Coolant temperature sensor failure

Tiny
EVANG ADE
  • MEMBER
  • 2007 VAUXHALL VECTRA
  • 1.8L
  • 2WD
  • MANUAL
  • 118,000 MILES
I notice that the fan does not work when the engine is hot which cause my engine to overheat, so I replaced the sensor and after three weeks same issue occur again. I am confused because I just replaced it. I am thinking probably the housing sensor is ruining the sensor. What do you think?
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Saturday, July 15th, 2017 AT 12:49 PM

3 Replies

Tiny
JIS001
  • EXPERT
Unfortunate we do not have your vehicle here in the United States of America to look up information or wiring diagrams. The first thing you should do is manually power up the fans to see if they come on. If they do you would need to look at the vehicle data with a compatible scanner.

What you need to look at is the ECT sensor temperature to see what the temp is when overheating. Second you need a wiring diagram to see if there is another temp sensor that will send a signal to have the fans come on.

Also, you need to verify the thermostat is functioning properly. If it Is closed all the time the top part of the engine is cold and the temperature sensor never sees it getting hot while the lower part gets hot and the head temp sensor sees it is getting hot to show you on the gauge.

Restrictions in the cooling system or faulty water pump can also cause the fans not to come on because it acts like a bad thermostat been shut closed and once again the top part where the ECT sensor never sees that temp change because coolant is not flowing.

Here is a link on the basics of he cooling system:
https://www.2carpros.com/articles/engine-cooling-system
Hope the info helps you out.
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Saturday, July 15th, 2017 AT 7:47 PM
Tiny
EVANG ADE
  • MEMBER
Thanks.
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Saturday, July 15th, 2017 AT 11:55 PM
Tiny
KEN
  • ADMIN
Please let us know what happens, we are interested to see what it is.

Cheers, Ken
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Monday, July 17th, 2017 AT 1:08 PM

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