I found this awesome write-up on changing the heater core and/or blower motor on our trucks. I've posted the link before, but the page has moved. This is the new link:

NORTH COUNTRY SPECIALTIES ®

Perhaps a site admin can make it a sticky or include it in the tips at the top of the page

I will add this note: there is a bolt holding the bottom of the dash to the side of the truck. Pull that bolt, and you can rock the dash up an inch or two. Makes a big difference!

 

Thanks for posting! My 1974 F250 w/ ac needs a b motor.

 

Here is another good one. 1979 F100 Air Conditioning

 

Thanks for posting. He must have done his "Master's Degree" Theses on Ford F250 AC!

 

Here is a short cut. https://www.ford-trucks.com/forums/1...otor-hack.html

 

Thanks for posting. I located that shortcut, last night.

I noticed the AC box "cover" in the engine compartment of my 1974 F250 is held on w/ nuts/screws. I figure someone R&R-ed the blower, previously. It needs a new blower and I am gonna pull the cover today or tomorrow.

I'll advise how it went, when completed.

 

The guy's name is Trent and he used to go by the name InfoFord on various forums. Haven't heard from him in a while.

Yes, pulling that lower dash bolt makes it a tolerable job instead of a miserable one.

 

Thanks for posting.

I R&R-ed the AC/heater blower on my 74 F250, from the engine compartment. It was, I'm sure a great time saver. Took me approx. 2.5 hours, including vacuuming the AC box, spraying the evaporator w/ cleaner and making a new blower to case gasket (used light, self adhesive, foam weatherstrip)

 

Hoping someone still reading this thread. I've got problems with my blower motor and have dealer installed A/C with the control slide in the center under the temperature control slide. Not sure what status that means, but heard it makes a difference.
Reading through I think I've gotten myself confused. Are there two blower motors for this type of AC or just the one? Attached a photo and I know it's crappy but hoping it shows enough to get some answers!

 

 

Yeah, I think I'm going to go the route of through the engine compartment way if I have to replace the motor. Going to try and find the connection to the motor first and measure what's going on because it's weird that the motor will run when the ignition is off and then stops when the ignition is on. I would like to get it back to different speeds as well but really am not that fussed about it. British dude living in Florida, it's either not on or blowing a hurricane that's needed!

 

Just a quick update. Managed to get my way through the electrical drawings someone pointed me back onto and after rewiring half behind the dash, I've got everything back working again!
PO butchered the wiring and there were some loose connections but more importantly there was a direct keyed 12v to the lone pin on the resistor, accessory safety relay was fried and fusible link in the engine compartment feeding the relay was done. Got everything replaced and I've got the fan running on all speeds.
Might seem like a small victory, but it's a victory nonetheless!