kevscab Posted June 6, 2018 Share Posted June 6, 2018 Hi all. Had my clocks out the other day and now the temp gauge is off the scale and won't work. How do these work? Is there a seoerate plug behind the clocks for the temp gauge or are they connected in the main loom? It could be from under the bonnet too as I've been messing around there too lol Car is 90 xr3i efi engine. Thanks in advance all Quote Link to comment Share on other sites More sharing options...
Paul Grainger Posted June 9, 2018 Share Posted June 9, 2018 The wire is in the multiplug which goes to the instrument cluster. The gauge gets power then earths out by a 'negative coefficient thermister' in the thermostat housing; also known as a sender unit. This means that as the temperature increases it lets more power through and the gauge goes up. If the gauge is right down low then it could be the small wire off the sender on the thermostat housing. A good test is to switch the ignition on and earth out the wire that normally goes to the sender to the engine. The gauge should go to the top of the red. If it does then the sender unit is at fault. If it doesn't it could be the gauge or its wiring. If replacing the sender then get one with the same colour insulator ring or the gauge normal position will be in a different place. Cheers Quote Link to comment Share on other sites More sharing options...
kevscab Posted June 10, 2018 Author Share Posted June 10, 2018 Top man I'll be getting under the bonnet next weekend thanks for your info Quote Link to comment Share on other sites More sharing options...
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