TD5 Airconditioner efficiency.

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Originally Posted by BradC

That looks like a conventional parallel flow.

In a car, anything you can do to reduce the condensation temperature is a bonus. Hiding it behind the intercooler is not going to help.

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It could be Brad, I haven't even looked at the picture I took! Just took it as I was walking past and kept going, I was however informed that the first series of TD5 had a serpentine.. So I've got into trouble "assuming"....

Early TD5 defenders have the intercooler in front of the condenser, late have it the other way around, possibly to incorporate the fan.

The old 300tdi had the intercooler off to the side.

I'm actually wondering now if the condenser in the latter ones is a little smaller.

I have an aftermarket one in mine which is a fair size, it couldn't fit a much bigger unit, I also have a genuine original that I'll check out later.

And here is a serpentine flow condensor off a 2005 Defender

Attachment 193299

ok just spent some time looking at Schoedingers fan. I did get to see it run, but I was unable to determine what the trigger for it to run was. Sometimes it would sit there running indefinitely and not run, while the condenser got quite hot. Sometimes you'd start it up and it would run immediately.

I played around swapping relays and that didn't seem to make any difference.

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Originally Posted by Captain_Rightfoot

And here is a serpentine flow condensor off a 2005 Defender

Attachment 193299

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I've been hunting around for a couple of spare condensers I have, finally found them.

Apologies, I've made a couple of blunders on this thread... Par for the course at the moment.

The early defenders OFTEN have a parallel condenser and no fan.

The late ones with factory air had a serpentine condenser and cooling fan.

My work vehicle is a late one and has a parallel flow (not standard)and fan, so literally anything could be installed now.

Quote:

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Originally Posted by Captain_Rightfoot

ok just spent some time looking at Schoedingers fan. I did get to see it run, but I was unable to determine what the trigger for it to run was. Sometimes it would sit there running indefinitely and not run, while the condenser got quite hot. Sometimes you'd start it up and it would run immediately.

I played around swapping relays and that didn't seem to make any difference.

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Regarding what triggers the fan to run, I think I explained that earlier in this thread.

Quote:

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Originally Posted by Captain_Rightfoot

ok just spent some time looking at Schoedingers fan. I did get to see it run, but I was unable to determine what the trigger for it to run was. Sometimes it would sit there running indefinitely and not run, while the condenser got quite hot. Sometimes you'd start it up and it would run immediately.

I played around swapping relays and that didn't seem to make any difference.

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Assuming the engine was cold (or at least not hot at that time) the condenser fan should only be operated by the AC. According to shack's observations 225 psi turns the fan on which should equate to a temperature of 55c. That is quite hot indeed :) Try and measure the temperature when observing the fan. If the fan does not switch on within specs I guess something is wrong with the system. Could be anything from the trinary switch to the small logic board that shack has troubles with.

In any case, also try and jump the relais for the fan, it should then always run regardless of ECU input, if your AC is cool then, at least you got a work around for your desert trip :)

Cheers,
-P

While I'm waiting for other parts to arrive I've done a bit more on the system, today the switches. This is the globe for the backlight on them, would anyone like to have a good at what it is? 12v.

I'll order some new ones when I work out what they are.https://uploads.tapatalk-cdn.com/202...55286f6ba2.jpg


Edit: I think they are called a "grain of wheat bulb". Or rice etc etc

Yeah, grain of wheat.

12V Grain Of Wheat Globe 6x3.2mm - Altronics

Not to be confused with cob which is not corn cob but Chip On Board LED.[biggrin]

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Originally Posted by shack

Regarding what triggers the fan to run, I think I explained that earlier in this thread.

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Sorry! what I meant was I have no visibility of the pressure switch. No way of testing.