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post #1 of 5 (permalink) Old 23-03-2017, 17:14 Thread Starter
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Smile Mg zs (2005/2005)

Hi all just a question about dodgy temp gauge. My temp gauge goes into the red when idling for a while but is not actually overheating, i have changed coolant temp switch with an original one from Rimmer Bros.
some people say there are two switches but i can only find the one in the V (2.5 V6) and other people are saying ecu temp, does anyone know for certain what would cause this problem and if so how to fix, thanks for your time.

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post #2 of 5 (permalink) Old 23-03-2017, 21:08
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Welcome aboard. Sorry to hear of your problem but no doubt it can be sorted. If the KV6 is like the 4-cyl versions then there are two coolant temp sensors - one of the ECU and one for the gauge.
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post #3 of 5 (permalink) Old 23-03-2017, 21:19 Thread Starter
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Thankyou when i get the chance i'll have another look.
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post #4 of 5 (permalink) Old 31-03-2017, 19:44
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Do the fans cut in? Btw how do you know it's not over temperature?

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post #5 of 5 (permalink) Old 31-03-2017, 20:59
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Hi and welcome to the forum.

All K series (including the KV6) use 2 coolant temperature sensors (CTS). One is used for the dash gauge and has one wire, IIRC it is blue. A quick test is to earth the wire which should send the gauge into the red, just unplugging it and the gauge should read cold, if it reads anything else when unplugged there is a fault, possibly the gauge but more likely the wiring.

The other sensor is either black or brown depending upon which version of MEMS your car has (MEMS 1.6/1.9/2.0 is brown and MEMS 3 is black IIRC). It has 2 wires and supplies the ECU with a far more accurate reading and is used for fuelling etc. MEMS 3 operation can be confirmed with any OBD2 reader, earlier cars require a specialist reader.

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