bing
Active Member
- Joined
- Nov 20, 2010
- Messages
- 633
- Location
- london
- Car
- W124.036 E500 (Sold) W140 S600L (Sold) W163 ML270 CDI 2004 (SOLD)W208 CLK55
Are you sure the fan is engaging ?
The mechanical fan clutch will be fully engaged with the engine temp at 90C, and
probably will have engaged at a lower temp. If it's not engaged by 90C, it's defective. With the car in park and temp at 90C or higher, pop the hood/bonet, and rev the engine slowly. The fan should roar loudly up to ~3500rpm, you can hear it disengage by 4000rpm, then let the revs drop slowly and the fan should re-engage by ~3000rpm. If yours doesn't do this, either the clutch is bad, or there is a blockage directly ahead of the clutch as it needs hot air to trigger the bimetal strip.
The mechanical fan clutch will be fully engaged with the engine temp at 90C, and
probably will have engaged at a lower temp. If it's not engaged by 90C, it's defective. With the car in park and temp at 90C or higher, pop the hood/bonet, and rev the engine slowly. The fan should roar loudly up to ~3500rpm, you can hear it disengage by 4000rpm, then let the revs drop slowly and the fan should re-engage by ~3000rpm. If yours doesn't do this, either the clutch is bad, or there is a blockage directly ahead of the clutch as it needs hot air to trigger the bimetal strip.