Question about 1998 Oldsmobile 88

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1998 olds delta 88 lost fan control, ac control, and rear window control all at once have power to fuses and tried differnt switch assembly in dash

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Ground terminal behind passenger kick panel should be checked. It provides ground circuit completion to much.
But, here's the beef. On my dads, i could punch the fan motor housing behind the engine in the midle of the fire wall and the fan would come on. Often going down the road it would also start blowing. The motor was not bad and as the plastic cover was crumbling due to its location over the exhaust i could have saved thecost of at least one of several motors and the trouble of fixing the cover with tin foil and weatherstrip adhesive. On the 1998 88 there was only one relay called the high speed relay. Number three from the passenger side, it is bi-pole. When the fan speed control on the dash is set to highest speed the voltage from the switch activates the relay sending ignition switch power straight to the blower motor through the high speed fan motor wire. All the other or lower speed settings on the speed control switch send voltage directly through the coresponding resistor block speed reduction resistances then through the normally off pole of the blower relay and to blower through the low speed wire, thus the three conductor connector on the motor. The resistor block and motor are the least likely to be the problem. With the key on and the relay removed a flat screw driver to depress the metal locktab under the relay to pullit, betension tab to install, then disconnect wire connector pigtail, pulling the first three relays may give better access to the pigtails and connector locks, Then jumper power to the two blower power wires to verify the motor fuction. Replace relay. My relay worked temporarily with new motors twice befor its contacts were to burnt to spinn up even the new motors and for lack of a decent schematic disected the entire circuit, rebuilt the the control dash panel fixxed vacuum leaks at vac reservoir and finally determined which relay was involved new resistor block and motor. It was the relay probably the entire time.

Posted on Dec 01, 2016

  • Tc Young
    Tc Young Dec 01, 2016

    There is also a fuse and relay panel behind the passenger kick panel in front of theECM this may be were the defroster relay is located im not sure i had to tape over the relay location sticker so that information eould not get lost from the sticker peeling. Verify power from ignition switch is getting to the ac selector and then the fan switch. I know the radio and the power windows continue to receive power after the key is turned off untill you open the door. I dont believe the fan or defrostor are powered through that modual.

  • Tc Young
    Tc Young Dec 01, 2016

    Oh yes, the ac selector switch knob had cracked and would not turnthe switch all the way through all the settings with out slipping hopefully anew one came on the panel or at least did not go unnoticed. I had to order one online as the parts house did not cary a suitable replacement

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The blower was blown in my Olds 88 when i got it. The blower is a common issue with olds, when they get old, ironically. otherwise, the ground, or the blower motor could be as well.

Posted on Apr 11, 2016

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This could be a GROUNDING situation someplace where it could be rusted away or loose or just about anything...first check the engine grounding to the frame then go from there...most are grounded to the heavy iron frame....

Posted on Jul 16, 2010

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It might not be a fuse that goes to that it might be a relay thats under your hood in the fuse box. Just a idea for you to try. Hope this works out for you.

Posted on Jul 16, 2010

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Here's the list and link for the fuse locations.

Fuse/Relay Locations on 1996 VW Cabrio.

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1. AC
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8. Intermittent wiper
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13. Radiator cooling fan
14. Starting interlock
15. Open
16. Open
17. Open
18. Daytime running lights
19. Auto trans
20. Open
21. AC & power seats
22. Power windows
Google Image Result for http://www.2carpros.com/forum/automotive_pictures/266999_cab_1.jpg

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