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Replacing A Zetec Water Temp Sender Unit


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REPLACING A ZETEC TEMP SENDER UNIT

 

 

 

 

 

 

 

 

On my Mk6 Zetec the Temperature Gauge had not been reading correctly for a while and not showing the car getting hot, so I decided to sort it out.

 

Firstly heres where to find it:

 

 

 

 

watertemp1.jpg

 

 

 

 

 

 

 

Close up, its the brass nut with the plug on the end.

 

 

 

 

S7000817.jpg

 

 

 

 

 

 

 

 

 

To check that it is actually the sender unit that is faulty you need to bridge the connections on the sender unit plug.

 

 

 

 

S7000822.jpg

 

 

 

 

 

 

 

 

A piece of wire or somthing similar will do the trick, you should then see the temp gauge has gone up to the red,

if this is the case your sender unit is knackered.

 

 

 

Step 1: Drain the coolant, idealy when the Engine is COLD otherwise your going to get burnt, to do this remove the little plastic plug, on radiator inside the engine bay to the right.

 

 

 

Step 2: Remove the Thermostat to allow easy acess to the Sender Unit, its 3X 10mm bolts.

 

 

 

 

S7000824.jpg

 

 

 

 

 

 

 

 

 

The Plug to the Coil Pack and Thermostat where also removed.

 

 

Step 3: Remove the Sender Unit and replace for the new one, it has a 22mm thread old for new.

 

 

 

 

 

S7000823.jpg

 

 

 

 

 

 

 

 

 

Step 4: Replace Thermostat and plug in all the Connections and Plugs.

 

 

Step 5: Fill car up with fresh Coolant to between the Max and Min level, I then stated the car and topped up the Coolant as nessisary due to air locks, mine went down quite a bit so keep an eye on it as if you don't remove the air-locks you run the possibility of a Head Gasket Failure, the Temp Gauge should now work as it should.

 

 

 

 

Originaly posted in the Wiki Section by MarkeyBoy

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  • 2 years later...
  • Admin

With reference to changing the sender unit for the temperature gauge, I carried out this job on my 1.6 Zetec engine three weeks or so ago. I undid the top hose, and moved it to one side, then I undid the smaller hose underneath, and moved that to one side, then put a ring spanner on the sensor and unscrewed it. It was as easy as pie.

When fitting the new unit, I wound a few turns of white plumber's tape around the thread, and screwed it back in and tightened it up firmly with a ring spanner. I topped up with antifreeze/summer coolant and that was it. It was all up and done in less than twenty minutes. I never found any need to remove the thermostat housing, - and never even considered I would need to do so. Many thanks, Cooderkey.

 

PS I bought the unit from an eBay seller called ' transitpartsuk '. This was a very friendly and efficent business seller. They shipped quick, and were not expensive, and the staff were brilliant and seemed to know what they were doing.

Edited by Cooderkey
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  • 2 years later...
  • 3 years later...
  • 10 months later...

Hmm Im confused there is a  sender unit on the thermostat housing ( as you describe ) normally with a black or grey top,  ?? ( replaced mine with a grey top as the old one had a grey top ) Does this send the coolant temperature information to the gauge in the car dash ?

Or is it the sensor unit that is located on the front of the engine block near the bottom ? ( mine is a left hand drive and sits on the bottom half of the block, on the right hand side of the exhaust manifold looking from the front  )

So I think I have the wrong sensor somewhere I've ordered a new front engine block sensor, Which I was told by Ford is OEM No. 6196668 and that sends the coolant temperature information to the car gauge not the sensor on the thermostat housing ? 

 WHICH sensor ( sender ) does what ? Does one do the gauge and one go to the ECU ? why are there 2 sensors that people are telling me to do the same job ?

If you read my post regarding this,  my car is now always showing the temperature almost in the red on the car gauge ( since doing a system drain due to a head gasket replacement)  although she does not seem to overheat or loose coolant ?  

There is also another thermostatic sensor for operating the electrical fan ( that seems to work correctly ) near the top of the radiator in the top hose, I have also replaced this just in case this was faulty,  but again have been told there are different types ? mine had a red top but not sure if this is also correct it may have been replaced in the past incorrectly ?

 

CONFUSED.COM

 

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