Fan Blower Speed

[Dale C.]

Dale

[Brad S.]

Re: Fan Blower Speed

Dale , there is a resistor on the front ( firewall) side of the heater box that reduces the current to the fan on the lower speeds. The power for hi speed is direct 12 Volts. I would think this resistor is the problem. Brad

[Dale C.]

Re: Fan Blower Speed

Brad
Thanks, I'll check it out.
Dale

[Dave S.]

Re: Fan Blower Speed

Brad
Thanks, I'll check it out.
Dale

Dale,
If it is like 1970 cars the left (assumed off) position does not shut off the blower motor. It does close the damper to eliminate air flow. Sounds like the damper is closed in the far two left positions.

[Dale C.]

Re: Fan Blower Speed

Brad
Hope it's not that resistor as its a 68 A/C only part and will no doubt be a bear to find (3929055). Maybe some electrical guru can rebuild it somehow.
Dale

[Dale C.]

Re: Fan Blower Speed

Dave
I'll check that out. Thanks
Dale

[Dale C.]

Re: Fan Blower Speed

I think Brad got it. Nothing works, duct doors, compressor or fan blowing, and nothing shown by amp draw until coldest positions is selected.

[Jim T.]

Re: Fan Blower Speed

The JM says the blower has a three speed switch for a 68 with A/C. The off is not a position, I assume, so it should have an “off - low – med – high” selection and be correct with the JM, or maybe just a off low and high. Here is my real problem, the first two positions have no air flow and only the far right position provides air flow. Also I don’t know what setting this air flow corresponds too. I guess there could be a problem in the actual switch or maybe in the fan itself and how could I trouble shoot this?
Dale

Dale you have two fuses that permit current to the blower motor. The high setting has its own separate fuse and it is not in the fuse block. It is located in the engine compartment and is in a inline fuse holder in separate wiring that will twist to unlock and remove the fuse. The other blower speeds current is through a fuse located in the fuse block. Have you verified that this fuse is good?

[Dale C.]

Re: Fan Blower Speed

Jim
All fuses in box were O.K.
Thanks
Dale

[Richard R.]

Re: Fan Blower Speed

Dale, there is also a high speed fan relay in that circuit if I remember correctly. I think the orange wire with the inline fuse terminates on that relay making it easy to find. Hope this helps Richard