I have verified that my fan clutch is good by grounding out the lead that goes to the switch at the thermostat. Will I have to drain my coolant to change these switches? I am going to replace the one for the aux electric fan as well.

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1984 190D 2.2 Auto 220k
2001 Jeep Cherokee Sport 70K
2004 Lexus RX-330 ??K
2005 Chrylser Crossfire LTD 6K

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