I have a 94 GMC Jimmy 4.3L, this is the problem: If I start the engine when it is cold, the digital dash shows the water temp as overheating. Would this be a colant temp sensor issue?
I will check the temperature sensor like you suggested. If it is bad I will replace the CTS and this sensor. If it is good, I will change the CTS only.
Do you know if the CTS is bad ? A good scanner would tell you quite easily.I wouldn't just replace it unless you've verified it's operating out of spec.
Chris - I unplugged the sensor between #4 & #6 cyl. and it still did the same thing. Only difference is that the check engine light came on the second I unplugged the sensor.
Maybe it is backwards on your truck,and you unplugged the CTS.I'm at home,so I can pull up any info here,but as soon as i get back in the shop,i'll let you know.
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