Post Number: 160
|Posted on Friday, 10 November, 2023 - 15:35: |
The external temperature gauge on my 1978 Corniche DRH32489 has been playing up. It works occasionally, but mostly it indicates about -30 deg C (the lowest it can read).
In a moment of madness, I have taken off the radiator shell and looked at what I have got installed as the sensor.
The sensor and the associated gizmo enscribed 7K1.
The Sensor is a VDO device with the number 977.
I have looked at the Introcar and Flying Spares sites and there appears to be nothing resembling the system I have found. Does anyone have any idea of what I should do? Does anyone know what the gizmo labelled 7K1 actually is?
By the way: Now that I have pulled the radiator shell assembly off, the external temperature is reading perfectly!! Looks like I will have to reassemble everything before I get the dodgy temperatures again.
Post Number: 390
|Posted on Friday, 10 November, 2023 - 19:42: |
John, the temperature reads very low because there is a break in the two-wire circuit from meter to sensor and back. Twiddling the wiring while watching the result at the meter should find it - most probably at a connector. The environment around there is hostile to electrical connections.
HTH, Alan D.
Post Number: 161
|Posted on Wednesday, 15 November, 2023 - 10:36: |
I fiddled around with the connections and taped over the damaged covers, and the temperature reading remained exact. I also noticed that the gizmo labelled 7K1 had a hole in it corresponding to the hole in the bracket which holds the sensor. So I bolted it on and the wiring looked like it was originally in place there. I put the radiator shell back on and went for a spin for an hour or so - the temperature was perfect!
Many thanks for the suggestion. It would be interesting to find out what the 7K1 gizmo is. Perhaps it is part of a wheatstone bridge type of measuring system.