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coolant temp sensor question....puzzlement.

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Old 04-21-2007, 10:28 AM
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Default coolant temp sensor question....puzzlement.

So the coolant temp guage has read cold (no needle rise whatsoever) for the latter half of winter. I chalked it off to below and near freezing temps we've been having for past 2-3 months. However, today it should've registered something, but got no rise whatsoever. Should note I've had no CEL, no codes thrown. I checked coolant sensor, it's the green variety. As an aside, when starting the car the temp guage climbs about third way up, then drops back down to cold.

Sooo, what else should I be looking for? Is the green variety still prone to failure, simply not as much? Hate to think it's the cluster...

As always, TIA!!
Old 04-21-2007, 12:01 PM
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Default greens better but do fail also... Vag com value blocks of cluster

The sender has 4 wires, its possible the part for ECM is good but not to the cluster, you should also be able to run output check on cluster where it will do a full sweep then go to half to make sure the cluster is okay, If none of that poss. Thermostat?
BTW those sensors are only about $20. might be easy enough to just put new one in
Old 04-22-2007, 06:06 AM
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Default will try popping a new one in, troubleshooting from there. thanx for heads up on vagging the

cluster. unable to locate part on wkend...hardest part is waiting.

and if it works out to be thermostat, no prob there as TB is about due up. would just have to wave goodbye to cash earlier than was planning. =)
Old 04-22-2007, 04:16 PM
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Default

If you still get heat out the vents....then it's w/o a doubt the sensor.
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