Engine Temp. Goes Up/Down 2 Codes
Thread Starter
Audiworld Junior Member
Joined: Apr 2012
Posts: 11
Likes: 0
Engine Temp. Goes Up/Down 2 Codes
Car: 2004 Audi A4 1.8T FWD 4Cyl. 90,000 miles
The cars temperature is normal ( at half way mark ) but once the A/C cold is turned on, the engine temp. gauge shows a significant drop, to the 1/4 mark.. stays that wait til I turn the cold off, then starts going back up to the half way mark. ( started happening around 70,000 miles )
My check engine light is on. Two codes:
P2181- Cooling System Performance
P0118- Engine coolant temp circuit high input.
I was told that this is normal because when the AC cold kicks in so do the cooling fans which cool the engine and that is why I see the significant temp. drop on the gauge.
But at the same time I am thinking the thermostat is not operating 100% because the engine temp. should be at the half way mark AT ALL TIMES.
Another problem might be the engine cooling sensor.
The cars temperature is normal ( at half way mark ) but once the A/C cold is turned on, the engine temp. gauge shows a significant drop, to the 1/4 mark.. stays that wait til I turn the cold off, then starts going back up to the half way mark. ( started happening around 70,000 miles )
My check engine light is on. Two codes:
P2181- Cooling System Performance
P0118- Engine coolant temp circuit high input.
I was told that this is normal because when the AC cold kicks in so do the cooling fans which cool the engine and that is why I see the significant temp. drop on the gauge.
But at the same time I am thinking the thermostat is not operating 100% because the engine temp. should be at the half way mark AT ALL TIMES.
Another problem might be the engine cooling sensor.
AudiWorld Senior Member
Joined: Mar 2005
Posts: 809
Likes: 3
Car: 2004 Audi A4 1.8T FWD 4Cyl. 90,000 miles
The cars temperature is normal ( at half way mark ) but once the A/C cold is turned on, the engine temp. gauge shows a significant drop, to the 1/4 mark.. stays that wait til I turn the cold off, then starts going back up to the half way mark. ( started happening around 70,000 miles )
My check engine light is on. Two codes:
P2181- Cooling System Performance
P0118- Engine coolant temp circuit high input.
I was told that this is normal because when the AC cold kicks in so do the cooling fans which cool the engine and that is why I see the significant temp. drop on the gauge.
But at the same time I am thinking the thermostat is not operating 100% because the engine temp. should be at the half way mark AT ALL TIMES.
Another problem might be the engine cooling sensor.
The cars temperature is normal ( at half way mark ) but once the A/C cold is turned on, the engine temp. gauge shows a significant drop, to the 1/4 mark.. stays that wait til I turn the cold off, then starts going back up to the half way mark. ( started happening around 70,000 miles )
My check engine light is on. Two codes:
P2181- Cooling System Performance
P0118- Engine coolant temp circuit high input.
I was told that this is normal because when the AC cold kicks in so do the cooling fans which cool the engine and that is why I see the significant temp. drop on the gauge.
But at the same time I am thinking the thermostat is not operating 100% because the engine temp. should be at the half way mark AT ALL TIMES.
Another problem might be the engine cooling sensor.
Thread
Thread Starter
Forum
Replies
Last Post
volvopentaman
A8 / S8 (D3 Platform) Discussion
60
Mar 1, 2020 07:42 PM
TicketProof
A4 (B5 Platform) Discussion
4
Jan 30, 2002 01:48 PM
