We decided to take a trip in the old Countessa to Colorado. Driving across northern TX, the silver leaf jumped to the coolant screen when it hit 215, it climbed up to 220 for a few seconds before I could get it moving back down. Finally got it under control and checked the fans speed controller, coolant, etc at the next stop all was good. The next day we moved on to Pueblo and it hit 218 on the biggest climb, I don’t drive these inclines much so I’m still figuring out what gear I should be in. It seemed to stay the coolest when I would get the rpms around 2000 - 2200 on the climbs.
Got to a fuel stop and decided to check the trans level got the dreaded ol -95 message, then when we get to the campground, I crank up after registering and the check-trans light is on. After a minute or so it let me shift into get and got me to our site. The diag code said 22 14, issue with Input speed sensor. I crawled under the coach today and tested the resistance on the input speed sensor, it was in range. So I pulled the big transmission connector apart cleaned all the contacts with alcohol, put it back together and the oil level sensor is working again and the input speed sensor error is clear. If your servicing your Allison on a 15 year old coach, I’d recommend cleaning that connector.
Safety related, I have some 3” steel pipes I can sick between suspension areas with the air bags inflated to make sure I don’t get crushed under the motorhome. They are also handy for holding the coach up while you change an air bag, that’s what I made them for.
I plan to replace the thermostat and coolant next week to hopefully fix the engine temp issues. The side radiator looks pretty clean, but it’s really hard to tell for sure. Any advice on how to clean it, or other things I should check that could cause the engine temp to get so high. We have been to CO before, and never had temp issues.
One last issue, the dash oil pressure gauge, sometimes the hand goes max off the scale, but the oil pressure has been fine when checked with Aladdin or the silver leaf.
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Granville Barker
2005 Dynasty Countessa