Blower fan speed relay for '73 Cadillac?

[Bill Leverett]

I'm trying to trouble shoot a heater/ac blower fan speed issue. The fan will only blow at low speed. The Shop manual lists 4 potental reasons...one of which involves a failed "Auto" blower relay.

There are 2 relays attached to the evaporator housing in the engine compartment. One is the "Auto" blower relay, the other is the "Lo" blower relay.

Does anyone know what the part number is for the "Auto" relay? I can't find any markings on it. Is it the same relay as the "Lo" relay?

If this isn't the problem then I'm into the heater/ac programmer and/or the dash temperature control unit. Unless anyone has any further suggestions?

Thanks

Bill

 

[John ED Renstrom]

check the leads and there position. that will tell if they are the same or not. your after market ones sometimes won't have a numer on them.