Quoth Dave in MD
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-or-
You do just that and still don't listen.
Check eng light on, comes in. I read it - Coolant temp sense low.
(these are simple thermo reactive resistor devise that rarely fail you can even check them in the kitchen buy heating them in a pot of water and reading the resistance BTW the pins.)
Anywho it was Canada cold that day and week. Other major issue and why Diag cost $$- you got to figure out is that code the fault or a symptom of the problem.
(20 years of fixing radar jammers and detectors on Navy A/C diag is a big skill)
So a stuck open thermostat can make the eng run cold and make the temp senase "low" well cause it is. 160F-vs-205F. Now the gauges on your dash are "approx" but if you pay attn you can see that it's not getting to the 12 O'clock position but only the 9. I ask about it, he swears thats norm. Go back and forth repeating stat fail in this weather is common and sense is never. NOPE gets the sense.
Comes back next day swearing up a storm, our parts are shit and lots of other CS standard shit. Poor kid on the counter is struggling and I see who it is so I come up to fix this guys attitude. I grab the IR thermo we had for checking battery temps, take him back to his truck, and show him the temp on the code reader says the sensor is reading 170 and this is showing the brass base of it and coolant tap is 168. Truck has a 205 thermostat, truck cold cause it's broke LIKE I SAID yesterday. But you wanted it so no refund, it's working,installed. He does not like our call outs go to the people who are paid to do it.
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