Hmm.. seems odd that the A/C would now work but not the kickdown.
Did both go dead at the same time?
Perhaps in trying to fix things, you somehow disconnected the kickdown switch? Now that you have a good Klima relay, run all the same troubleshooting tests again on the switch.
Maybe someone here can jump in and clarify, but I thought the kickdown was a simple two-prong switch. Without it working, your car will never shift down a gear. If you jumper across it and drive the car, shouldn't it stay in 1-2-3 gear only (never go into 4th?) It should act like you have it in "3" rather than "D".
Give that a shot.. see if jumpering the switch tells the car that the it is in kickdown all the time.. if so, you have a bad switch.
If not, I have no idea
Neal
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