My '06 Alto's temperature gauge is bouncing up and down randomly. It does not go above the mid-gauge mark and the radiator fan appears to be working fine. There is no specific pattern associated with this behavior but sometimes I have observed that it will go to the mid mark when i m cruising around 50km/h with the engine reving high and tends to go down to the lowest mark when i decrease the speed and down shift the gears. Do note that this pattern is not observed every time the above described scenario takes place. As in, there was this time interval when the temp. gauge stayed down permanently for a while.
Could it be the faulty thermostat? or shorted temp. gauge wiring?
I was getting my car tuned a while back, and when the mechanic was adjusting the petrol supply to the engine i observed that the temp. gauge was bouncing up and down. What can be the reason behind it?
Suggestions on diagnosing the problem correctly and any remedies will be deeply appreciated.
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