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1973 Eldorado Blower Motor Relays

Started by 50Cad62, April 16, 2020, 08:49:10 AM

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50Cad62

April 16, 2020, 08:49:10 AM
My 1973 Eldorado has two blower motor relays that I want to replace. Are they both exactly the same? Because one catalogue I have lists an "upper" and a "lower" relay, the upper being $20 more. Other places just list a blower motor relay.

"Cadillac Kid" Greg Surfas 15364

#1
April 16, 2020, 12:27:52 PM
The "upper " relay is the"auto relay" and the lower relay is the "low relay".  The auto relay sees substantially more current feeding the blower motor through the range of speeds while the low relay just "sees" low speed current.
They are both NO/SPST and the ones listed as "blower relay" seem to have a 25amp ratiing which is more than the 15 amp fuse in the blower motor circuit.
At one time there were two separate Delco numbers for the different relays but I believe it has been a long time since they were replaced by a single part number.
Greg Surfas
Cadillac Kid-Greg Surfas
Director Modified Chapter CLC
CLC #15364
66 Coupe deVille (now gone to the UK)
72 Eldo Cpe  (now cruising the sands in Quatar)
73 Coupe deVille
75 Coupe deElegance
76 Coupe deVille
79 Coupe de ville with "Paris" (pick up) option and 472 motor
514 inch motor now in '73-

50Cad62

#2
April 16, 2020, 02:57:02 PM
Thank you, nicely explained.
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