Installing duel electric fans & factory fuse block in 04’ Tahoe for better low speed operation . Can the ECU be remapped out of the car ? And who is the most dependable?

I feel like I need about 10% more information to understand the question.

You're installing electric fans that replace the mechanical fan?

You want the ECU to be remapped while not installed in the car, like on a bench by some kind of service that does this kind of thing? . . . and the remapping is related to the fans?

Who is the most dependable at remapping an ECU for electric fans while out of the car?

​​​​​​​Maybe I need more than 10%.

Yes , you are correct. Need the ECU remapped to operate the electric fan operation. I would like to send the ECU to a vendor who offers this service . Seams simple operation ,but have had no luck in finding a shop to remap my ECU . I live in Knoxville area & driving for this service would be my first choice 👍

If you have the spare $500, get HPTuners and do it yourself. There are more custom parameters for fans than you think.

I wouldn't trust a single programmer out there.

Yep that’* the way I’m feeling too

https://www.flashmastersecm.com/

Cardixer007 , thanks for the info about flashmasterecm . After a very helpful phone call I was refused to “ Garrett tuning” . I can send in my ECU for the simple Remapping of on / off & AC operation . So I found out Flashmasters is a reconditioning on a mass scale , They referred me to Garrett who is tuner . Garrett was very familiar with this very common upgrade on the 2000-2006 Tahoe, Yukon etc . I will report down the road on my modified,

I recommend that you tell them the on/off temperatures that you desire. This image shows you the temps that I've settled on. The GM 'default' temp settings are much higher than this, which I think is too high. Since your original post indicated that you desire better cooling at low speeds, I would think you would not be happy with the higher GM default settings. They may ask but in case they don't...

What I did not mention in my original post . The cooling problem I’m trying to correct is the poor AC cooling at low Vehicle speed . Classic GM problem before electric fans . My 04’ tahoe is Black, has rear AC & new radiator a year ago . On a hot day in the south you need all the help you can get !

Swap the fan clutch for a severe-duty fan clutch. That will take care of most or all of it for a lot less time, work, and money. I did on my 2001 YukonXL. Worked wonders. I also insulated all of the exposed cold refrigerant lines under the hood. I'm not sure how much that helped, but it must have helped at least a little.

Also:

Do you know that the system is in good condition and properly charged?

Have you tried running front and rear AC at the same time to cool the vehicle?

What is the amperage rating of the alternator?

Do all of your door seals actually seal fairly well?