Re: 92 740 turbo wagon B230FT.... dash temp gauge.....
I pulled off the eng. coolant temp sensor conn. and jumped it....the gauge then went full-scale, so that shows that there is no abnormal external resistance. It may not be the normal failure mode for a thermistor...but apparently that is what is bad.
Who has it for $20.00? Rockauto.com was recommended to me as a cheap place to get Volvo parts, but I seem to recall pricing new sensor at $40.00
Also, I found out from the brother that he removed the thermostat. The car has been running only about 185 F or so, as the weather is not hot yet. So I am wondering if the engine could be running open-loop all the time, and so using a lot more gas than normal? But I don't have the exact number on when (what temp) the ECU switches to closed-loop. I think the normal range of temps is 195-210, right?
Is there some slight change in idle speed or something to show that the ECU has switched to closed-loop?
thanks, geronimo