutch tested fine but obviously, something still isn't right. Kevin
mine was the air filter
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Old 07-25-2021, 11:36 AM   #5
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Quote:
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Thanks, Scott. The fan clutch tested fine but obviously, something still isn't right. Kevin
Kevin,

When you tested the fan clutch, was that a running test where you actually hear it cycle on and off? I have a T-40A and it ran hot as well. The fan clutch was dead but still had issues after it was replaced. Turned out it was a bad relay next to the fan clutch. There are even relays on the 12 V panel on the curb rear of the coach.

Does it also run hot parked, flat and level driving, and/or hills?
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Old 07-25-2021, 12:32 PM   #6
KPMullen
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Phil,

It was a running fan clutch test. It only runs hot on inclines/hills. Cools off in seconds as soon as I stop climbing, on the downhill, level, or when parked.

Kevin
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Old 07-26-2021, 10:08 AM   #7
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Phil,

It was a running fan clutch test. It only runs hot on inclines/hills. Cools off in seconds as soon as I stop climbing, on the downhill, level, or when parked.

Kevin
Weird, it seems like you hit everything you need to. You replaced the radiator, the fan clutch is working and the thermostats are installed and I assume tested and correct.

On cleaning the cooling stack, I'm assuming you are 100% certain that there isn't still debris/dirt in there? I cleaned mine out with a pressure washer (safely) after I ran on 10mi of dirt road construction and started running hot again. Got out a lot - a LOT - but it was still running hot. Took it in to an Oasis Network (RV friendly) Freightliner shop and then had to steam clean it for 45 minutes until the water ran clear. THAT worked. Even though you got in there to swap the radiator, could it be possible that there was more gunk in there by the other coolers?
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