Car AC Diagnosis of Various Symptoms Dedicated Thread

[afnan.bashir]

Hmm Sahi.
Kindly santro AC system ke kuch specs bta dejye.

-Compressor Oil ??
-How much oil to add in condenser and filter bottle and evap. replacement. ??

I doubt this much info will be available. If it takes same gas it should take same oil

[afnan.bashir]

Whats your plan? waiting for you else ill return the weighing scale.
@xulfiqar well ac is working fine but at times i feel it intermittently puts load on engine mostly it will engage when car is cold (as rpms are high) but otherwise at idle when ac kicks in rpm raises a bit and it puts load that they drop and tick tick continues until i press throttle and let it engage it. Do i need to reduce gas or their is moisture ?

@xulfiqar and at ambient of some 35 deg I get went temp to b 10 deg what should it b?

[wasim625]

the vent temp. Is acceptible if it is close to one third of ambient temp. in ur case anything near 10 - 12 is good (y)
Question: how can your system be overcharged if you are charging it by weight already?

[afnan.bashir]

the vent temp. Is acceptible if it is close to one third of ambient temp. in ur case anything near 10 - 12 is good (y)
Question: how can your system be overcharged if you are charging it by weight already?

Well there is a range for gas 500 to 550 grams. not sure what it is may be due to moisture it is sticky txv

[wasim625]

@xulfiqar
Well few days ago i talked about my window AC here and today its gas got leaked haha, well i am thinking to get it repaired. Can we flush it with ctc and nitrogen and then charge r12 by weight? Like we do in cars? Asking since it has a piston compressor unlike rotary ones we have in cars so may be there is a different/better way of servicing it.

[ahmed2396]

38C ambient 55psi low side 300psi high side and 13C at vents is this good? I suppose the condenser is not doing job properly its and old serpentine one.

[wasim625]

38C ambient 55psi low side 300psi high side and 13C at vents is this good? I suppose the condenser is not doing job properly its and old serpentine one.

Well it should be around >55 psi low side and 315-325 psi high side with that ambient temp. High side being low than the specs I suspect a faulty compressor but experts will have a final saying on it.
The vent temp is OK

[afnan.bashir]

38C ambient 55psi low side 300psi high side and 13C at vents is this good? I suppose the condenser is not doing job properly its and old serpentine one.

To e they sound good because humidity takes hold here. You can suspect condenser if your car is does not cools on idle but cools when it is in motion

To replicate that get readings on idle then put a fan in front of car and see the diff

[obsolete]

Assalamo a laikum @xulfiqar

Kindly give me your contact number .... i need to install a split ac in a day or two and i need some quick info regarding vacumming the lines before installation.... i tried to private msg you but ur inbox if full and cant no more msgs (be easy on it bro ) ....

thanks and regards

Omer
0320-8001308

[unstopabl3]

To e they sound good because humidity takes hold here. You can suspect condenser if your car is does not cools on idle but cools when it is in motion

To replicate that get readings on idle then put a fan in front of car and see the diff

Can you plz recommend a good car AC shop in Lahore? Need to get my Mehran car AC serviced/repaired into working condition.

[unstopabl3]

There is a huge issue of gas here - when you fill R134 in an R12 system you need approximately 80% weight only and even then the performance is not anywhere equal to the original system.

The only way you get good performance is to replace the condenser with a very good parallel flow unit - R134 is a very stubborn refrigerant and does not take change in temperature as easily as R12 does.

So in Mehran with Mini Pajero AC fitting, R12 should be used right?

[afnan.bashir]

Can you plz recommend a good car AC shop in Lahore? Need to get my Mehran car AC serviced/repaired into working condition.

Bhatti car ac shade wal choek

[obsolete]

Anyone has zulfiqar's number ?

[SER_GTR]

Assalamo a laikum @xulfiqar

Kindly give me your contact number .... i need to install a split ac in a day or two and i need some quick info regarding vacumming the lines before installation.... i tried to private msg you but ur inbox if full and cant no more msgs (be easy on it bro ) ....

thanks and regards

Omer
0320-8001308

What Kind Of Info You Need..You Can Post And Ask Here....Xulfi Bhai And Many Others Including Me Sometimes Don't Have Time To Check It For Like Many Days So Posting Can Help You As Someone Else From Here Will Guide You...

