On any 126 they are in the center of the dash buried deep in the A/C - Heater system. Almost directly behind the A/C Control panel but way deep in there. They are a BITCH to replace as you have to take out the dash and Bendix A/C core unit. I've seen it done and it's no easy process. Even if you know how, it is still labor intensive.
The core is only a a hundred or so I think. Just a bitch to get to.
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