Coolant warning light

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inkeys
E30 Zone Newbie
E30 Zone Newbie
Posts: 90
Joined: Tue Aug 21, 2018 11:00 pm

Thu Dec 20, 2018 11:46 am

Still having issues with my coolant sensor. Warning light comes on after 7or 8 seconds after startup. Level is fine and I just changed the sensor for a new oem one.

Any ideas?

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Current: 325i cab 1987 / Z3 2.8i 1999
Previous: Z3M Coupe / Z4M Roadster / E90 335i / Z4M Coupe / Z4 3.0i / E46 330i / Z3 2.8i
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paultv
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Joined: Mon Apr 21, 2014 11:00 pm
Location: Auf dem Schnee: Germany

Fri Dec 21, 2018 7:59 am

Have you checked the plug that connects to the sensor? It's really common for corrosion or frayed or broken wires causing intermittent connections to the sensor.

Put a loop of wire in the Plugs holes to short it out, turn on ignition and see if the panel light is still on, if it's not waggle the loom where it enters the plug and see if you get a warning indication light.

Make sure you clean the connectors on the plug as well, can be very messy and cause issues even with a new sensor.

Paul :-)
4th May 1990 325i Convertible.

BMW E30 Cabriolet Best Mod Ever:

https://bmwe30cabriolet-wdm.blogspot.com/
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inkeys
E30 Zone Newbie
E30 Zone Newbie
Posts: 90
Joined: Tue Aug 21, 2018 11:00 pm

Fri Dec 21, 2018 10:56 am

paultv wrote:
Fri Dec 21, 2018 7:59 am
Have you checked the plug that connects to the sensor? It's really common for corrosion or frayed or broken wires causing intermittent connections to the sensor.

Put a loop of wire in the Plugs holes to short it out, turn on ignition and see if the panel light is still on, if it's not waggle the loom where it enters the plug and see if you get a warning indication light.

Make sure you clean the connectors on the plug as well, can be very messy and cause issues even with a new sensor.

Paul :-)
Thanks. I'll give this a try!
Current: 325i cab 1987 / Z3 2.8i 1999
Previous: Z3M Coupe / Z4M Roadster / E90 335i / Z4M Coupe / Z4 3.0i / E46 330i / Z3 2.8i
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