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Old 05-12-2007, 10:59 AM
Arthur Dalton Arthur Dalton is offline
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Join Date: Aug 1999
Location: Florida / N.H.
Posts: 8,804
You have verified the low and high fan circuits w/jumpering the sensors/switches.. . Now you need to know if the 105 trips at temp for high fan.
But, on low fan you have verified the circuit by jumpimg the a/c pressure sw,. but do not assume that sw to be bad. It has to see a high pressure from the a/c system before it trips and many do not trip b/c the system is slighly low on refrigerant [ meaning high side never gets to trip pressure] . Gauges are needed here , or you can monitor the refrigerant eye sight. [ if yu still have the original R12]. Also be aware that the high side of a fully charged system will not get to sw trigger pressure if the ambient temps are low. The aux fan is just that---an aux air-flow when either the coolant gets out of line or the a/c sees a high thermal load...they both work when either system is being taxed ..they do not work until these conditions are met.

The strip you see may be the heater blower fuse...which would have nothing to do w.aux fan circuits.
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