Aircon efficiency

[PENKOP]

Hi I am a new member and the proud owner of a 1992 SFA 2.2 D/C. We have done a fantastic tour through Kaoko land (including Van Zyl's pass) in May 2010. The aircon is not very effective in slow driving and dusty conditions. Any suggestions how to improve or rectify? The aircon was regassed just before we left and apparently this is old technology.
Regards.

[Mud Dog]

Hi Appie and welcome! I moved this topic to 'The workshop" forum since it is more apt here. AFAIK the old flouro-carbon gas was more efficient but I was once told that in order for the A/C to work properly your revs should be at least 2000 rpm.

[CasKru]

What I've seen with mine before is it works very efficient for a long while then it's just as if it does not get any cold air through. If I then switch it of for a while and start it up again, it works like a charm. My conclusion was that it freezes up and then does not alow any air through (not sure if this is what actually happens)

[Mud Dog]

What I've seen with mine before is it works very efficient for a long while then it's just as if it does not get any cold air through. If I then switch it of for a while and start it up again, it works like a charm. My conclusion was that it freezes up and then does not alow any air through (not sure if this is what actually happens)

This is probably exactly what happens, Cassie .... not uncommon.

[PENKOP]

Hi I am a new member and the proud owner of a 1992 SFA 2.2 D/C. We have done a fantastic tour through Kaoko land (including Van Zyl's pass) in May 2010. The aircon is not very effective in slow driving and dusty conditions. Any suggestions how to improve or rectify? The aircon was regassed just before we left and apparently this is old technology.
Regards.

Dankie vir die terugvoer. Jammer dat ek noueers reageer maar ek en die elektronika(Rekenaars) in nognie so in lyn met mekaar nie. Wat van 'n ander kompressor om die probleem te oorkom?

[Mud Dog]

Appie, I think you first need to verify what the problem is specifically. If it's icing up then it's working too well and you might need to turn off the compressor at intervals or have the expansion valve adjusted / replaced. If it's not working well enough it might be loosing gas or the compressor is on it's way out. Either way, it's better to put it in the hands of a reputable professional IMO.

Good luck!

[ChrisF]

Appie welkom by die forum. :)

old vs new - the old R12 and new R134a refrigerants are very close to each other, with the R134a being slightly MORE "efficient".

This is probably more a case of old technology. The new models manage to be very effective, even at idling revs. Older models had to be above 2000 rpm, even closer to high way speed - both in revs AND actual speed. The engine revs was needed for the compressor to pump the refrigerant, and the vehicle speed was needed to help with air flow over the aircon coil.

Then dont forget that aircon is designed for a particular "climate" - most systems are designed to cope with ambient conditions of upto about 35 degrees C, after this point the efficiency DROPS !

Point being, for the 40 + days we have been having one really cant expect too much from these old systems, especially at low speeds

[PENKOP]

Hi Chris,
Thanks for your input. I spoke to a friend of mine who bussiness also cover the installation and servicing of aircons. He sugested to remove the heat exchanger and clean it properly because dust accumelates over time and decrease efficiency. He the changes the fittings on the compressor for regassing with new type (R134a?) and replace the dryer. Additionaly he install an electric fan which swithes on as soon as the compressor draws current. This provides for cooling the condenser during slow driving. This sounds intersting and I plan to do that route and let you know how effective it is.

Appie welkom by die forum. :)

old vs new - the old R12 and new R134a refrigerants are very close to each other, with the R134a being slightly MORE "efficient".

This is probably more a case of old technology. The new models manage to be very effective, even at idling revs. Older models had to be above 2000 rpm, even closer to high way speed - both in revs AND actual speed. The engine revs was needed for the compressor to pump the refrigerant, and the vehicle speed was needed to help with air flow over the aircon coil.

Then dont forget that aircon is designed for a particular "climate" - most systems are designed to cope with ambient conditions of upto about 35 degrees C, after this point the efficiency DROPS !

Point being, for the 40 + days we have been having one really cant expect too much from these old systems, especially at low speeds

[ChrisF]

Appie klink of daai pel van jou weet waarvan hy praat ! :)

Redelike klompie arbeid, so dit kan duur uitwerk .... maar as dit n goeie pel is ... :)

[Gunta]

The fans deffinitely work well. On my 7mge there is no space in the grill for my condensor so I put 2 under the vehicle with fans blowing through them and my aircon is colder than it was before.

[Mud Dog]

Additionaly he install an electric fan which swithes on as soon as the compressor draws current. This provides for cooling the condenser during slow driving. This sounds intersting and I plan to do that route and let you know how effective it is.

As I said, I did this on my previous vehicle and it was so effective I had condensation vapour coming out of the vents.

[Doom]

Hou ons asb op hoogte van sake en kostes daaraan verbonde!

[PENKOP]

Hi Hiluxers,
Net gou terugvoer oor die verandering op die lugversorging. Het dit laas week laat doen (R 1 970 later). Die hitte uitruiler is skoongemaak, 'n elektriese waaier voor die verkoeler, nuwe gas en 'n droër en dit werk baie beter. Nognie getoets tydens stadige rytoestande nie maar in ons 40 grade plus omgewing werk dit heel aanvaarbaar. Wil nog net die waaierspoed ondersoek om meer lugvloei in die kajuit te kry.
Groete

[Gunta]

Has anyone ever tried to change the fan to get more air in the vehicle? I have been thinking about doing the for a long time now?

[Family_Dog]

Mr B did this a while ago, not sure how successful it was but I'm sure he'll throw a word or two this way.


-F_D

[ThysdJ]

Apparently the fan from a Tazz fits on the Hilux mountings, and blows more air. Mr-B and other tried with additional fan blades and stuff, but I dont recall them having a lot of success. :alvarin: :alvarin:

[Gunta]

Has anyone tried the Tazz fan?

[shaunmeizter]

Weet iemand van goeie aircon service en repair in slaapstad omgewing?

[george]

Hi Shaun
Allan gebruik 'n oompie in Stikland.Ek weet nie wat sy nommer is nie.jy sal by Allan moet hoor

[Kat]

Has anyone ever tried to change the fan to get more air in the vehicle? I have been thinking about doing the for a long time now?

Hallo Gunta
Het cressida fan ingesit, blaas bietjie sterker as oorspronklike fan en pas mooi.Fan kom uit Gli 6 cressida met aircon. hoop dit help.

[Gunta]

Eugene, can you feel the difference?