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Old 12-15-2018, 07:07 PM   #15
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I thought about that. Last time I cleaned it out was about a year ago. Maybe time to do it again.

Being a side radiator, it usually isn't too dirty, at least in my past experience.
Simple Green is your friend! I clean mine every year. (Just because I like to hang upside down through the bedroom closet hatch to spray the inside of the radiator and the fan blades! NOT!)
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Old 12-15-2018, 08:57 PM   #16
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Mine generally runs 178- 182.
Mine's never that low. Usually in the 190's.
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Old 12-16-2018, 08:49 PM   #17
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Mine runs 175 or less. Just had it serviced and it seems to run about 10 cooler than before. I watch it on my system monitor which is digital readout not the defaulted gauge Just ran 1200 miles watching it all the way. It ran from 155 to 170. Made me wonder why it was so cool......MH3000 with Cummins isl 400, 04 HR Imperial....
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Old 12-16-2018, 09:04 PM   #18
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Mine runs about 165. Got to 190-200 in the Rockies. Can’t recall ever seeing mine over 200 though. ISL400 with 3000.
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Old 12-16-2018, 09:49 PM   #19
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My temps run the same as yours. The trans will get up to 205° on long climbs and sometimes 210° when OTA is high. Both temps drop quickly on the downside when the exhaust brake kicks in and the fan spools up to 100%. I have the Isl 400 and Allison 3060.
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Old 12-16-2018, 10:24 PM   #20
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Do not have much faith in a lot of the analog gauges used by many rv manufacturers. Temps and pressures read off the ecu are generally more accurate.[like by silverleaf or scangauge]. A lot of motorhomes use engine cooling water to cool the transmission fluid. So it stands to reason that the transmission fluid temp cannot be cooler than the cooling water temp. when everything is warmed up. If my transmission oil temp is cooler than my engine cooling water temp, I would use my ir gun and shoot transmission oil temps on pipe or hose going into cooler, to get a good reading.
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Old 12-17-2018, 02:23 AM   #21
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I go off my ScanGauge and DIC. I agree with the statement that analogue gauges aren't accurate.
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Old 12-23-2018, 10:24 PM   #22
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3000 Allison Temperature

My dash guage is not accurate, so I only monitor the Aladdin Jr. Screen. Engine temp hovers at 195 if running but will cool lower if we stop. The trans will stay close depending if shifting or pacbraking. It does take longer to warm up and cool down. I have seen both in the 200s when rolling in the heat with the AC on. Remember the engine, trans, AC and CAC are all stacked in there and the oil driven fan may not be turning at the best speed for all. I have a squirted my radiators when washing rig but never "cleaned" them.

205 sounds high unless you were climbing or breaking. Maybe it needs a cleaning or at least a rinsing? Is your fan moving enough air?
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Old 12-23-2018, 10:30 PM   #23
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My temps run the same as yours. The trans will get up to 205° on long climbs and sometimes 210° when OTA is high. Both temps drop quickly on the downside when the exhaust brake kicks in and the fan spools up to 100%. I have the Isl 400 and Allison 3060.
Side radiator or rear?

I'm wondering why your fan would run faster because you have the exhaust brake on .
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Old 12-24-2018, 02:42 AM   #24
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Side radiator. I guess the ECM is programmed to spool up the fan to high when the Ebrake kicks in above 70% or more. On the down side of a climb my ScanGauge shows the fan speed at 90%. My engine and trans temps will drop to 175°- 180° very fast.
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Old 12-25-2018, 05:26 PM   #25
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Just be aware of where the device you are using to read the trans temp is getting its information from. Some electronic gauges that read off the J1939 are reading transmission sump temperature using the sensor inside the transmission. Many analog gauges read off a sending unit installed in the transmission cooler circuit. A sending unit installed in the line going from the transmission to the cooler reads the hottest temperature in the transmission system because it's the oil that is going out of the torque converter. If you are reading transmission sump temp, the reading you get is after the oil has already gone through the cooler.
For a worst case reading that shows what the trans oil is truly exposed to, reading in the to cooler line is best. For just looking at the temp of the trans itself, the sump reading is fine.
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Old 12-25-2018, 05:51 PM   #26
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After running for 6 hours today my engine, 400 isl, was running 183 and my trans mh3000 was running 145. This seems to be normal for me. Transynd and filter change about 2000 miles ago..
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Old 12-25-2018, 06:13 PM   #27
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Just be aware of where the device you are using to read the trans temp is getting its information from. Some electronic gauges that read off the J1939 are reading transmission sump temperature using the sensor inside the transmission. Many analog gauges read off a sending unit installed in the transmission cooler circuit. A sending unit installed in the line going from the transmission to the cooler reads the hottest temperature in the transmission system because it's the oil that is going out of the torque converter. If you are reading transmission sump temp, the reading you get is after the oil has already gone through the cooler.
For a worst case reading that shows what the trans oil is truly exposed to, reading in the to cooler line is best. For just looking at the temp of the trans itself, the sump reading is fine.
What he said. My ISC/Allison combo shows a trans temp in the 195 range. The trans temp is normally higher than the engine temp. I worried about the difference until I figured out the trans temp was coming from the sump, where the fluid would be the warmest.

One more thing....check your trans fluid level using your shift pad. The dipstick on my coach is not accurate.
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Old 01-03-2019, 08:28 AM   #28
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What he said. My ISC/Allison combo shows a trans temp in the 195 range. The trans temp is normally higher than the engine temp. I worried about the difference until I figured out the trans temp was coming from the sump, where the fluid would be the warmest.

One more thing....check your trans fluid level using your shift pad. The dipstick on my coach is not accurate.

Well.....not exactly.
Let me try this again. When the transmission temperature is being read at the TO COOLER fitting -THIS is the warmest part of the transmission system. This is the place where fluid comes out of the torque converter TO the cooler.

The temperature being read in the SUMP is AFTER the cooler, and is cooler than the readings at the TO COOLER fitting.
Even at 195 in the sump, this is well within Allison guidelines.


Allison max in the SUMP is 250 deg F.
Max at the TO COOLER fitting is 300 def F and will hit intermittent maximums of up to 330 if you have a transmission retarder.


There's always discussion comparing transmission temperatures debating if 175 good, is 165 better, is 195 too high.
Unless you are above 250 in the sump, or above 300 at the to cooler port, you're fine.
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