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400 Series General Forum for the Volvo 440, 460 and 480 cars |
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Coolant temp gauge shoots to max.Views : 1870 Replies : 8Users Viewing This Thread : |
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Sep 1st, 2018, 20:09 | #1 |
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Location: Stevenage
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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. |
Sep 3rd, 2018, 13:50 | #2 |
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Last Online: Mar 27th, 2024 07:49
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Location: Bristol
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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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Sep 4th, 2018, 04:39 | #4 |
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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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Oct 6th, 2018, 18:51 | #5 |
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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? |
Oct 6th, 2018, 18:56 | #6 |
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Last Online: Oct 8th, 2018 19:37
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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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