early 2000 Audi TT 180hp (atc) TWO coolant temp sensors
#1
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Hey everyone just wanted to post about something that was seemingly impossible to find on the internet. I have an early 2000's audi tt quattro (180hp version) that seems to be different from EVERY other 8n out there in a few ways. One of those is that I have two coolant temp sensors: one is a 4 pin blue (square, not the oval square in the typical 8n), and the other is a 2 pin white (rectangle) just down the same coolant line closer to the radiator. I could barely find the first sensor, but it took me a week or two to find the second, even with all the posts in the mk1 discussion. I was able to find both of these sensors through parts geek. The first 4 pin is in a few places but the 2 pin I can only find in one place.
4 pin blue - 2000 Audi TT Water Temperature Sender - 919-002 Replacement
https://www.partsgeek.com/ss/?i=1&ss...Sender&x=0&y=0
2 pin white - 2000 Audi TT Quattro HVAC Temperature Control Switch - SKTS369 SKP
https://www.partsgeek.com/catalog/20...html?brand=skp
(props to anyone that can explain what this is???)
Hope this helps someone out!
4 pin blue - 2000 Audi TT Water Temperature Sender - 919-002 Replacement
https://www.partsgeek.com/ss/?i=1&ss...Sender&x=0&y=0
2 pin white - 2000 Audi TT Quattro HVAC Temperature Control Switch - SKTS369 SKP
https://www.partsgeek.com/catalog/20...html?brand=skp
(props to anyone that can explain what this is???)
Hope this helps someone out!
#2
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The second one says it's a HVAC Temperature Control Switch. HVAC is not a "coolant" temperature sensor. It's for the temperature of your HVAC. Heating and cooling of the inside of your car etc.
#3
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#4
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Meh apples to oranges. If you type in coolant into google it does not come up with Freon. The car is over engineered. I’m pretty sure when it malfunctions or the hvac is about to explode the mil light will come on. Saving you from catastrophic failure. Shame that scheme wasn’t implemented on the timing belt.
#5
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Hey everyone just wanted to post about something that was seemingly impossible to find on the internet. I have an early 2000's audi tt quattro (180hp version) that seems to be different from EVERY other 8n out there in a few ways. One of those is that I have two coolant temp sensors: one is a 4 pin blue (square, not the oval square in the typical 8n), and the other is a 2 pin white (rectangle) just down the same coolant line closer to the radiator. I could barely find the first sensor, but it took me a week or two to find the second, even with all the posts in the mk1 discussion. I was able to find both of these sensors through parts geek. The first 4 pin is in a few places but the 2 pin I can only find in one place.
4 pin blue - 2000 Audi TT Water Temperature Sender - 919-002 Replacement
https://www.partsgeek.com/ss/?i=1&ss...Sender&x=0&y=0
2 pin white - 2000 Audi TT Quattro HVAC Temperature Control Switch - SKTS369 SKP
https://www.partsgeek.com/catalog/20...html?brand=skp
(props to anyone that can explain what this is???)
Hope this helps someone out!
4 pin blue - 2000 Audi TT Water Temperature Sender - 919-002 Replacement
https://www.partsgeek.com/ss/?i=1&ss...Sender&x=0&y=0
2 pin white - 2000 Audi TT Quattro HVAC Temperature Control Switch - SKTS369 SKP
https://www.partsgeek.com/catalog/20...html?brand=skp
(props to anyone that can explain what this is???)
Hope this helps someone out!
#6
AudiWorld Junior Member
Thread Starter
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can you possibly provide pictures of the location of the second sensor.. the HVAC temp switch? I cannot remember or seem to find where I disconnected mine from. Have been trying to remember for a cpl days now and no success. Its the last thing in the way of putting the car back together after replacing both the coolant flange and pipe connector. Thanks in advance!
![](https://cimg0.ibsrv.net/gimg/www.audiworld.com-vbulletin/2000x1124/1717104633902499323948205217568_69a8d1c9d47e2eacd08d079ef43c0c1af0aaec20.jpg)
Location of coolant temp sensor and hvac temp switch on 2000 audi tt 8n ATC (Index finger coolant temp, thumb hvac)
Reminder that i believe these are both integrated into one for the newer models with the green temp sensor
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