You should run the fan only on full speed, with your thought behind.
Next thing, on speed 1 or 2, the resistor will fail :-(

Anyway, if you have the heater box apart anyway (too late for you now,
it seems), it shouldn´t be a problem to check noises from motor or fan
blades while not yet re-installed in the Van.
Put heater box top and lower half together, temporarily, and test the
fan without any resistor. I did that last summer. Found out it was not
balanced well and got a new one from supplier.

Regards
Raimund

Am 12.03.2022 um 16:16 schrieb Tom C:
> As always thank you Dennis… I think I got lucky for a change. Fan seems to
> be running fine. I’ll just not crank the fan on high from here on out. I
> installed the ram air control so On super hot days I was closing down the
> outside are and just recirculating cabin air.
>
> On Sat, Mar 12, 2022 at 9:43 AM Dennis Haynes<d23haynes57@hotmail.com>
> wrote:
>
>> I don’t know if this was answered and sorry for the delayed response.
>> Normally the blower motors-fans get installed as received. However quality
>> is poor and sometimes they are noisy, fan balance or motor hum, and the
>> motors can be downright defective. On install I always test for operation
>> and current draw not using the van circuit for power. I probably return 1
>> out of 4 or 5 motors.
>>
>> One you have one working as it should some thought needs to be given to
>> prolong its life. There is almost no benefit to run at high speed for any
>> length of time and except for initial warm up-defrosting the windshield or
>> stuck in traffic there is little reason to even use it. Air will come in
>> when the van is moving and there are bypass flaps to allow air to pas
>> around the blower wheel. Also, see that #2 near the pictogram for the
>> levers? Fan spped 2 offers the best heat transfer ot temp rise for clearing
>> the windshield.
>>
>> Dennis
>>
>>
>> -----Original Message-----
>> From: Vanagon Mailing List<vanagon@gerry.vanagon.com>  On Behalf Of Tom C
>> Sent: Thursday, March 10, 2022 1:59 PM
>> To:vanagon@GERRY.VANAGON.COM
>> Subject: Blower motor balance
>>
>> Hello everybody,
>>
>> Do new front blow motors have to be balanced or do they come balanced? I
>> put a new one in and it melted my fuse when I was running it on high a
>> couple of summers ago, so I only run it on medium now and it’s been fine. I
>> know that circuit is a bit weak, I’ve heard people running their wipers on
>> high and the fan melting the fuse. I gotta pull the dash again to mess
>> around in there so was just curious if I needed to balance the fan while I
>> have the dash out. Will that help prevent the fuse from melting
>> periodically on high?. I also heard of using a relay on the circuit. Wonder
>> what your guys opinion on that is? Last I was thinking of replacing the
>> resistor with a keep resistor. Read up on it on thesamba. What do you guys
>> think of that mod? Thanks guys tom
>>