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Originally Posted by mdeverich
Installed new sensors and thermostat(Thermostat is a 190Deg). Going by the temp gauge the thermostat doesn't open until it hits about 250deg, then drops and holds steady at 215deg. I took a thermometer and did a check in the radiator and it was reading 170deg. This tells me that the gauge in the truck is off by 45deg.
Not sure whats going on, was thinking I could hook up a mechanical gauge to the block sensor and get a accurate reading. Never heard of the gauges being off like that. (electronic type)
any ideas?
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the 2 wire intake mounted sensor is the ECT/CTS - it feeds the ECM. hook up to a scan tool and then you can see what it is thinking if you select data stream output. the 1 wire in the side of a head or block is the gauge - they tend to corrode and they jump all over on those junk chevy gauges.
First use a scan tool to determine actual temp, if you feel it is off, grade it with a temp sensor - one of the IR type
if this is ok, then go after fixing the other one.