MK4 jettta engine advice

[dJ]

Re: MK4 jettta engine advice

Wouldn't changing your T-stat to a more sensitive/lower temp one help give you a more accurate reading? Mine opens rather early and keeps my temps down and I see my gauge changing all the time, especially during city driving, but still during highway pending if I'm drafting someone or leading the way.

[MechEngg]

Re: MK4 jettta engine advice

How would changing your t-stat affect the signals being transmitted analogly via your temperature sensor, then buffered through the ECU and output'd to the instrument cluster? I would be rather intrigued if your method somehow worked....
That being said why in the world are you using a lower temp t-stat in a TDI? I thought they already had a ridiculous problem keeping heat in in the winter months, having the t-stat open earlier will just allow the whole system to cool faster and you won't even reach operating temp if its cold outside. Your t-stat is designed in your cooling system to maintain a certain temperature, not to fluctuate the temperature a great deal depending on driving conditions, i would personally re-evaluate and see if that really is the right move for you.

[100%VAGitarian]

Re: MK4 jettta engine advice

not trying to be a dick, but the teacher has spoken.

[Geobmx4life]

Re: MK4 jettta engine advice

How would changing your t-stat affect the signals being transmitted analogly via your temperature sensor, then buffered through the ECU and output'd to the instrument cluster? I would be rather intrigued if your method somehow worked....
That being said why in the world are you using a lower temp t-stat in a TDI? I thought they already had a ridiculous problem keeping heat in in the winter months, having the t-stat open earlier will just allow the whole system to cool faster and you won't even reach operating temp if its cold outside. Your t-stat is designed in your cooling system to maintain a certain temperature, not to fluctuate the temperature a great deal depending on driving conditions, i would personally re-evaluate and see if that really is the right move for you.

I'm not sure about the gauge, but there a few guys with heavily modded TDI's that run cooler t-stats during the summer...then switch to hotter ones for the winter.

[dJ]

Re: MK4 jettta engine advice

How would changing your t-stat affect the signals being transmitted analogly via your temperature sensor, then buffered through the ECU and output'd to the instrument cluster? I would be rather intrigued if your method somehow worked....
That being said why in the world are you using a lower temp t-stat in a TDI? I thought they already had a ridiculous problem keeping heat in in the winter months, having the t-stat open earlier will just allow the whole system to cool faster and you won't even reach operating temp if its cold outside. Your t-stat is designed in your cooling system to maintain a certain temperature, not to fluctuate the temperature a great deal depending on driving conditions, i would personally re-evaluate and see if that really is the right move for you.

Remember....not everyone drives a stock TDI...These guys usually don't have issues keeping the car warm in the winter because they have a front mount in front of the rad, and usually drive harder to compensate. The t-stat is designed to open when the it senses that the car is getting to hot, allowing coolant to cycle through the rad. What difference does it make if its opening and closing often or just staying open most the time? My wifes golf has an OEM one in it and it just stays open as soon as it hits operating temperatures. Which is fine, because its stock and I could care less. Mine on the other hand is not stock, so I like the option for it to fluctuate.

[MechEngg]

Re: MK4 jettta engine advice

Remember....not everyone drives a stock TDI...These guys usually don't have issues keeping the car warm in the winter because they have a front mount in front of the rad, and usually drive harder to compensate. The t-stat is designed to open when the it senses that the car is getting to hot, allowing coolant to cycle through the rad. What difference does it make if its opening and closing often or just staying open most the time? My wifes golf has an OEM one in it and it just stays open as soon as it hits operating temperatures. Which is fine, because its stock and I could care less. Mine on the other hand is not stock, so I like the option for it to fluctuate.

1 - Why does your situations always involve conditions only suited to extremely modified TDI's?
2 - You provided zero answer to my question about how a lower opening t-stat would help to affect the accuracy of the CTS being read by the ECU like you had initially proposed.

[dJ]

Re: MK4 jettta engine advice

1 - Why does your situations always involve conditions only suited to extremely modified TDI's?
2 - You provided zero answer to my question about how a lower opening t-stat would help to affect the accuracy of the CTS being read by the ECU like you had initially proposed.

Changing the T-stat on a stock tdi could come out with the same outcome as my modified car. You don't have to be driving a modified TDI to run this t-stat. If the lower opening t-stat was used, it would just show you how the temps of the coolant change more frequently. Maybe that isn't what you were looking for? If its not, I'm sorry I wasted your valuable time.

[ryukin2000]

Re: MK4 jettta engine advice

hey guys, so i replaced the fan and it runs good now. only problem is the A/C doesn't work anymore. it just blows normal air. guess its shot. what is the typical cost to recharge the system?