coolant needle behavior, and no its not the temp. sender.
Thread Starter
Banned
Joined: Mar 2000
Posts: 34,209
Likes: 3
coolant needle behavior, and no its not the temp. sender.
Ive noticed this since doing my k04 install.
During normal operation the coolant needle is perfectly vertical, no surprise there. if I turn off the car and then restart it 1-2minutes later, the coolant needle will be 10-15deg past vertical(hotter). After a minute, the needle will go back to vertical.
I dont remember this happening when i was stock or chipped.
perhaps this is because there is air in the lines? Or maybe this is normal?
I remember reading somewhere that one of the reasons why the 1.8t A4 didnt get an afterrun pump is because the layout of the coolant system was designed to let natural convection to circulate the coolant (somewhat) upon shut down. Perhaps this is why hotter coolant is reaching the temp sender after shut down.
During normal operation the coolant needle is perfectly vertical, no surprise there. if I turn off the car and then restart it 1-2minutes later, the coolant needle will be 10-15deg past vertical(hotter). After a minute, the needle will go back to vertical.
I dont remember this happening when i was stock or chipped.
perhaps this is because there is air in the lines? Or maybe this is normal?
I remember reading somewhere that one of the reasons why the 1.8t A4 didnt get an afterrun pump is because the layout of the coolant system was designed to let natural convection to circulate the coolant (somewhat) upon shut down. Perhaps this is why hotter coolant is reaching the temp sender after shut down.
Head Cat Herder
Joined: Oct 1998
Posts: 66,550,462
Likes: 103
That's completely normal. What happens when you shut off the hot engine, the coolant stops flowing..
the engine actually gets HOTTER as it sits there, the water absorbs the heat, but it goes way above the normal operating temp.
It's really not anythign to worry about, provided the temps go down as soon as you start the car up agian.
You are seeing this now more than before mostly because you are working your engine a LOT harder than in stock form.
It's really not anythign to worry about, provided the temps go down as soon as you start the car up agian.
You are seeing this now more than before mostly because you are working your engine a LOT harder than in stock form.
Trending Topics
AudiWorld Stories
Bringing Audi to Life for Audi Fans
Top 10 Most Expensive Audis Ever Sold on Bring-A-Trailer
Brett Foote
10 Audi Features & Options We Miss the Most!
Joe Kucinski
Audi Recreates Crazy-Looking Speed Record Breaker From 1935
Verdad Gallardo
Coachbuilder Recreates the 1995 Audi TTS Concept
Verdad Gallardo
Every Audi V10 Car Ranked!
Joe Kucinski
9 Audi Designs That Aged Like Fine Wine
Verdad Gallardo
2026 Audi Q5 Buyer's Guide (Every Model Explained)
Brett Foote
Ranking Every Current Audi 'S' Model From Worst to First!
Joe Kucinski
10 Best Audis That are FINALLY LEGAL to Import to the U.S.!
Joe Kucinski
AudiWorld Super User
Joined: Aug 2000
Posts: 5,278
Likes: 0
Keep in mind the temp gauge dead zone.
there's like a 10 degree dead zone with the needle straight up. Likely what you are seeing is the coolant temp is slightly on the high side at shut down, coolant temp continues to climb after shutdown (this is normal, block is still hot), and then when you restart your slightly high of the deadzone.
To confirm this use the climate control or VAG to track the actual temp changes. There should be an article in the tech section on unlocking the climate control secrets.
when was the last coolant change?
To confirm this use the climate control or VAG to track the actual temp changes. There should be an article in the tech section on unlocking the climate control secrets.
when was the last coolant change?
