07 equinox cooling system

[completelystumped]

my wife has an 07 equinox with 80k miles on it. Wife called me three months ago saying it was overheating. Noticed fan wasn't turning so I unplugged the connector cleaned it and plugged it back in. It started running no problem.

Took it to shop and they said thermostat and replaced it. Didnt overheat during testing or for three months.

Fast forward to yesterday and wife is sitting in a drivethrough line and temp gauge spikes and car doesnt want to run due to heat.

Get there and fan isnt running. Unplug and plug it back in fan starts running. Engine instantly runs cool and no problem.

Any idea what this may be?

 

[mswerb]

Could be a bad fan, check the fuses.

 

[completelystumped]

Would it be smart to just replace all the fan relays just to be safe? Unsure how to check the fuses except the for pulling them out and making sure they aren't blown

 

[mswerb]

^ That IS how you check the fuse.

 

[prheaume]

what about a coolant temp sensor ? on my ex-mazda protegé I had a similar problem, two wires on the sensor, one was cuted but still sending signal when the two parts of the wire touched.