MK4 Golf TDI starts from cold with temp sender disconnected

Thanks for the help, has any one replaced this before, or know how to?

Is in the green part you are refering to?

Cheers

Alex

That is the early plug, pre mid 99 and so the connectors are easier to change. I can't tell if that is rust, copper grease (which it looks suspiciously like on the plug) or gold plating. If I change those terminals, I always use gold plated versions. If you try and buy them from VW you get a terminal fitted to a piece of yellow wire which is supposed to be soldered in as they don't trust spanner monkeys to do the job properly, with good reason. I buy the terminals from Würth (they are made by AMP) and I crimp them on. Those earlier ones are much easier to do than the later micro timer connections.

Hi,

Thanks for all the replies, much appreciated.

Would you reccommend that I get the green part and see how that goes, what is that part called? Also what is the correct name for the plug itself?
Is is a case of removing the current part and simply plugging a new one in? Would I need to disconnect the battery and drain some coolant from the engine?

Regards

Alex

PM me your reg or chassis number and I will post the part numbers.

That is the wrong sensor and plug for a 99 Bora, the sensor you have there is not the 059 919 501 A it should have and neither is it the earlier 059 919 501. Can you take it out and have a look to see what the VW part number is? Also, peel back that insulation on the wiring; I have a feeling there will be some soldering not far back, that isn't the original covering.

Didn't have any luck removing that green part, does it just pull out, I gave it some stick. Should I expect coolant to pour out, its Horizontally orientated. Will try again in morn.

You did slide out the clip? It then just pulls out and yes some coolant will be lost.

Will have another crack when im off again. Car is booked in for Cam Belt, Break discs, pads, water pump and service next week. Bank balance won't be happy, but will have peace of mind. :D

Cheers

Alex

Right, finally had a few minutes to have a go at this, the numbers on the green plug are - 059 919 501 (07-03) EH2 12V-140ma

As for the wiring, it goes back inside a plastic housing. Do I need to check this for soldering?

Cheers

Alex

i have this exact problem on my golf 115 2000, can someone tell me where my sensor is so i can check it please......

thanks