Coolant temperature goes down when cruising on highway
Thread Starter
AudiWorld Member
Joined: Aug 2005
Posts: 11
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Coolant temperature goes down when cruising on highway
Hi all,
I have a european 1989 200 20VT Quattro.
I noticed recently that when cruising on highway or in the city without stop and go traffic the coolant temperature goes down from 90C to 75-80C.
(the outside temperature is quite low here right now -5,-10C).
The temperature gauge is ok, the sender is new and also working fine, the thermostat is also new and fine, the coolant have also been replaced.
The car is running fine, there is no problem with it.
Is this normal that it goes down instead of keeping it at 90C?
Is it possible that this lower 80C coolant temperature can increase fuel consumption?
Thanks in advance!
Cheers!
Norbert
I have a european 1989 200 20VT Quattro.
I noticed recently that when cruising on highway or in the city without stop and go traffic the coolant temperature goes down from 90C to 75-80C.
(the outside temperature is quite low here right now -5,-10C).
The temperature gauge is ok, the sender is new and also working fine, the thermostat is also new and fine, the coolant have also been replaced.
The car is running fine, there is no problem with it.
Is this normal that it goes down instead of keeping it at 90C?
Is it possible that this lower 80C coolant temperature can increase fuel consumption?
Thanks in advance!
Cheers!
Norbert
AudiWorld Senior Member
Joined: Sep 2006
Posts: 1,140
Likes: 0
Re: Coolant temperature goes down when cruising on highway
No it is not "normal". Yes it can cause increased fuel consumption.
The T-stat should react to the temp. of the coolant and open and close based on it's temp, not the metal around it. If it's not than its not working properly.. or is getting stuck at a point in its open/close span.
The increase in fuel is do to the change in temp. The ECU "sees" the car as cold and goes back into closed loop.. adding more fuel to the mix to get it to heat back up.. (just like a cold start in the morning).
The T-stat should react to the temp. of the coolant and open and close based on it's temp, not the metal around it. If it's not than its not working properly.. or is getting stuck at a point in its open/close span.
The increase in fuel is do to the change in temp. The ECU "sees" the car as cold and goes back into closed loop.. adding more fuel to the mix to get it to heat back up.. (just like a cold start in the morning).
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