Changing Defrost Vents?

[Farmall]

Loooong time since I've been here.
My question is, has anyone ever changed or modified the defrost vents on the dash?
My existing dash is in horrible condition (with an LMC cover that warped all over) and I figured I couldn't do any more damage to it.
So, I am looking into cutting and installing a longer vent to help get the air across the windshield.
I figure I can repair the foam and recover the dash.
Any ideas?

[jzjames]

Is something blocking the 2 vents? I havent seen defroster vents much better than the ones on our trucks.
Maybe source a better stock dashpad?
Is the LMC cover distorting the airflow?

[basketcase0302]

"Farmall"]Loooong time since I've been here.
My question is, has anyone ever changed or modified the defrost vents on the dash?
My existing dash is in horrible condition (with an LMC cover that warped all over) and I figured I couldn't do any more damage to it.
So, I am looking into cutting and installing a longer vent to help get the air across the windshield.
I figure I can repair the foam and recover the dash.
Any ideas?

Yes it has been done!

I've seen two different guys here over the years "graft", (because it requires cutting into the metal portion of the dash) dent era 73-79 defroster ducting (like pictured below) into the dash assembly. I can never get the search engine here to work anymore, (most folks say google finds Fordification searches but it never seems to work for me) as you'll find topics on the conversion. The bump era defroster vents were poor in design to start with as far as I'm concerned. but keep in mind you can help the defrost tremendously by upgrading to the dent era blower motor assembly, (which requires a lot...less modification to increase the airflow.

[Farmall]

Yes, the LMC cover is part of the problem.
I have had several pre 80's Fords and the small vents don't spread the air like a wider vent.
I have never heard of upgrading the motor.
How is it better?
Thanks

[jzjames]

You have the 2-speed blower motor, right? Low and high.

[sargentrs]

I have never heard of upgrading the motor.
How is it better?
Thanks

You swap the motor from an 80s Jeep Wagoneer and the squirrel cage from a Granada. The motor is faster and the squirrel cage is bigger. This combination increases air flow quite a lot.
http://www.fordification.com/forum/view ... hp?t=73960

I also plan to use the existing defrost vents but cutting a hole in them and installing A/C vents from a 2000s F150. A little larger and they can be rotated and tilted to direct the air flow. Like the ones below. Going to use larger diameter vinyl flex hoses used in the woodworking dusct collecton systems. Like this https://www.rockler.com/power-tools/dus ... 252F2$2522

[Farmall]

It is a three speed fan.

[jzjames]

I’d be looking at the dash cover or some kind of leaks or blockage in the underdash hose ducts and flaps.

The defroster on my ‘67, (2-speed motor), blows hard and hot and clears the windshield quickly. And that is with the flaps that have lost their little gasket seals.