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1990 Volvo 240- Bizarre Temp Gauge Isssues

Help, Advice, Owners' Discussion and DIY Tutorials on all Volvo's "mid era" rear wheel drive Volvos.

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1990 Volvo 240- Bizarre Temp Gauge Isssues

Post by rice240 » Thu Mar 26, 2020 12:37 pm

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!

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Re: 1990 Volvo 240- Bizarre Temp Gauge Isssues

Post by RickHaleParker » Thu Mar 26, 2020 10:20 pm

Platform: P80 1998 C70, B5234T3, 16T, AW50-42, Bosch Motronic 4.4, Special Edition package, Plant: Uddevalla Sweden.
Platform: X40 (Nedcar) 2003 S40, B4204T3, 14T twin scroll AW55-50/51SN, Siemens EMS 2000. Plant: Born Netherlands.
Platform P2 2005 XC90 T6 Executive, B6294T, 4T65 AWD, Bosch Motronic 7.0, Plant Torslanda Sweden.
Platform P2 2004 S60R, B2524T4, AW50/51 AWD, Bosch Motronic 7.0, BorgWarner K24 turbocharger, Plant Ghent Belgium.

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