No heat or air.

JETT54

MEMBER
1996 OLDSMOBILE 88
185,000 MILES

Hello again. To refresh you, the blower motor will not cut on, defrost not working. We checked all fuses including the 30 amp under the hood. There is no voltage at the fan motor relay coil circuit. Doesn't that mean the switch on the dash is good? That would control the relay circuit that powers the different fan speeds, right? What comes before the relay in the coil circuit. I know it's probably a fuse right? What would that fuse be labeled as.

4 Replies

FIXITMR

MECHANIC
9,990 POSTS

Is there power output from dash switch?

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Sunday, December 18th, 2011 AT 7:15 PM

JETT54

MEMBER
9 POSTS

How do you go about checking if power is at the control ****s?

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Monday, December 19th, 2011 AT 12:58 AM

FIXITMR

MECHANIC
9,990 POSTS

Also the blower relay only works on HIGH setting. All other settings go thru switch and resistor assembly. The high setting draws too much currant for the switch so it uses relay on that setting to draw directly from fused supply. But check ground on blower motor too.

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Monday, December 19th, 2011 AT 1:05 AM

JETT54

MEMBER
9 POSTS

Is there any way you could provide us with a wiring schematic showing everything from the blower motor to the ignition switch? That would be cool. I know the problem is probably something simple. Thank you guys for everything, hopefully this is my last post. LOL.

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Monday, December 19th, 2011 AT 1:06 AM