Car AC Diagnosis of Various Symptoms Dedicated Thread

[Xulfiqar]

if the system has moisture the txv can ice itself up closing itself

That is a very ugly situation.

[afnan.bashir]

afnan, your txv is sticking or there is a restriction within the evaporator coil if your condenser is new, for flushing I first use a standard solvent like petrol or white spirits and then finish off with acetone (lots of it). While using the petroleum solvents its best to fill up and use air pressure to make a hammer effect inside.

Please note only pipes can be cleaned this way not the coils - multipass coils are best renewed as the orifices are tiny. Also note that if your suction line has a manifold on it then renew that line, the manifold piece cannot be cleaned out.

now back to your issue, you mention that someone has patched the liquid line to repair something, I hope that the line has not been compromised internally - you will feel it mostly as a drop in temperature after the restriction.

Well i am going to change the evaporator unit because this is the only thing that was not changed. What is meant by manifold on suction side?

I will re-do those patches and but as far my experience is there is no temperature difference there.

[afnan.bashir]

That is a very ugly situation.

My mechanic was doing ustadee and told me that as you have changed the txv you need to re adjust it from that screw. now i am confused that denso made these txv why would i mess with it. I did not got HONDA txv as they are not available. If adjustment is requided i have to go to junkyard and there is a car half cut sitting with cooling coil . i can get that in 2k coil and txv.

But i have heard that cooling coils left alone for long are not good

[Xulfiqar]

if the coil has been subjected to dirt ingress the coil is junk as it cannot be washed out, The TXV is junk anyway.

How cold is the vapour line from the evaporator?

[Xulfiqar]

Well i am going to change the evaporator unit because this is the only thing that was not changed. What is meant by manifold on suction side?

I will re-do those patches and but as far my experience is there is no temperature difference there.

manifold on suction side means that there is a small cylinder in the suction line, usually very near to the compressor. It almost looks like a shortcut approach to a 90 degree angle fitting.

That manifold acts like a reserve and has a coarse filter in it, it cannot be cleaned out.

[afnan.bashir]

if the coil has been subjected to dirt ingress the coil is junk as it cannot be washed out, The TXV is junk anyway.

How cold is the vapour line from the evaporator?

After adding extra gas it is pretty cold at higher RPMs that in engine compartment water falls off the pipe. At idle its just warm.
sorry for not providing temp reading because I don't have temp sensor rite now
1. Should i go for different compressor this one is of CRV by kinhin something but all accords i have see have denso compressor.
2. I used new TXV i can still add new TXV but do we need to adjust it ?
3. There is noting like manifold that near compressor
4. If new condenser is filled with grey liquid oil should i just wash it? or i have to replace it?

[margallar]

manifold on suction side means that there is a small cylinder in the suction line, usually very near to the compressor. It almost looks like a shortcut approach to a 90 degree angle fitting.

That manifold acts like a reserve and has a coarse filter in it, it cannot be cleaned out.

i think i see this cylindrical thing on our old national fridges

[syncview]

After adding extra gas it is pretty cold at higher RPMs that in engine compartment water falls off the pipe. At idle its just warm.
sorry for not providing temp reading because I don't have temp sensor rite now
1. Should i go for different compressor this one is of CRV by kinhin something but all accords i have see have denso compressor.
2. I used new TXV i can still add new TXV but do we need to adjust it ?
3. There is noting like manifold that near compressor
4. If new condenser is filled with grey liquid oil should i just wash it? or i have to replace it?

leave everything as it is right now
discharge the system
remove evaporator and txv and air flush the txv out
add about 5cc of oil to the evaporator
fit everything back
give it a good vacuum for at least an hour
recharge and test

[afnan.bashir]

leave everything as it is right now
discharge the system
remove evaporator and txv and air flush the txv out
add about 5cc of oil to the evaporator
fit everything back
give it a good vacuum for at least an hour
recharge and test

Do you have proper pump for vac. Every one uses small fridge compressor

[Xulfiqar]

After adding extra gas it is pretty cold at higher RPMs that in engine compartment water falls off the pipe. At idle its just warm.
sorry for not providing temp reading because I don't have temp sensor rite now
1. Should i go for different compressor this one is of CRV by kinhin something but all accords i have see have denso compressor.
2. I used new TXV i can still add new TXV but do we need to adjust it ?
3. There is noting like manifold that near compressor
4. If new condenser is filled with grey liquid oil should i just wash it? or i have to replace it?

This is alarming, what is this gray liquid?

[SER_GTR]

This is alarming, what is this gray liquid?

Compressor OIL ...

Abt That Manifold So Have Seen It In Couple Of Cars Including NEw Corolla....It Looks Like A Swollen Line rying To Brust From That Part...Or Like A Big Cyst On Line !!

20v OEM Lines Also Have It.....What Purpose It Serve??

[SER_GTR]

Do you have proper pump for vac. Every one uses small fridge compressor

Find Some Commercial AC Installer..They Usually Have That Vacuum Pumps....Fridge Wala Compressor Won't Work GOOD ...!

