1971 Oldsmobile 98 passenger compartment fan issue

1971 OLDSMOBILE 98

85,000 MILES • V8 • RWD • AUTOMATIC

PATRICKOGLESBY

MEMBER
1 POST

I have a 1971 olds 98 with a 455 in it. My passenger compartment fan works fine with vent, heat, defog, and deice modes. As soon as I turn the ac on the fan does not work at all. The ac is fully charged and engages when it is turned on. Someone said they thought there was a relay for this issue but not for sure. I need to know if this is the case and where to look for it. If there is a part number would be great to know as well. Thank You.

Jun 30, 2015 at 10:20 AM

HMAC300

✓Experienced Mechanic
48,601 POSTS

see pics for diagnosis. the blower relay will look llike one being pointed to in pic it is normally by the resistor on evaporator box. these also had a fuse that was inline I think it's on the intake not sure with that as it's been so long for me to see one.

Images (Click to enlarge)

Professional Diagram for 2CarPros Members
Click here to log in and view diagram.

Jun 30, 2015 at 11:57 PM

THIS IS MIKE

✓Experienced Mechanic
686 POSTS

Patrickoglesby
June 30, 2015.

Thank you for your help. Every thing works now. It ended up being the in-line fuse.

Jul 1, 2015 at 6:24 AM

Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.