[obsolete]

Its in thr post.... i need to install a split acm.. i read u shud vaccum the lines before instaling.... never done thay before. So nees a bit of info and help. ... ill do it myself...

[SER_GTR]

Yes The proper Procedure Of Installing SPLIT UNIT Requires You To Vacuum Lines...

Installation Goes Like.....Inner Install....Prepare Line-set....Flare Line-set...Outer Install.....Connect Lineset....Connect Control Wire....

Keep Lenth Of Lineset In Mind....If You Install Longer Lines....

Now There's Another Step Which Is To Install Manifold Gauge And Connect It With Nitrogen Cylinder...Pressurize System Upto 150Psi And Check For leaks...Water SOAP Mixtures Works Good To Detect Any Leak From Joint...Hold It For 10min...If No Pressure Drop LEAK FoUND.....Disconnect The Nitrogen Cylinder And Install Vacuum PUMP And Evacuate System(Vacuum System) Do It For Good 30min Then Lock Down Your Manifold Gauge And Disconnect Vacuum Pump...Hold Vacuum For 10 Min To Make Sure There's No Drop In Vacuum.... You Are DOne Vacuuming

Now If Your Lineset Comes With UNIT And Is Under Standard Length As Factory Recommends In Manual....You Don't Need Additional Gas Charge..For Longer Lineset You Can Read Manual To Charge Gas /FT Additional Lineset Length

If There's No Additional Charge Required...Open Your Service Valve Slowly One By One ...You Need Specific Size L-Key To Do That...

After Doing It ...Start Your Unit And Let It Run For 10min....Measure Readings..And If You Wanna Go One Step Ahead And Double Check For System Performance.....You Need To Measure Superheat Of System( You Can Google How To Do That..Its A Good Long Procedure) Else Disconnect Your Gauges And Tighten All Service Port And Service Valve Caps With Spanner..

If You Need Additional Ref Charge .....Connect Your Manifold Gauge With Charging Cylinder Purge The Line SO No Air Gets In....And Charge Additional Gas Later Measuring On Weight Scale..(In Manual Its Written & You Need To Charge By Weight)

[SER_GTR]

Mention Somethings

You Always Connect Low Side Port (Big Fat Line) And Always Vacuum/Charge By IT....There Will Be Possibly No HIGH Side Charging Port Available...So Its Not To Be Used

If There;s No Nitrogen Available...You Can Vacuum It Directly For Good Atleast 30min(Depends On Length Of Lineset..) If Its longer...Do It For 1 Hour....

A Compressor Made VACUUM PUMP Job Will Not Bring Good Results As A proper Single STAGE Or DOUBLE Stage 3-5CFM Vacuum Pump Will....! So Its Recommended To Use Only Proper Vacuum Pump...Not Any DESI Made....! It Can Contaminate Your System On Deep Vacuum Creating More Issues

While Charging...Always Take Care And Wear Safety Glasses....Refrigerants Are Not EYES Friendly....So Always Take Care...!

Don't Charge By Putting Cylinder Upside DOWN In R22/R134a....R410A Needs To Be Charged This Way Only ...Let System Suck It Slowly....If Its Too Hard To Charge....You Can Put Charging Container In Warm Water Bowel .....

Always Make Sure You Charge As per Weight If You Know Required Quanity...Its Always Mention On System....! For That You Def Need A Weight Scale To Measure Quantity.... +/- 10gm-20gm Is Not Issue But Nothing Above This....

[obsolete]

Ok i kind of understand the procudure.... but im not so cool with the technical terms..... high side low side.... i needed a 5 min walkthru on call so i know what am i doing

[wasim625]

@ser_gtr best explanation i have read on Pakwheels.

[wasim625]

Ok i kind of understand the procudure.... but im not so cool with the technical terms..... high side low side.... i needed a 5 min walkthru on call so i know what am i doing

He just spoon fed you every little detail there is - required in this job.