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Old 03-04-2015, 02:18 PM   #1
Nigel
 
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Default Mystery plug, any idea's ?

I've just replaced my auxilliary drive belt, I removed the radiator and intercooler as the radiator was clogged up with bugs. I was also going to replace the thermostat as I was under the impression it was stuck open.

The first thing I find is that there is no plug plugged into the thermostat housing, despite a search I couldn't locate any sign of the lead.

What I did find was a lead/plug that seems to go nowhere, it's the blue one in the pic. My first thought was that it was the missing lead but there seems no way that this is the one due to it's position..

Any idea's folks? though I'm more confused as to why there is no lead to the thermostat housing.

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Old 03-04-2015, 04:04 PM   #2
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Default Re: Mystery plug, any idea's ?

Water sensor connection for fuel filters that use them?
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Old 03-04-2015, 04:09 PM   #3
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Default Re: Mystery plug, any idea's ?

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Originally Posted by surlyoldbill View Post
Water sensor connection for fuel filters that use them?
Quite possibly, it would be in the right place. Doesn't look if it's ever been connected nor is there anywhere to plug it in.
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Old 03-04-2015, 04:18 PM   #4
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Default Re: Mystery plug, any idea's ?

The water sensor twists into the bottom of the fuel filter, and there is a vlavle on the side to drain water. YOUR filter doesn't have either of these as far as I can tell. Here in the States, the sensor version was standard, and some people have opted to go with a filter like yours to remove a couple areas known to allow air into the fuel lines. When they do that, they let the wires dangle. I don't know if UK Sprinters offered a water sensor equipped fuel filter system, but that's what it looks like to me. Tape it up to keep dirt out. I suspect the actual sensor got tossed with a fuel filter, whoever changed it didn't know it was supposed to be removed and used on the next filter.
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Old 03-04-2015, 04:24 PM   #5
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Default Re: Mystery plug, any idea's ?

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Originally Posted by surlyoldbill View Post
The water sensor twists into the bottom of the fuel filter, and there is a vlavle on the side to drain water. YOUR filter doesn't have either of these as far as I can tell. Here in the States, the sensor version was standard, and some people have opted to go with a filter like yours to remove a couple areas known to allow air into the fuel lines. When they do that, they let the wires dangle. I don't know if UK Sprinters offered a water sensor equipped fuel filter system, but that's what it looks like to me. Tape it up to keep dirt out. I suspect the actual sensor got tossed with a fuel filter, whoever changed it didn't know it was supposed to be removed and used on the next filter.
Thanks for clearing that up Bill, next job is to find out why there is no lead to the thermostat housing
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Old 03-04-2015, 06:28 PM   #6
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Default Re: Mystery plug, any idea's ?

My guess the plug is for the temp sensor, it just got pushed under the filter during a filter change, and might go to the temp sensor if repositioned
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Old 03-05-2015, 09:37 AM   #7
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Default Re: Mystery plug, any idea's ?

Nigel
If your temperature gauge is working you do not need the plug into the thermistor. If you temp gauge is not working then the wire must be tucked in there somewhere. the plug in the picture is for the water sensor. You have the wrong hose clamps on the fuel filter, those screw clamps will leak air when the motor is hot, this will lead to hard starting. Eric
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Old 03-05-2015, 12:46 PM   #8
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Default Re: Mystery plug, any idea's ?

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Nigel
If your temperature gauge is working you do not need the plug into the thermistor. If you temp gauge is not working then the wire must be tucked in there somewhere. the plug in the picture is for the water sensor. You have the wrong hose clamps on the fuel filter, those screw clamps will leak air when the motor is hot, this will lead to hard starting. Eric
Eric, the hose clamps are the one's on the vehicle when I bought it, but as you point out they are the wrong one's so I'll change them. However despite sub zero temperatures the van always starts on the turn of the key, as for heat, it's not something we have to worry about here in the UK!

The temperature gauge does work (of sorts) but only reaches 45c at best, either the thermostat is stuck open, the gauge is faulty or I need to plug something in. Work is not progressing well as I have to work outside and the windchill is around 1c today, but I need to get on with it one way or another. Thanks for your input.
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Old 03-05-2015, 01:48 PM   #9
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Default Re: Mystery plug, any idea's ?

Not that anyone asked...

As long as you aren't having problems I would buy the new clamps to have on hand, replace them once the weather improves into much higher temperatures. Disturbing things may result in problems. Especially when all the parts are very cold.

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Old 03-05-2015, 02:32 PM   #10
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Default Re: Mystery plug, any idea's ?

Quote:
Originally Posted by Nigel View Post
Eric, the hose clamps are the one's on the vehicle when I bought it, but as you point out they are the wrong one's so I'll change them. However despite sub zero temperatures the van always starts on the turn of the key, as for heat, it's not something we have to worry about here in the UK!

The temperature gauge does work (of sorts) but only reaches 45c at best, either the thermostat is stuck open, the gauge is faulty or I need to plug something in. Work is not progressing well as I have to work outside and the windchill is around 1c today, but I need to get on with it one way or another. Thanks for your input.
Don't be a big hurry to change those clamps. I've been using the same set of screw clamps for 250K miles with filter changes every 20k. No issues.
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