Community Forums

dennismhamm · 05-30-2016, 03:36 PM

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.

SteveS · 05-30-2016, 06:39 PM

Sounds too hot to me. Is your fan running? If you are going slow, perhaps your fan isn't running and trans cooler isn't getting air through it to cool down fluid.

Old Scout · 05-30-2016, 06:44 PM

Agee --don't recall seeing mine over 200, maybe not over 180. Alpine went from radiator cooler to an inline coolant pipe config. at some point, late in the production run--not sure how that affects tranny cooling??????

dennismhamm · 05-30-2016, 08:04 PM

Steve, yes the fan is running. the trans fluid runs runs through the radiator not an external one.

dennismhamm · 05-30-2016, 08:06 PM

Old Scout, yes the trans fluid runs through the radiator. wonder if possible to put an external on the coach?

Old Scout · 05-30-2016, 09:58 PM

Recommend we try to figure out why your tranny is running hot rather than looking at after-market solutions. Need to get a few more "data points" from other late model Alpine owners on what constitutes "normal" tranny temps. Assume your Allison is running on synthetics [TranSynd]. When was fluid/filters last changed? Not sure why but guess radiator loop could be restricted????? Assume your Cummins is operating at normal temps when the high tranny temps occurred??

Koop · 05-30-2016, 10:33 PM

This seems abnormal to me. My trans temps run in the 170 to 190 range while cruising and even in mountain climbing. The only time they exceed 200 is when we are maneuvering the coach into a difficult site - going from D to R repeatedly and not getting above idle.

dennismhamm · 05-31-2016, 07:26 AM

Old Scout, The transmission was serviced about 8 months ago and the trans fluid was changed and it does have TranSynd in it. Water temps run around 200

Old Scout · 05-31-2016, 07:36 AM

If we can agree that 240+ degrees is too high--which I think we have--the other way to look at this is to decide whether we are getting an accurate reading from the temp sensor. The fact that your situation seems to be a one-off [ie, no one so far has reported a similar event], we should consider that the sensor might be wrong. Don't know how to diagnose and fix this from the owner's view point--seem like a trip to your local Allison shop is in order--IMHO.....

Janet and Todd · 05-31-2016, 10:17 AM

I've also noted transmission temps in heavy stop and go traffic as high as 230 degrees (one time event) which is well into the yellow zone on the Silverleaf dash monitor.

Dave Fernandez · 05-31-2016, 12:07 PM

I have never had a problem with high temperatures on the Transmission. Per the Silverleaf It runs in the 180’s and a long Hill climb or traffic it may get to 195º. It has never reached 200º in the 15 years I have owned it.

dennismhamm · 05-31-2016, 12:45 PM

Old Scout and Janet and Todd Legg, does you fan turn slow at idle or at high speed when temps are up? Is there a sensor that tells the fan to speed up or slow down?

dennismhamm · 05-31-2016, 12:47 PM

Old Scout, does the older models have an external cooler or does it run through the radiator? This is not a new issue with our coach but has been doing it when summer hits.

dennismhamm · 05-31-2016, 12:51 PM

Old Scout, when we had the trans serviced at the allison dealer about 8 months ago he took the coach on a ride with the computer hooked up to it and it did show the temps at around 235 and it matched what was showing on the silver leaf but he didnt seem to worried about it.