Mk1 F temp sensor for gauge.

Mk1 F temp sensor for gauge. was created by Fireline

Posted 8 months 1 day ago #204798
Hi all. Sorry, but I'm beating my head against a brick wall here. My temp gauge isn't working on the dash, and it appears that the sensor has died. (I was getting low readings for a while, then nothing.) My mk1 F has the original black sensor (YCB100370), which you needed the large washer for (MDY100040). The black sensor has been superceded by the blue sensor (YCB100420). It also says that I need to fit the small washer (MDY100080). What I can't see anywhere is whether I fit the small washer instead of the large one, or do I need to fit both? Can anyone please advise?

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Replied by Notanumber on topic Mk1 F temp sensor for gauge.

Posted 8 months 1 day ago #204799
Best wait until someone more informed about Mk 1 Fs comes along but i could see no harm at all in trying it with both though i would assume it would normally only be fitted with the small washer. The engine block is common to both i believe

2003 TF 135 sunstorm

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Replied by Airportable on topic Mk1 F temp sensor for gauge.

Posted 8 months 1 day ago #204805
This type of sensor is remarkably reliable which is why we still use them & although performance can tail off, they are a thermistor which generally fail “here today gone tomorrow”; that sudden death is mechanical & not electrical.
Do you have a test meter to check its resistance cold & again hot? If you are seeing no difference in reading then it’s a right off & I’ll see if I can make sense of your predicament. I’ve a good sensor in the garage, I’ll check it out tomorrow.
M

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Replied by Airportable on topic Mk1 F temp sensor for gauge.

Posted 8 months 1 day ago #204807
And another thought is the sensor body becoming isolated from the block by oxide buildup or more likely the ever so popular sealant liberally applied when a miscreant drip has the temerity to appear.
It doesn’t take much for the sensor/block junction to become high resistance before the gauge starts to drop & pack up all together.
My spare alluded to earlier is a spare due to this very problem & that was one of the first jobs I attended to when I first had the car.
Short the sensor body to the block (jump leads?) & see if normal service is resumed.
M
Last Edit:8 months 1 day ago by Airportable
Last edit: 8 months 1 day ago by Airportable.

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Replied by mowog73 on topic Mk1 F temp sensor for gauge.

Posted 8 months 23 hours ago #204814
When using the blue sensor (YCB100420), fit the thinner washer (MDY100080), in place of of the thicker washer.

[size=10pt]Mark[/size]
95 MGF

by mowog73
The following user(s) said Thank You: David Aiketgate, Airportable

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