alfredthunder1
Spark erratic temperature display
Summary of the thread
A 2011 Chevrolet Spark was experiencing erratic temperature display readings, a persistent check engine light, and slow engine warm-up. The suspected causes included a cooling grille restriction and a defective fuse. A suggestion was made to check for a faulty thermostat, which could cause the cooling fan to run excessively and lead to incorrect temperature readings. Upon professional inspection, both a defective fuse and a faulty thermostat were identified and replaced, resolving the issue.
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4 comment(s)
alfredthunder1 (community.author)
Good shout! The fan is running more than usual, I've noticed that. But wouldn't a faulty thermostat throw a different code? And could that cause the temperature display to act so erratically? It jumps around like it's possessed!
walter_silber22
Yeah, it's a bit odd, I agree. My check engine light came on too, but the error code pointed towards the cooling system. Turns out, there was a small blockage and the thermostat was faulty. Honestly, at this point, I'd recommend getting it checked out by a professional to be sure. Save yourself the headache.
alfredthunder1 (community.author)
Took your advice and brought it in. You were spot on, kind of. Turns out a fuse was indeed defective and the thermostat was indeed faulty! New fuse and thermostat, and she's running like a champ again. Cost me 52€, but worth it for the peace of mind. Thanks for the help!
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CHEVROLET
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SPARK
walter_silber22
I had something similar happen with my Spark. Is the cooling fan running constantly, even when the engine is cold? It could be a faulty thermostat stuck in the open position, preventing the engine from reaching optimal temperature. That would also explain the weird temperature readings.