Noted today fan running at 300 RPM with engine at 600 RPM, throttle to 3000 RPM and fan would not go above 1200 RPM. Ran an SDD session and commanded fan to run over 3000 RPM and it did, roaring to life as I have heard it do on rare occasions...

So, it appears the fan works as far as being able to run at high RPMs, the question's when's it supposed to? Does the AC specialist have a valid observation or is it normal for the fan to run at low RPM regularly AND is it normal for it to run at all times, never stopping?

 

Still seeking help with this. The fan does run at full speed on rare occasions, typically when ambient temp's above 90F and the engine's been running stationary for some time.

BUT here's the concern, climate system's head pressure's running above 300 PSI until the fan turns on briefly up to 10 minutes after idling. Once the fan starts running, head pressure drops to a reasonable measurement but then quickly climbs back up once the fan stops running again.

The AC specialist insists this isn't good for the longevity of the climate system and that the fan should be running more frequently to keep condenser temps down which in turn keeps head pressure down.

Makes sense as I've had issues with the climate system making cold air when stationary.

Anyone know the answer to this?

 

Still watching your thread. Nothing of importance to add. Sounds as if you found the right air conditioner specialist, to me.
I for one keep the airconditioner running whenever the humidity level is above 50%; no matter what the ambient temperature.
It does sound as if the programming of the module is off. I wonder if its expecting input from a temperature sensor and not getting one??

 

Unfortunately they don't service Land Rover, so I'm on my own. They're a very reputable shop with an older, well seasoned staff, so certainly a fantastic source for knowledge in general, something lacking from many franchise main dealers.

His suggestion was to figure out what sensors are part of the command for the fan speed and see if any are out of range or see if there's a software update for the fan.

 

Yes, that's its primary purpose. ECT's usually over 200F, but with the AC on or off, the fan rarely runs at full speed as noted above. So yours runs at high or full speed when you've got the climate on?

 

I've purchased another new fan and will fit it this weekend (waiting for another unrelated part to do all at once) hoping to see a difference because condenser's blazing hot (new laser thermometer arriving tomorrow so I can check actual temp) and compressor pressure's running nearly 100 psi higher than normal unless the condenser's cooled with water or flowing air.

 

Depending on year a model .. I'd bet..Your motor mounts are settled ..not necessarily bad... and the fan is rubbing the bristles on the shroud ..(bottom)...therefore not letting it spin... I know this is an old thread just wanted to put the info out there for anyone searching for a answer.. I've seen this many times. Rip them bristles out and see if it spins..🙃

 

There aren't any bristles on mine and the issue was resolved after I fitted another new expansion valve on the evaporator. Fan's been running at various speeds all the time as it should.

 

Resurrecting this thread because I'm experiencing the exact same symptoms on my 2016 LR4. When I first start it on a hot day, the AC blows hot until I actually start moving, then it starts to blow cold. I observed that when sitting at idle, the fan is not running when the AC is on after first stating it up. But, after driving for a few minutes, I can park and idle and the fan will run and the AC is cold. I know the fan itself is working fine. It's as if there's some programming telling the fan to not until it's moving.

Did replacing the expansion valve fix your issue? Seems like it wouldn't be directly related.

 

Yes, it fixed it.