[mycbarnes]

Thank you David for the information. I'll look at the reservoir  again for a temp sensor, as that makes the best place to capture a reading. The system is very important to have operating and with the location of the heat exchanger buried under the coach, it's something everyone should be aware of working and if it isn't, it's a silent killer as there is no dash warning or parameter in vmspc. If the hydraulic fluid gets too hot, it will get thinner, the hydraulic pump could gall and fail. Same for the hydraulic motor that runs the radiator fan. The failure of the heat exchanger for the fluid could chain react to a failure of the radiator fan system. Then, well, even worse. I just got our coach in May, I have been getting it ready for our first adventure from Tx to Airventure in Oshkosh. First day on road I am going to see blistering Tx heat. Trying to think of all the systems to check before hand.