My temp gauge read really low for a while and then it read high, just below the red. Sometimes it would just drop suddenly. So I bypassed the temp compensating board. No change. I bought a new sensor, no change. I grounded the lead and it went high but not all of the way. IF I unplug it it goes down to cool but not to the bottom. I then grounded it to the negative battery terminal with a test light and the light came on very faint. I guess it is getting a signal from some electrical problem.
BTW I installed a TEMP gauge in the hose AFTER the thermostat so I can see that it is opening. car runs on that on at about 175.F. Where could it be picking up a signal when it's unplugged?
I give up! Help!
1990 Volvo 240- Bizarre Temp Gauge Isssues
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RickHaleParker
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1998 C70, B5234T3, 16T, AW50-42, Bosch Motronic 4.4, Special Edition package.
2017 Ford PIU. 3.5l, Twin Turbo, 365 Hp.
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Past
2003 S40, B4204T3, 14T twin scroll AW55-50/51SN, Siemens EMS 2000. ( Killed by a plastic radiator. )
2004 S60R, B8444S TF80 AWD. Yamaha V8 conversion ( I moved, the project did not )
2005 XC90 T6 Executive, B6294T, 4T65 AWD, Bosch Motronic 7.0. ( Transmission dead after sitting for a winter )
1998 C70, B5234T3, 16T, AW50-42, Bosch Motronic 4.4, Special Edition package.
2017 Ford PIU. 3.5l, Twin Turbo, 365 Hp.
............................
Past
2003 S40, B4204T3, 14T twin scroll AW55-50/51SN, Siemens EMS 2000. ( Killed by a plastic radiator. )
2004 S60R, B8444S TF80 AWD. Yamaha V8 conversion ( I moved, the project did not )
2005 XC90 T6 Executive, B6294T, 4T65 AWD, Bosch Motronic 7.0. ( Transmission dead after sitting for a winter )
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93Regina
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>My temp gauge read really low for a while and then it read high
Yeah, I bought a 1989 Volvo, which had the high read issue...previous owner who bought it a month earlier 'freak' on it, and sold it to me. He had replaced water pump and thermostat...he never told me about it.
I had a electronic tech inspect instrument panel, and he replaced some electrical parts, which mostly made this issue disappear. I installed a cooler thermostat, which was used in earlier years, but I do longer daily runs. It's not red-lining now.
I'm not concerned about it, but if a new wire was installed, from temp sensor to panel's plug, I suspect this issue might disappear.
Yeah, I bought a 1989 Volvo, which had the high read issue...previous owner who bought it a month earlier 'freak' on it, and sold it to me. He had replaced water pump and thermostat...he never told me about it.
I had a electronic tech inspect instrument panel, and he replaced some electrical parts, which mostly made this issue disappear. I installed a cooler thermostat, which was used in earlier years, but I do longer daily runs. It's not red-lining now.
I'm not concerned about it, but if a new wire was installed, from temp sensor to panel's plug, I suspect this issue might disappear.
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