99 V70 GLT E-Fan Not Switching On


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I just picked up a '99 V70 GLT, low miles, but many problems, and the first to address is the e-fan that is not working, no grounding to activate the relay.

Does anyone know where the ground originates? I get a constant 170k ohms, whether the temp is at or above operating temps, not getting a complete ground, which I would assume comes through the ECM when it see the temp rise/ rate-of-rise to turn it on. ECM failure?

New temp sensor and 87 deg t-stat, car runs fine otherwise, temps via OBDII show constant 87 deg F normal operating temps, using a manual switch on the fan.

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  • 3 weeks later...

The fan is activated by a switched ground within the ECU. The ECU received signal from the ECT sensor on the thermostat housing to determine when to activate the fan. Are you sure the fan motor is grounded, and that you're getting power at the relay?

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