Thank you bob nestor for the prompt reply..I had forgotten the importance of the thermistor..I think mine had fallen out of the plastic keeper..I replaced it and moved it over two fins to the left to the top..the temp has fallen 10 degrees in the past hour..we were tuning up to go to Camping World for a new reefer..thanks again for the help..We are at SHADY CREEK RV PARK Aubrey Tx, it is a very nice place. I also installed a fan at the back to help move air up...Thanks again for your kind help.I will read the article you wrote..