Need To Install a DUAL A/C

[usama1]

AOA PWs

It always come into my mind that there is a dire need of Dual A/Cs in the cars now a days, Although the latest cars are being equipped with every latest Technology but no Pakistan assembled car even TOP OF THE LINE comes with Dual A/Cs, the reason might be the companies think that its a LUXURY(which they think only lies in Power windows and ABS at max), but frankly IMO its Requirement of the time..i even experienced Dual AC in Toyota Cresida 1984 model (Rear AC unit lies at the back dashboard between speakers).Sometimes it becomes very difficult that front passengers get too much cold, whereas rear ones keep sweating.

Nevertheless, I want to know that is there any good mechanic who can convert simple AC into Dual one ? I am particularly talking about civic 95.

It is requested that please do not give the typical public opinion that AC THEEK HO TO KAAM CHAL JATA HAI.

I have talked to the best mechanics of Pindi , Isb like ATHAR CAR AC Islamabad and EASTERN CAR AC Rawalpindi, but none of them could explain me or could gave any satisfactory reply, So far i have not seen any dual AC car(Which has been converted into dual AC).

Anybody who can give his his valuable output, I will be grateful to him and i am sure it will be beneficial for others as well.

Hope to see positive output from cars enthusiastic soon.(H)

Regards,

Usama.

[MKArsalan]

Same question also rise in my mind. best of luck with ur project.

[Xulfiqar]

I have done it, it is possible but you need to make proper shaped linsets to the back and install a block valve and a throttler to control refrigerant flow to the rear evaporator, The compressor should also be heavy duty like a Sanden 7 series at minimum. - It is not cheap or easy, on average with good new and used parts and proper fabrication - expect a cost north of Rs 60,000/- at least - including the control module for the rear unit. (this is on top of your original A/C system)

The rear unit is very expensive to come by and to install the vapor and liquid lines sensibly means that you have to completely rip out the interior of the car, get creative with bending lines and clamping them and ensuring the vapor line sweating does not cause rusting. Then installation of a split manifold and a throttler to control gas flow to both evaporators - these two items are expensive, the split valve alone is about Rs 18,000/- (2006) and is controlled by simple binary 12V signal, the throttler is required to control the flow of refrigerant so the rear expansion valve can actually work - newer climate controlled units had this done by duty cycle within one part, otherwise you might see swinging needles on the pressure gauges and no effeciency. It is also recommended to use an accumulator just in case any liquid comes along from either side..

The rear A/C box installation is not as simple as installing speakers - it requires a major chunk to be cut out from the rear shelf, this then means that you need to remove the torsion bars for the boot lid and install pulling springs like the old Galant or the mercedes W201/124/210. making some drainage holes and also insulating the box.

The rear units you will find in Pakistan are old R12 units from Crowns, Cedrics and Cressidas which stand about 4 inches high from the surface, that means that you will have nearly no visibility at the back. new cars rear screen is very sloped. You can try to rig a rear unit with ductwork into the roof with vents like an aircraft.

But all in all I think modern cars have sufficient blower volume to circulate air nicely in the entire car, just make sure the centre vents point to the roof so air actually pushes to the back of the car.

but if you are determined find an A/C place that services bus and wagon (Hiace) systems. Hiace have dual A/C units.

[levin]

i wont add a rear a/c as an experiment, better to buy a cressida or whatever has rear ac. you will have less problems than standing in heat getting a a/c fixed.

some older Bimmers and Mercs also have rear a/c as standard option and these are avalaible in pk.

why spend 2 million pkr on stock corolla

[uiv]

I've seen 5th gen Civic with rear passenger foot-side air blowers, just like those in 4th gen City, in Bilal Gunj. Those can be source or fabricated for our local cars.
My question is: can't we route air from those ducts and place a couple of air vents at the back side of center console (as seen in some big old cars).
That way, it'd be possible to route all or partial air to the back, or switch it off entirely.

I've always wanted to give it a shot but the problem I see here is that cold air is quite dense and it'd be pretty difficult to get good air throw at those back vents.

