Reduced engine performance

Post by **jonesg** » 24 Jun 2017, 12:20

Yeh I did use the AC the day before, I rarely ever use AC.
It drives perfectly normal now, all codes and warnings gone.
The cooling fan was slightly out of position, its that or the AC.
All THAT for a fuse.

Post by **mrbrian200** » 25 Jun 2017, 12:28

I think it's safe to conclude the problem is likely the compressor clutch coil.

You might also try replacing relay in the engine compartment labeled 'climate control system' in the chance it's primary winding is bad/causing a short to ground. It gets +12v from that fuse for both the coil and the high current switch to the compressor. The ECU controls this relay by completing the coil ground circuit.

If you conclude the compressor clutch coil is at fault you can pull this relay to prevent the climate control system from energizing the AC compressor and triggering limp mode. +12v split/junction to the accelerator pedal position sensor and ECU fan is after the fuse but before this relay. Everything after that junction is dedicated to controlling the AC compressor clutch. The ECU may sense an open circuit for the missing relay coil and a DTC but this should not trigger limp mode or a CEL.

earthworm · Post by **earthworm** » 16 Jan 2020, 15:26

Three years later .. WHAT was the problem ? I have VERY SERIOUS reduced engine performance AND, the radiator fan seems NOT to work when it should , in my opinion .. The temperature gage stays on top dead center when the engine is fully warmed ... .. WHAT is meant by "e box" ? Do the two computers have a cooling fan ?

earthworm · Post by **earthworm** » 16 Jan 2020, 18:22

Three years later, any closure .. for absolute certain ? I have very similar problems resulting in ''reduced engine performance" No power above 1500 rpm ! Also still no engine cooling fan activity , but I do not THINK its overheating ! .
2003 Volvo S60, T, 5, AWD, 140K

Post by **shiloh51933** » 18 Jan 2020, 08:46

earthworm wrote: 16 Jan 2020, 18:22 Three years later, any closure .. for absolute certain ? I have very similar problems resulting in ''reduced engine performance" No power above 1500 rpm ! Also still no engine cooling fan activity , but I do not THINK its overheating ! .
2003 Volvo S60, T, 5, AWD, 140K

Have you scanned your ECM for DTC's yet?
The "Reduced Engine Performance " can be triggered by various symptoms, need more info to offer suggestions.

EngineeringBloke · Post by **EngineeringBloke** » 20 Jan 2020, 14:15

Earthworm, please start a new thread for your issue. The fan here is 2 or 3 inches across and is in a hood attached to and cooling the engine and transmission circuit boards in the box next to the power steering and coolant tanks. This thread does not concern the 2 foot wide main engine cooling fan that is not working for you.