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25th May 2017, 11:17 | #1 |
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KV6 coolant temp sensor location
I am sorting a cooling issue on a V6 that I have recently got. Just spoke to the previous owner and the coolant temperature sensor was replaced. When I have looked they have plugged it in next to the coolant pipes on the engine block but not connected the other side.....
I cant quite see where it plugs in does anyone have a diagram or know where it goes. I have removed enough to get it but don't want to remove the manifold just to plug it in This is the sensor I mean https://www.dmgrs.co.uk/products/oem...45-75-zr-zs-zt it is plugged into the sensor but not they did not connect the harness. |
25th May 2017, 11:32 | #2 |
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Does the fan run when you start the engine? If the sensor isn't sending a signal to the ECU, it will trip on the emergency cooling program.
The sensor is located on top of the engine, near the thermostat housing (between the 'V'). What do you mean by 'plugged in' next to the pipes, but 'not connected' the other side'? Is there not a wiring harness plugged into the end of the sensor? |
25th May 2017, 11:52 | #3 |
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Thanks. It is connected to the sensor i.e in the V next to the thermostat but I assume when changed they forgot to connect the other end of the harness
As this picture in post 2 https://the75andztclub.co.uk/forum/s...ad.php?t=37359 it is plugged in as here but the other end of the harness is not connected. Last edited by Dominic22; 25th May 2017 at 11:58.. |
25th May 2017, 12:18 | #4 | |
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Does the temperature gauge stay in its ignition-off position? TC |
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25th May 2017, 12:40 | #5 | |
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All function ok other than pressure in the tank so coolant is not cycling around I have I just need to see where it plugs in as I they have changed the sensor but not plugged it in.... I cannot see a photo or haynes where the harness connects |
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25th May 2017, 15:21 | #6 | |
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Dominic,
I understand what you're asking and you're right, the wiring from the sensor connector is short and terminates just to the rear of the right-hand bank where there is another connector buried underneath the plastic inlet manifold chamber. However, in reply to T-Cut's question you said that the temperature gauge does not remain in the full cold position when the engine is warm. Have I understood that correctly? If the gauge needle is rising towards the mid-position as the engine warms then the sensor must be connected. Quote:
Why do you believe that the coolant isn't "cycling around"? It will circulate provided that the water pump impeller hasn't dropped off its shaft! Simon
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25th May 2017, 17:05 | #7 | |
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From what you've said, the temperature gauge seems to be working and will provide important clues. Does the gauge sit at 'normal' (9 o'clock position) when driving? If so, the coolant is circulating. This fact is unequivocal. If there were no circulation, the gauge would hit the red line in a few minutes. Pressurisation of the header when the engine's running is a natural consequence of the sealed coolant system getting hotter. The hotter it gets, the higher the internal pressure. The system runs quite normally up to 22psi or so using a '140' pressure cap. It's designed to do that and the cap shouldn't be touched other than for checking the fluid level when the engine is completely cold. I honestly think your concern about the sensor harness is unfounded, unless there's another temperature related issue you've not mentioned. TC |
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26th May 2017, 14:13 | #8 |
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Apologies for the late reply and the hurried one now. I have uploaded a few photos of the connector I mean I will have a good look over the weekend and report back. Here is a link to the photo. I just assumed it must be plugged into something.
Maybe they have wired it differently. What led me to believe there is an issue is that I was sure that when the car was running coolant would come out the little hole top left of the tank and recirculate, is that not the case. https://goo.gl/photos/kb36iZZkfQ4ty39Y8. Last edited by Dominic22; 26th May 2017 at 14:18.. |
26th May 2017, 15:41 | #9 | |
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I'm unfamiliar with the V6 so can't comment on the plug in the photo. Can you confirm that the temperature gauge points at 'normal' when driving? What circumstances did you notice pressure in the header tank? TC |
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16th May 2022, 20:37 | #10 | |
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