BTW, 5th and 6th gen Civic came with center air vent at the top of dashboard - that thing is pretty good at blowing air to the back.

[Xulfiqar]

I've seen 5th gen Civic with rear passenger foot-side air blowers, just like those in 4th gen City, in Bilal Gunj. Those can be source or fabricated for our local cars.
My question is: can't we route air from those ducts and place a couple of air vents at the back side of center console (as seen in some big old cars).
That way, it'd be possible to route all or partial air to the back, or switch it off entirely.

I've always wanted to give it a shot but the problem I see here is that cold air is quite dense and it'd be pretty difficult to get good air throw at those back vents.

BTW, 5th and 6th gen Civic came with center air vent at the top of dashboard - that thing is pretty good at blowing air to the back.

Those little vent blowers were for heating... You cannot add any ducting from the original airbox to the centre console unless you want to design an entirely new console, air flow wont be your problem - you just need to make sure the air volume vs pressure is balanced and you are not compressing the air which can cause it to heat up again.

The centre vent on top of the dashboard was placed for this very purpose, to blow air to the back seats, even if your car does not have that, you can point your centre vents directly to the back slightly tilted upwards so air can hit the rear passengers, You dont need chilled air thrashing your face from the vent. The A/C is supposed to make the interior a nice place not a meat freezer.

The old cressidas, crestas, crowns, cedrics, glorias with dual A/C using R12 could make the car a meat freezer - it would actually start to hurt from the cold..

[ahsanonline]

I've seen 5th gen Civic with rear passenger foot-side air blowers, just like those in 4th gen City, in Bilal Gunj. Those can be source or fabricated for our local cars.
My question is: can't we route air from those ducts and place a couple of air vents at the back side of center console (as seen in some big old cars).
That way, it'd be possible to route all or partial air to the back, or switch it off entirely.

I've always wanted to give it a shot but the problem I see here is that cold air is quite dense and it'd be pretty difficult to get good air throw at those back vents.

BTW, 5th and 6th gen Civic came with center air vent at the top of dashboard - that thing is pretty good at blowing air to the back.

Nice idea for having only air vents extended to the back.
You can use another accessory fan for the purpose and tie it to the main speed setting switches but operated by a relay so that fan speed of both fans remains the same.

OR

If you have the $$$ then import a car marketed for the saudi market

[Xulfiqar]

Nice idea for having only air vents extended to the back.
You can use another accessory fan for the purpose and tie it to the main speed setting switches but operated by a relay so that fan speed of both fans remains the same.

OR

If you have the $$$ then import a car marketed for the saudi market

If you add a fan to the air exit path it may heat up the air as it gets compressed, I know you wont be using a high volume low speed fan because those fans would take up the entire front passenger seat. Or you might get a little creative and squeeze a squirrel cage in there.

speaking of saudi market cars, only american cars have an upgraded A/C for that market, if you pick a mercedes benz it will have the same silly weak A/C as they give to the rest of the world.

[uiv]

If you add a fan to the air exit path it may heat up the air as it gets compressed

... add an inter-cooler

[usama1]

@MKArsalan
Thank you very much...

@Xulfiqar

Thank you for your valuable information..i think it needs extreme technical skill to successfully install a dual AC and its Expensive too...I talked to MARKS and MINGS guys ( Who make fiber bodies for pick ups ), they also convert single cabin into double cabin by the way, they also install separate AC unit in rear compartment and they were giving me the estimate of Rs.35000/-, but i think that 35k on Dual Ac is not worth spending..I have reached the result that one must go for genuine Dual Ac vehicle..

I really appreciate your comprehensive understanding of the system and best part is that you made it understandable as well.

Thanks once again,

Best regards,

Usama.

[SLK230]

help needed xulfi bhai....??? have inboxed u...

[SLK230]

can u help me with my prob xulfi bhai >>????

[SLK230]

hellooo sir ????

[rushlord]

Very comprehensive reply, I learnt a lot from it
Thankyou

[asjad.iqbal2008]

Have u gone through the mod ????

[usama1]

No bro