Hi there,
I have a 1959 98 Olds Holiday Sceni-coupe.


When I turn the ignition on, the heater fan runs even when the heater fan is in the 'OFF' position.


I have replaced the heater control resistor.
I have now replaced the heater sensing unit.


I cannot see in the manual anything else to do with this problem.


Help appreciated.


Thanks


John.

 

Have you checked to see if there's voltage on both sides of the on off switch in all positions? You may have a bad switch ( there should be no continuity through the switch when off), and voltage is getting through. The other thing may be a bad ground letting voltage get back to the circuit.
Jim

 

Hi there Jim.
I will check that out.


Very nice car too by the way.


Thanks


John.

 

hi can anyone help ,we have encounted the same problem as you .our heater blower runs all the time . the vacume on/off masterswitch is ok. but we have power to both sides of the switch?has anyone solved this issue and what was the cause? thanks brad

 

If the switch is in the off position and you have voltage at both sides the switch is bad. Disconnect one side and see if the fan turns off.

 

Hi there,


By 'switch', do you mean the switch on the dash to control the heater fan or the switch on top of the heater blower under the bonnet?


Thanks
John.

 

hi ,thanks for your replys ,the switch i'm referring to is under the bonnet by the blower ,if i disconnect both wires from the switch,each one has power to it? thanks brad