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janselmosr 8/18/2013
1998 Cadillac Seville STS 8Cyl4.6L - Body & Interior
When A/C is turned on it does not come on until car goes over a bump in the road, then it works fine
Same problem with the heater in the colder weather
2 Answers
  • Jimm
    Jimm 8/18/2013
    Check the fuses and wiring / connections, as well as the relays for a loose connection.
  • wbrockstar
    wbrockstar 8/19/2013
    After checking items previously mentioned,dont forget to check the resistor for the blower motor and the motor itself.Its the part under your dash(passenger side) that has a couple screws attaching it to the black housing which holds the ac/heater components

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