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Old 06-09-2021, 07:56 PM   #1
DragonRM
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Member#: 14365
Join Date: Jan 2002
Chapter/Region: RMIC
Location: Arvada, CO
Default Weird coolant/ambient temp reading.

Didn't have winter tires for my 2007 sti so I didn't drive it as much this last winter but it still got some road time. I noticed the coolant temps were a bit higher than I was used to seeing for the outside temps and then today when it was 90f out my ambient temp gauge would only go up to about 77... I've been an Audi Master Guild tech for years and I know we get some odd cooling behavior sometimes when the ambient sensor goes out. Could these 2 issues be related on this model year? Definitely seemed to keep coolant temps down about 10 degrees when I had my a/c on and the fans were forced to run.
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Old 06-10-2021, 07:43 PM   #2
AliBenn
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Member#: 487
Join Date: Nov 1999
Chapter/Region: TXIC
Location: Greatwood/Sgrlnd
Vehicle:
1998 /2005 STunIcorn
Acadia Green RS-T

Default

If your Audi technician
Im going to state answer in the IMO form

-the two are not related
On my 05 swap, temp sensor reading on my 05 cluster all over the place
Sometimes dashes sometimes a temp
And I do not have a sensor
I just put the remote V1 read out in front of temp reading so does not piss me off everytime I drive
-Subies (at least the ones im familiar with) not ones with air pumps mind u, have one/two speed fans. I bet Audi has 6spd fans.
If AC turned on, both fans come on, more cooling occurs.
Possible this is what u encountered with temp drop.

Assuming u have a temp gauge?
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Old 06-11-2021, 02:36 PM   #3
DragonRM
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Join Date: Jan 2002
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Location: Arvada, CO
Default

Yeah... The coolant temp over the last few weeks was higher than last year at around this time by around 5-10 degrees so I was planning on swapping out the tstat before too long but when I thought about it they happened at the same time which is weird. Just made me wonder if the ambient temp sensor had any affect on fan activation. Most Audis are 2 speed as well... Fans will typically come on around 95-105c depending on model year/model.
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