Recently, my temp readings on the factory gauge have been as high as 3/4 up the scale. I have now installed an electric fan and a digital fan controller so I can see the actual radiator coolant temps. I can now see that radiator temps are fine.
The factory temp guage sender is located in the rear iron. I'm wondering what is causing this sudden temp increase from the factory guage? I'm thinking sender, water pump or simply a cooling sytem cleaner?
Factory guage will come down eventually once the car is on the move but still reads significantly warmer than before.
Do I have an issue here or am I worrying too much?
Coolant temp readings
-
- VIP User
- Posts: 2268
- Joined: Sat Nov 05, 2011 8:07 pm
- Location: Feltham, Southwest London
- Has thanked: 482 times
- Been thanked: 192 times
Re: Coolant temp readings
Thanks Ian
Ive ordered one from RockAuto. Hopefully its the correct thread pitch, there are two different versions apparently.
Ive ordered one from RockAuto. Hopefully its the correct thread pitch, there are two different versions apparently.

1985 Sunrise Red S3 TWR
2006 Mercedes CLK 280 Sport AMG
2006 Mercedes CLK 280 Sport AMG
- DKWW2000
- VIP User
- Posts: 1625
- Joined: Sun Jul 06, 2014 10:16 pm
- Location: English Riviera - South Devon
- Has thanked: 183 times
- Been thanked: 187 times
Re: Coolant temp readings
Dave, I have a working spare buried somewhere in the building site/garage if needed
RX7 FB S3 - RX7 FC TII Vert
Rotaries Previously Owned:-
2 x NSU Ro 80s - 2 x S2 RX7s - Suzuki RE 5 - DKW(Hercules) W2000 - Norton (Krauser) Commander
Rotaries Previously Owned:-
2 x NSU Ro 80s - 2 x S2 RX7s - Suzuki RE 5 - DKW(Hercules) W2000 - Norton (Krauser) Commander
-
- VIP User
- Posts: 2268
- Joined: Sat Nov 05, 2011 8:07 pm
- Location: Feltham, Southwest London
- Has thanked: 482 times
- Been thanked: 192 times
Re: Coolant temp readings
"Like trying to find a thermostat in a building site" as the old saying goes
Thanks Pete, if the RockAuto stat dosn't fit, I shall be in touch.

Thanks Pete, if the RockAuto stat dosn't fit, I shall be in touch.

1985 Sunrise Red S3 TWR
2006 Mercedes CLK 280 Sport AMG
2006 Mercedes CLK 280 Sport AMG
- spirit r
- VIP User
- Posts: 1895
- Joined: Sat Feb 09, 2013 4:15 pm
- Location: Germany Black Forest
- Has thanked: 473 times
- Been thanked: 253 times
- Contact:
Re: Coolant temp readings
Polish the old ones wire contact and check the masse contact between engine and bodyshell, sometimes will help Dave.