isouthernyankee

1998 Buick Regal, Any ideas why the A/C fan only runs on the high setting?

BNaylor

Sounds like you have a defective blower motor resistor. Its located in the blower motor and housing assembly under the passenger side of the dash board.

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'08 Pontiac Grand Prix GXP (Dark Slate Metallic) - LS4 5.3L V8
'08 Pontiac Grand Prix GXP (Liquid Silver Metallic) - LS4 5.3L V8
'02 Oldsmobile Alero GL2 - LA1 3400 V6
'99 Buick Regal LS - L36 Series II 3800 V6
'03 Honda CR250R MX - 2 Stroke 250cc
'97 Pontiac Grand Prix GTP - L67 Series II 3800 V6 Supercharged
Timeslip 08/12/06

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nuclearjack

I had the problem where the fan would only run for 10 second then off for 30 and on for 10 and so on and so on. found out it was a poor battery problem.