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Old 05-03-2018, 02:01 PM   #1
Wayne G.
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2001 L-Series 3.0L Sedan
1997 SL2
Default Blower speed control

I am getting blower function on all speeds "Except" high (#4) highest speed. Is that a separate circuit from the other speeds? IF so where is it fused or relayed?

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Old 05-03-2018, 02:34 PM   #2
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2003 L-Series 3.0L Sedan
Default Re: Blower speed control

Yes, high speed is a separate circuit. Check for a blown 40 amp blower fuse in the UHFB or faulty hvac blower relay in the LIFB (left instrument panel fuse box).

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Old 05-03-2018, 06:10 PM   #3
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2001 L-Series 3.0L Sedan
1997 SL2
Default Re: Blower speed control

Quote:
Originally Posted by fdryer View Post
Yes, high speed is a separate circuit. Check for a blown 40 amp blower fuse in the UHFB or faulty hvac blower relay in the LIFB (left instrument panel fuse box).
Will do thanks for the info.

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Old 05-05-2018, 12:53 PM   #4
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2001 L-Series 3.0L Sedan
1997 SL2
Default Re: Blower speed control

Did not find the high speed blower relay either in the R or L panel. There is a 40 amp fuse in the under hood fuse block but that's all. Could it be some where under dash as I heard a clicking sound from there prior to the high speed setting not working?

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Old 05-05-2018, 02:54 PM   #5
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Default Re: Blower speed control

For whatever reason that wasn't apparent until this thread, I never had to examine wiring diagrams to find out something amiss - no high speed blower relay in either left or right side fuse panels or main engine fuse panel yet one drawing shows a relay in the left instrument fuse panel. There are two drawings with the correct(?) one shown below, based on your info. The other drawing shows a high speed blower relay wired to the 40 amp fuse. Let's go with what you have (no high speed relay).

I highlighted the high speed (in red) 12v power feed for full blower speed that bypasses the resistor card. You'll probably have to examine the hvac control panel pinouts, orange wiring to the blower, and where this wire splices into the yellow blower wire. Somewhere in this wiring may reveal discoloration from overheating or burned/broken wiring. If high speed blower was used often, overloading this wire may have occurred.
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Old 05-06-2018, 11:41 AM   #6
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Default Re: Blower speed control

Great, many thanks, For the wiring diagram.

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Old 05-06-2018, 06:59 PM   #7
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Default Re: Blower speed control

You will probably find the orange wire burned off at the control head switch.

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Old 07-01-2019, 07:11 PM   #8
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2001 L-Series 3.0L Sedan
1997 SL2
Default Re: Blower speed control

It did turn out to be a burned connector pin on the switch, just cleaned it and was good to go.

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