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
-
RickHaleParker
- Posts: 7129
- Joined: 25 May 2015
- Year and Model: See Signature below.
- Location: Kansas
- Has thanked: 8 times
- Been thanked: 958 times
⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙
1998 C70, B5234T3, 16T, AW50-42, Bosch Motronic 4.4, Special Edition package.
2003 S40, B4204T3, 14T twin scroll AW55-50/51SN, Siemens EMS 2000.
2004 S60R, B8444S TF80 AWD. Yamaha V8 conversion
2005 XC90 T6 Executive, B6294T, 4T65 AWD, Bosch Motronic 7.0.
1998 C70, B5234T3, 16T, AW50-42, Bosch Motronic 4.4, Special Edition package.
2003 S40, B4204T3, 14T twin scroll AW55-50/51SN, Siemens EMS 2000.
2004 S60R, B8444S TF80 AWD. Yamaha V8 conversion
2005 XC90 T6 Executive, B6294T, 4T65 AWD, Bosch Motronic 7.0.
-
93Regina
- Posts: 2813
- Joined: 18 January 2014
- Year and Model: 93:240/940
- Location: Sunflower State
- Been thanked: 65 times
>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.
-
- Similar Topics
- Replies
- Views
- Last post