3. May an ACC cold solder issue. You'd have to remove and inspect it.

4. Please put your car in your avatar or signature, this is important to answering questions.
Pics? If you have a 123, the reservoir should be beside the radiator.

5. The dial should be the radio front/rear fader, not sure of the "adjustable knobby", pics?

What car?

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83 SD

84 CD