That is correct. The fan clutch should engage for the first few minutes after starting the engine, as well as whenever the engine is running above 3000 RPM.
It remains engaged if any of the following conditions is true: 1) The first two minutes of operation 2) Coolant temperature is above 79°C 3) Engine runs above 3000 RPM So if the engine has been running for a while and the coolant temperature is below 79°C, the fan clutch will engage whenever the engine RPM goes above 3000 and will disengage whenever it drops below 3000 RPM
The clutch should NOT "engage over 3000rpm". It is only controlled by temperature. When it is in engaged state, it should also LIMIT the fan speed to 2400rpm (approx) regardless of engine speed.
sorry for bugging you. last question! here are two videos. this /watch?v=GccBciJr3gU is filmed with a engine just started. i can stop the fan this /watch?v=yeA48CeB5F0 is filmed with the engine on idle for 5 minutes, onces revved to 3000 rpm and coolan temp just 55 celsius. as you can see i cannot stop the fan on the second video... so my clutch is working on cold start but then fails, after first 3000 rpm? thanks!
Your car is an X5? I do not know if it is supposed to behave the same as an M5. On E39 M5's the jet-like sound usually means a bad fan clutch, but your description is showing that it does disengage sometimes. Sorry I can't help you much.
That is correct. The fan clutch should engage for the first few minutes after starting the engine, as well as whenever the engine is running above 3000 RPM.
It remains engaged if any of the following conditions is true:
1) The first two minutes of operation
2) Coolant temperature is above 79°C
3) Engine runs above 3000 RPM
So if the engine has been running for a while and the coolant temperature is below 79°C, the fan clutch will engage whenever the engine RPM goes above 3000 and will disengage whenever it drops below 3000 RPM
and we got this "jet taking off" sound... i always though it should disengage and be like in your video
The clutch should NOT "engage over 3000rpm". It is only controlled by temperature. When it is in engaged state, it should also LIMIT the fan speed to 2400rpm (approx) regardless of engine speed.
If it is happening below 3000 RPM then chances are the fan clutch has seized and needs replacement. Check out m5board.com for more information.
This video shows a fan clutch NOT in action? It is disengaged.
sorry for bugging you. last question! here are two videos.
this /watch?v=GccBciJr3gU is filmed with a engine just started. i can stop the fan
this /watch?v=yeA48CeB5F0 is filmed with the engine on idle for 5 minutes, onces revved to 3000 rpm and coolan temp just 55 celsius.
as you can see i cannot stop the fan on the second video...
so my clutch is working on cold start but then fails, after first 3000 rpm?
thanks!
can it be okay when starting the engine but after revving to 3000 turns it gets seized and not disengage ?
okay, so it engages above 3000 rpm, but then what? disengage or remains engaged?
Your car is an X5? I do not know if it is supposed to behave the same as an M5. On E39 M5's the jet-like sound usually means a bad fan clutch, but your description is showing that it does disengage sometimes. Sorry I can't help you much.