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Coolant temp gauge shoots to max.

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Old Sep 1st, 2018, 20:09   #1
Robin77
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Default Coolant temp gauge shoots to max.

Hiya All.
I have been a happy 440 owner for 2 weeks and the daily commute has become the highlight of the day.
A problem has arisen with the coolant temperature system.
When I turn the ignition on (without starting the engine) the coolant temperature needle shoots straight to maximum.
I am replacing the temperature sensor but if it was faulty I suspect the temperature would indicate low.
Any thoughts.
Regards, Robin.
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Old Sep 3rd, 2018, 13:50   #2
tofufi
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I can't comment on 440s in particular, but it's my understanding most cars would have the temperature gauge behaving like that when there's an open circuit to the earth. Either a duff switch, or chafed wiring allowing the circuit to be completed.

If you remove the wire on the temp sender, and it does the same, its probably chafed wiring. If you remove the wire and the temp gauge then reads 0, it's probably the sender unit.
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Old Sep 3rd, 2018, 20:48   #3
Robin77
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Default Many thanks indeed.

Many thanks indeed to Tofufi.

I replaced the sender today and no change so wiring it is....sigh.
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Old Sep 4th, 2018, 04:39   #4
tofufi
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Is it possible to disconnect the wire at the speedometer end (without disconnecting the others) to test that the gauge itself isn't faulty? I'd imagine not, but it could be possible.

As I said above, I've no 440 experience at all so only going on general principles. Good luck!
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Old Oct 6th, 2018, 18:51   #5
Robin77
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Default Coolant temp sender to dashboard needed. Volvo 440

Many thanks for the previous reply. It seems there are two coolant sensors on the 440. The one I changed is for the fan only.
I went to a Volvo specialist who isolated the fault to the temperature (to dashboard) sender but that, it seems, was the easy part. Getting hold of a Volvo one is the hard bit.
The local Volvo Specialist advised against using an aftermarket item as they think it could burn out the dashboard dials.
Has anyone any ideas?
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Old Oct 6th, 2018, 18:56   #6
Robin77
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Default Weight loss problem.

As the car has no temperature gauge I am running the heater at Maximum to (hopefully) detect problems through reduction of heater air temperature.
It takes an hour to get to work each day and I am losing about a stone a week in my sauna-car. If I cannot find a sensor in the next 12 weeks I will...vanish.
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