Fans never come on!

**kensz28** · 08-28-2008, 06:57 PM

My fans do work when hooked to the battery and i have checked the relays as far as I can tell they work too. It seems when I drive it it stays cool enough but when I drive slow or let it idle coolant boils out of the overflow. Why aren't the fans working when this happens? The car is a 98 M6 Z28.

***Ed Blown Vert*** · 08-28-2008, 07:03 PM

Air in the system?

**Y2KPewterSS** · 08-29-2008, 07:36 AM

Thermostat going bad?

**CamaroFan71** · 08-29-2008, 12:50 PM

The temp sending unit isnt kicking the fans on?

**2001NBMZ28** · 08-29-2008, 01:16 PM

If the SES is on see if you have any ECT or fan circuit codes.

**kensz28** · 08-29-2008, 03:21 PM

Originally Posted by CamaroFan71

The temp sending unit isnt kicking the fans on?

Is that on the block/heads somewhere? I know the low coolant light is on. And the car is full. I doubt it has dex-cool in it either. It does throw ses but when I checked it I remember getting egr inop.

**Y2KPewterSS** · 08-29-2008, 03:31 PM

Originally Posted by kensz28

Is that on the block/heads somewhere? I know the low coolant light is on. And the car is full. I doubt it has dex-cool in it either. It does throw ses but when I checked it I remember getting egr inop.

Its on the driver head, around the 1st plug.

**kensz28** · 08-31-2008, 12:02 PM

Originally Posted by Y2KPewterSS

Its on the driver head, around the 1st plug.

You're talking about the coolant temp sending unit? I know what that is, am I missing something else? My gauges seem to be accurate. What exactly triggers the fans? The ecm?