Thanks for the advise, The fan operation is not electric it runs on fluid thru a pump system thru a housing in the front of the motor with its own resavoir with a solenoid & relief valve, so far we have eliminated the computor but have found that the solenoid has 12 volts going into it & should have 5 comming out but is showing only 1 volt output, hopefully withj more testing we can find if this is the problem.