Bob -

In the past I've just unplugged the aux water pump and waited to see if the problem disappeared. At one time I tried to measure the resistance (ohms) of the failed aux pump on my old 123, but the results were inconclusive. The pump is currently on my 124 as well, but I've not tried to measure it. On the 124 simply unplugging the aux pump got rid of the blasting hot air problem. I've not replaced the aux pump; it just doesn't get cold enough where I live to bother.

- JimY