During cold weather (eg.minus 5 degrees celsius or lower) speedometer needle keeps on going up to maximum. After long trips (eg.100km) it resets or goes down to zero. The following day it will go back to the max reading and slowly decrease from (200km and lower). Basically not reading accurately. What is causing this problem and how can it be fixed? Thanks.
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The water expands up to more than 9% when it freeze below 0 degrees Celsius. Due to this phenomena, during the extreme cold weather when the ambient temperature falls below 0 degrees the cylinder blocks of the automotive engines often burst or crack badly.
This damage can be prevented by using the antifreeze coolant in the cooling system.
The 2003 gm vehicles have a common problem within the instrument cluster panel. Each gage has a "stepper motor" soldered to the back side of the circuit board; and a very small shaft protroding through the circuit board with a needle for the gage attached . The stepper motors are about the size of a quarter in diameter with four terminals. They are small gearmotors. They do not have a spring return; so when they fail their needles do not return to home (0 psi for example or 0 miles/hour). You can find reputable repair shops online. One I know of in Minnesota is www.speedometerrepairguy.com. I bought the parts from him (on ebay) and soldered them myself but beware you need advanced soldering skills here not to mention a very good magnifying glass to inspect the solder joints. I hope this helps.
In my case the speedometer was hanging up in cold weather.
Replacing the stepper motors cured my troubles.