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Old 11-11-2010, 11:32 PM   #1
JasonC3
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Default heater fan blower motor - 1971

My heater fan does not work on high but it works in the other settings. I substituted my relay from my 76 - but it did the same thing. Do you think it is a bad switch or is there anything else I can test? It really does not put out much air on these lower settings.
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Old 11-12-2010, 12:00 AM   #2
...Roger...
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Check the high blow fuse.
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Old 11-12-2010, 10:31 AM   #3
JasonC3
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Roger,

This certainly sounds logical but I don't recall seeing a "high blow" fuse in the panel. I will have anothoer look, though. Is it in the panel near the brake pedal, or in-line somewhere, or in another location? Thanks.
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Old 11-12-2010, 10:51 AM   #4
Peterbuilt
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Default Hidden fuse.

The fan high speed fuse is in line and under the drivers fender a little foward of the master cylinder.
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Old 11-12-2010, 11:57 AM   #5
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Quote:
Originally Posted by petes74ttop View Post
The fan high speed fuse is in line and under the drivers fender a little foward of the master cylinder.
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Old 11-15-2010, 09:50 PM   #6
JasonC3
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Thanks much! That was it. The fuse was OK but the fuse holder was not very good. I cleaned it up and it works but I will have to make a more permanent fix.
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Old 11-16-2010, 06:02 AM   #7
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If the fuse holder spring is good and the contacts are clean, you already made the 'permanent fix'. The fuse is there for a reason; don't try to 'improve' on it.
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Old 11-16-2010, 10:41 AM   #8
JasonC3
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Quote:
Originally Posted by 7T1vette View Post
If the fuse holder spring is good and the contacts are clean, you already made the 'permanent fix'. The fuse is there for a reason; don't try to 'improve' on it.
One of the prongs is worn down so the spring wants to push the cap to the side. I just planned to change the fuse holder.
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Old 11-17-2010, 06:08 PM   #9
STODD
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Does the fuse live in the same place on a 75, I have the same problem but have not found the fuse?
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Old 11-18-2010, 07:50 AM   #10
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Old 11-19-2010, 06:08 PM   #11
Bob Heine
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Quote:
Originally Posted by STODD View Post
Does the fuse live in the same place on a 75, I have the same problem but have not found the fuse?
That's where it is on my '72. There are several red wires connected to the horn relay, which is mounted on the inner fender well right next to the master cylinder. One of the thick (10-gauge) red wires has a fuse holder six inches from the connection to the horn relay. The other side of the fuse holder is a 12-gauge orange wire.
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Last edited by Bob Heine; 11-19-2010 at 06:28 PM. Reason: Add picture
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Old 11-19-2010, 06:08 PM
 
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