The High Fan position on my 1978 Delta 350 is now dead, the other speeds are fine ..
I thought there was a seperate fuse or breaker for "Hi" , but looking in the owners manual I only see a listing for one 25A heater/AC blade fuse...
Anyone have any knowledge?

 

Do you have A/C? In my 69 there is a relay/resistor on the airbox under the dash that if it goes bad you lose the low and medium fan speeds.

 

I don't know about '78, but for earlier years, the main schematic only shows the non-A/C system. You have to go to the A/C section for the right diagrams.

Probably the high-speed fuse or relay is bad.

- Eric

 

Yes, I have AC, & "thought" there was a high speed fuse or relay, but there's no mention in the owners manual of a Fuse or breaker for "high" ...
Any ideas where I'd find it ?

 

I had a '78 Toro and if I remember right, there was a separate fuse for high speed on the fan motor. I think it was an inline fuse out under the hood, near the firewall--but that's been several years ago.

I've slept a few times since then...

Rockettruck...

 

On the older cars it's in the line between the big horn relay terminal and the high-fan relay, along the back of the engine.

Don't know about the newer cars, though.

- Eric

 

Look inside the car passenger side under the dash. If it's the same type of setup as the 69 it would be on the top of the air box. I don't know if you can get to it without removing some stuff but you should be able to at least feel for it up there.