Blower motor fan speeds

I’m writing this because I want to change my blower fan speeds.
I know that position 4 is straight battery voltage (WFO)
Any detent less is run through a resistor. The slower the fan speed, the more
Resistance. (More heat also)
I’m not happy with the first 2 settings. They are not enough flow.
Position 3 is good but noisy. Position 4 is very noisy, but effective.

I tried a exact same size blower motor resistor unit that is for a MercedesBenz of 5he same
Year. It physically fits, but does not wrk the same. Position 1 and 2 are better flow, but there is no change between 1 and 2.

I have cleaned the evaporators box to shiny clean. There is no blockage.
Just wanting better flow down low.

Anyone else try this?

 

Sorry, I don't know the answer to your question, but how difficult was it to clean the evaporator? I think mine is clogged, or something... seems like a cup of water drains out of there every minute.

 

If you take out the blower resistor, you can look right in there.
I used Home Depot quality of home Air Conditioner “coil clean”
It foam up inside box like shaving cream. Then I used a garden hose to flush out.
Let it sit and loosen dirt for 5 minutes.
Should drain out the evaporators box drain.
MAKE SURE IT DRAINS!!!!
roll the hose between your fingers to loosen up the crustys and goo.
Should pour water out when it’s clean.

Gets rid of AC skank smell also.

 

Check out this page for pics on the how to. Start at post #7.

https://www.tundras.com/threads/the...vestment-‘build’-a-chronological-story.46816/

Couple drops of pneumatic oil on both ends of the blower motor shaft (while its out) will make the noises go away.

 

Motors & resistors are usually designed in conjunction, if it's a multi speed motors as it is in cars than the board os programmed to that specific resistor, it will not work if it doesn't see one of the progranmed resistance values, so changing out complwte motor with variable resistor that works with variable speed motors, although ot3possible but not fwasable to do on cara do to cost, design etc.. Since you would need a control module on thos case on cars it's ac control module that would talk with variable motors board or another name ecm, but since you're saying it's noisy & you don't get enough air flow I would roll all the way back & start with eisiest, hvac air handling filtet or cabin filter on cars if car is aged & you live on leafy dirty environments than almost guaranteed yoir evap coil is pretty dirty plugged inside hvac air handling box especially if changib cabin filters at least twice a year was neglected than there goes your answer. I've been master mb tech for over 15 years, now I'm a Union HVAC tech, o and anyone that own early years 2015 Ford Transits kerp in mind tgat Ford forgot to install Cabin filters in the factory so a load of tranaits have lots of failing evap coils due to oxidation & eventually rotting & leaking r134a into the cabin I'm syill surprised there was no class action law suit in that one the FU*****G OLD ROTTEN DEVIL as I would call it. Cheers.

 

Holy thread revival! That prior post is over a couple years old.

I don't think the early tundras are quite that complex requiring the ECU to see the correct current through the blower resistor to operate correctly as you're suggesting. I believe its just a simple multi-tapped resistor that limits the current through the winding of the coil of the blower motor.

 

I could see a bank of computer fan motors making a difference at 12v. Hardwired off the battery to a ?rheastat? Knob.
Especially if circ is on.

 

Yep, as simple as ohm's law !

 

But they have to be the expensive military grade ones that spin at 20,000 rpms so you feel like your sticking your head out the window at 75 mph.

 

A ducted fan from a hair dryer is pretty impressive.