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Old 05-31-2016, 01:39 PM   #15
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Don't believe temps should ever reach 235 unless extreme conditions exist. Like Old Scout said, we need to make sure your instrumentation is accurate. False readings can send us down the garden path. If you have an IR temp gun you might try aiming that at the pan of the tranny when it registers so hot...that will give a pretty good indication as to whether the instrumentation readings are near accurate. I suspect instrumentation is not correct since the Alpine trannys seem to run about the same temp as the engine coolant.
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Old 05-31-2016, 01:45 PM   #16
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While Transynd is a full synthetic, and therefore better to deal with the heat, your temps are definitely higher than they should be. The heat from the stop-and-go should not be as high as you are seeing. It seems once you get adequate airflow, then temps come back to a normal range, so the key is airflow.
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Old 05-31-2016, 02:56 PM   #17
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38Chevy454, what would cause not enough air flow? i have washed the radiator good and doesnt look like its clogged with dirt or anything
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Old 05-31-2016, 04:44 PM   #18
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Hard to explain how, even harder to do, but you need to make sure your engine fan is functioning correctly. The fact that tranny temps eventually return to "normal" suggest that maybe an external issue is in play--Allison trannies are pretty much
"bullet-proof." Usually, a fan controller will fail with fan wide-open, so air flow wouldn't be an issue in that event....
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Old 05-31-2016, 05:00 PM   #19
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Old Scout, i just put a new fan controller on the coach last week. and now when traveling down the road you can here the fan speed up and slowed down temps come down. The old controller had the fan stuck wide open and the trans temp never got above 178
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Old 05-31-2016, 09:01 PM   #20
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Dennis, don't take this as smart ... It is not intended that way, but if you had no temp problems before you changed the fan controller, now you are seeing temps too high, why not put the old fan controller back in. It will cause the fan to run on high all the time, but does that really matter?
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Old 05-31-2016, 09:33 PM   #21
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DrDaveMA, The trans has always had temps this high when in heavy slow traffic during the summer time. when the fan controller went bad and was stuck wide open the trans temp never got over 178. when i put the new controller on the the trans temps went back to the higher temps.
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Old 05-31-2016, 10:13 PM   #22
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Originally Posted by dennismhamm View Post
going through cities at a stop and go real slow for long periods of times our trans temp will climb to around 243 degrees and when back up to normal speeds the temp drop back down to normal range. Is this normal?Also this is in around 90 degree weather. Thank you for you help.
sounds like your fan clutch is failing. I have a p30 chassis with toad, 15k gvw. Normal tranny temp is 165, engine temp 193. Down town vegas recently on the interstate 15/515/93/95, ambient temp outside temp was 114(entering engine radiator). Engine temp went to 220 with dash AC on. Trany temp went to 190 in the stop and go traffic for 10 miles. When traffic cleared, ambient dropped to 98, engine temp dropped to 193, tranny temp dropped to 180 for quite a while then settled down to 165 again.

Tranny temps as a rule should not get over 220 when going up a grade towing. The rubber O-rings will harden and eventually fail. Besides your fan clutch, test your radiator cap and clean the fitting it fits into so the rubber seals are can work correctly. Sounds like your thermostat is working correctly but
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Old 06-01-2016, 07:54 AM   #23
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No fan clutch on Alpines--since engines temps remain normal, need to continue to focus on tranny cooling....
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Old 06-01-2016, 09:28 AM   #24
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Dennis - I still think you should independently check the temp of the tranny rather than assume your instrumentation readings are correct. As in my previous post, borrow or purchase an IR temp gun (you can get them for under $25) and shoot the tranny pan when it is hot and see if the temp readings agree with each other. Make sure you are not chasing a phantom problem and confirm your instrumentation is correct...it could explain everything you are seeing if the readings are higher than actual conditions. For example, with your old controller in and the fan ran full speed your tranny temps were 178 at the highest. Going slow with full fan would probably give tranny temps far lower. The reason engine coolant temps may have seemed normal under those conditions is the thermostat provides throttling for the engine coolant so a full speed fan wouldn't necessarily "over cool" the engine...the tranny coolant isn't throttled and may actually be running at 120-130 under those conditions. Really think you need to verify before spending tons of time "fixing".
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Old 06-01-2016, 09:45 AM   #25
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SteveS, i ordered one today and will check that out. when im cruising down the road i can here the fan speed up and the temps will drop. as temps rise again when the water temps get to round 209 degrees the fan will speed up and drop the water temp to 198. when i come to a stop the fan turns slow and never speeds up. wonder if this is why the trans temp climb when at a stop and go slow speed when in heavy traffic and its hot out side
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Old 06-01-2016, 10:40 AM   #26
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Originally Posted by dennismhamm View Post
going through cities at a stop and go real slow for long periods of times our trans temp will climb to around 243 degrees and when back up to normal speeds the temp drop back down to normal range. Is this normal?Also this is in around 90 degree weather. Thank you for you help.
dennismhamm
According to my "chassis owner's manual", normal Allison transmission fluid temps should be between 140 degrees F and 290 degrees F.

However it also states the following:
"This temperature will vary under more severe conditions. Under cool conditions in higher gears when driving on level ground, it is not uncommon for the gauge to read under 140 degrees".

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Old 06-01-2016, 01:59 PM   #27
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Dennis - Yes, your engine coolant temperature is a function of fan speed and thermostat opening (amongst other fixed cooling design criteria). When running under low-load (slow moving) engine will run cooler and fan will slow down. However, under these conditions tranny temps should also be lower (normally lower than the engine) that is why I have to question your tranny temperature gauge (instrumentation). If your readings really are correct you need to do the hard part, figure out how the tranny is actually cooled and/or if there is something wrong that is causing it to get so hot. Temps should get to 250 only under extreme conditions, and not stay there very long.
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Old 06-04-2016, 04:04 PM   #28
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Recent trip temps.

Trans temp after going over Snoqualmie Pass Thursday morning. Outside air temp 51 degrees. We stopped in Easton WA and let the engine idle.

The second photo is after letting it run at idle for 10 minutes. These temps are our "normal".
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