SOURCE: My 61ar marvel is freezing even with thermostat on
There are two main causes for this symtom...
Bad temperature control or low freon condition.
A low freon condition is caused by a leak and evidenced by heavy ice build-up on the left side of the evaporator plate and no to very little ice on the right side. This has to be repaired by fixing the leak and replacing the lost freon.
There are two different control systems used on the 61AR...before 2000 it was an electric-mechanical thermostat that had a sensing bulb exiting the back and routed to the top center of the evpaorator plate to sense plate temperaure. The part number for replacement is 42240590
The second control consists of three parts, a control board (SSAC Control), thermsitor and potentiometer. The most common failure is the thermsitor which senses temperature at the evaporator plate and reports it to the control board by varing it's resistance. You can buy a replacement kit that has all three parts or just the thermsitor from the factory by calling 800-223-3900. Write me a reply note if you need futher troubleshooting help. The thermsitor part number is 42244531 and comes with replacement instructions.
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