InfinitiGirl,
The dealer will only
replace the heater control. They will NEVER EVER do soldering.
Some Techs don't even know what soldering is!!
The
"Whole" dash does
NOT need to come apart!!!!!!!!!!!!!!!!!!!! Just the silver panel around the A/C control.
The Dealer usually kills yu on labor here.
How would a dealer make profits if they just soldered everyones Heater Control issue ???????
Anyway...
Follow posted instructions. Or let an experienced electronics guy do it for much cheaper.
A radio repair place could even do it if yu directed him with instructions from here. One option. Why pay the dealer to fix a neglected Toyota defect.
The Dealers will always BS especially a Lady when it comes to cars..
I don't have to tell yu this.
If yu feel compelled to do it yourself I suggest yu read up on
soldering. It is not hard at all.

Please believe this.
But don't do your very first soldering job on
THIS project.
Practice on some wires and stuff first. The Net has much info on
Basic soldering. That's all yu need to know.
99% of people doing this got perfect results.
The 1% who did not, basically never did soldering before. But most anyone can do it for sure.
Soldering is fun too.

A skill yu develope and use on other projects.
LifeTech