Thread: TD5 Airconditioner efficiency.

Just to clarify, it's in a defender?

If so, late or early?

The systems are very different to each other.

I have both styles, I've done a lot of work on it and I've got the late one working frosty cold.

The other is not currently going.

Originally Posted by shack

Just to clarify, it's in a defender?

If so, late or early?

The systems are very different to each other.

I have both styles, I've done a lot of work on it and I've got the late one working frosty cold.

The other is not currently going.

Mine is a 2005 english built Defender TD5. It's a 110 so small air conditioner in a large white box.

It's got the locally attached under dash AC.

EDIT: This mornings revelation that despite having a new compressor the condenser fan was not working. "I know we checked that". Yep.. but it's not working now.

Originally Posted by Captain_Rightfoot

Mine is a 2005 english built Defender TD5. It's a 110 so small air conditioner in a large white box.

It's got the locally attached under dash AC.

EDIT: This mornings revelation that despite having a new compressor the condenser fan was not working. "I know we checked that". Yep.. but it's not working now.

The condenser fan only works under certain conditions, I can't remember what they are off the top of my head.

It's a mixture of ambient temp, road speed and coolant temp, or something along those lines.

If the weather is cool it may not come on, that's likely the car with yours.

Does yours have 2 4 position switches to control the fan and AC temp?

Originally Posted by shack

The condenser fan only works under certain conditions, I can't remember what they are off the top of my head.

It's a mixture of ambient temp, road speed and coolant temp, or something along those lines.

If the weather is cool it may not come on, that's likely the car with yours.

Does yours have 2 4 position switches to control the fan and AC temp?

Re the fan.. that was the update .. apparently it is working when it wants to work.

Yep, mine has the two switches. 0-3 fan and 0-3 AC.

Originally Posted by Captain_Rightfoot

Re the fan.. that was the update .. apparently it is working when it wants to work.

Yep, mine has the two switches. 0-3 fan and 0-3 AC.

So the condenser fan is working properly?


If you have the 2 4 position switches, you will also have a separate AC ECU.

Do you have a Nanocom?

I had a quick look for some info.

Unfortunately there is very little available on the AC system and ECU used in late TD5 defenders, so I'll give some D2 numbers for the HVAC ECU and hopefully they are at least similar.

For cooling when the AC is on in the D2, the condenser fan turns on when roadspeed is under 80kmh and ambient temp is over 28°c, it turns back off when roadspeed increases to 100kmh or ambient drops to 25°c.

I don't know if both figures need to be achieved for switching or not, but that gives you some info to work with.

It also serves to help with engine cooling when of the AC is off, but I won't get into those figures here.

I know I've lowered the operating switching temps on mine as I felt it was better to start cooling earlier.

Originally Posted by shack

So the condenser fan is working properly?


If you have the 2 4 position switches, you will also have a separate AC ECU.

Do you have a Nanocom?

I do have a nanocom but it's gen 1 and basically useless so let's say no.

I'm not aware of a second ecu.

Originally Posted by shack

I had a quick look for some info.

Unfortunately there is very little available on the AC system and ECU used in late TD5 defenders, so I'll give some D2 numbers for the HVAC ECU and hopefully they are at least similar.

For cooling when the AC is on in the D2, the condenser fan turns on when roadspeed is under 80kmh and ambient temp is over 28°c, it turns back off when roadspeed increases to 100kmh or ambient drops to 25°c.

I don't know if both figures need to be achieved for switching or not, but that gives you some info to work with.

It also serves to help with engine cooling when of the AC is off, but I won't get into those figures here.

I know I've lowered the operating switching temps on mine as I felt it was better to start cooling earlier.

As can be seen by my testing the other day - I'm seeing temps at 15 at the vent for extended idling on a warm day.

Can't we do better than that? I'm thinking I need to investigate a second fan that runs far more. maybe any time the ac is switched on.