[HellsGuardian]

car in question is civic 2005, all stock. no work has been done on compressor so far. Full AC service done as well recently (changed dryer too)
The cooling is great at all times but randomly a sound comes from AC area when the car is idling. It comes only when AC is turned on, when it trips off, the sound goes away. The sound feels like as if some metal parts are loose and hitting each other. The mechanic said it might be clutch but if cooling is fine then np. He also said that its not the pulley/belt/bearing because the sound comes only when AC turns ON. Sometimes the sound goes away on its own and it comes back on when AC trips to ON in idle.

Should i further investigate and try to find a solution? or let the compressor live through its last part of life as is?
If former is the case, what am i supposed to do? mechanic already gave his remakes

[Xulfiqar]

Compressor OIL ...

Abt That Manifold So Have Seen It In Couple Of Cars Including NEw Corolla....It Looks Like A Swollen Line rying To Brust From That Part...Or Like A Big Cyst On Line !!

20v OEM Lines Also Have It.....What Purpose It Serve??

small reserve in the line, quietens down the pumping and also smooths out the flow into the compressor.

btw - grey oil is deadly, its probably metal bits - this will either plug the drier's filter or machine the compressor so its just a show piece.

[afnan.bashir]

This is alarming, what is this gray liquid?

Well sight glass is dark and I expect black or grey liquid there. I just drained compressor oil and placed new oil. And later I thought I had to fill and drain oil once to avoid mixture of two oil types. I saw a very good condition denso compressor I think I will also replace compressor because of doubts.

[afnan.bashir]

small reserve in the line, quietens down the pumping and also smooths out the flow into the compressor.

btw - grey oil is deadly, its probably metal bits - this will either plug the drier's filter or machine the compressor so its just a show piece.

I suspect it to be there. I will open tomorrow and update details . I got evaporation along with txv. I spent 1 hour wating for guy to open it from half cut in market. On opening it was very very clean inside transparent oil flows.

Please point the error or modification in my procedure.

Thing is i could have spent time figuring and changing single part but i have some guests coming up and they will be using my car. that is why changing it for peace of mind

Flushing evap and Condenser and lines
1. Get Petrol Fill them.
2. Let it sit there for some time Blow with compressed air
3. Repeat it twice.
4. Will try to see if that AC guy has fittings and i fill it with air or nitrogen along wtith petrol. For hammering effect.

Flushing the Compressor
This i dont think is necessary as i have seen a very good compressor tied to engine and i am sure it is not repaired. Its pipes are sealed so that no dirt gets in or out.

1. Extract all oil in there and measure how much came out
2. Fill it with ND-8 oil
3. Spin it for some time and then again remove the oil.
4. Repeat it twice

Fill everything according to specs and get good vaccum and then refil according to weight

Suggestions required @Xulfiqar @SER_GTR @syncview @capsat

Following shows the picture of the new TXV from the coil i obtain. One can observe the rusted bolts. As I dont consider them problem. If this was not mounted then i would think this is bad coil. All pipes were connected to both connections. The black you see are pipe scratches not dirt

[formanite786]

Heyy ..respected fellows Zulfiqar, capsat ..need to discuss my Cuore AC and heating problem but cannot post In my own thread....how to approach u....my user name is my Id on gmail.....plz email me ,I will send u my queries there....I will be obliged if u help me out......thanks

[chinyoti]

Has anyone had issues with a 10th Gen Corolla A/C compressor? The so called sensor wala compressor?

I remember i used to visit ac mechanics taking cars for ac repairs or ac service, and every other ac wala complaining that the 10th GEN Corolla compressor fails very often because it a sensor wala ac.

I got my Corollas ac condensor replaced around 6-8 months back, and then again 6 months back because the new one leaked aswell. Now my Corolla is also giving this issue that the compressor turns on and off by its will.

I havnt yet got the car checked by anyone but by taking to ac mechanics i feel the compressor needs to be replaced.

the options i have,

1) Change to 9th GEN Corollas Kabuli compressor/Condensor (21-25k expence including labour and the entire job)
2) Replace current compressor is around 32k (No warranty).
3) Toyota dealerships have compressor only for 45k

Any suggestions? Is the current compressor that comes with 10th GEN Corolla repairable.

[wasim625]

Has anyone had issues with a 10th Gen Corolla A/C compressor? The so called sensor wala compressor?

I remember i used to visit ac mechanics taking cars for ac repairs or ac service, and every other ac wala complaining that the 10th GEN Corolla compressor fails very often because it a sensor wala ac.

I got my Corollas ac condensor replaced around 6-8 months back, and then again 6 months back because the new one leaked aswell. Now my Corolla is also giving this issue that the compressor turns on and off by its will.

I havnt yet got the car checked by anyone but by taking to ac mechanics i feel the compressor needs to be replaced.

the options i have,

1) Change to 9th GEN Corollas Kabuli compressor/Condensor (21-25k expence including labour and the entire job)
2) Replace current compressor is around 32k (No warranty).
3) Toyota dealerships have compressor only for 45k

Any suggestions? Is the current compressor that comes with 10th GEN Corolla repairable.

Didnt you try to find out why the condenser leaking again n again?

Before crediting that much expense from your pocket and throwing parts at your ride worth thousands of rupees just on a 'hope' they will work, did your AC tech tested the compressor? What are the referigrant gas pressure readings in the system? Is the belt properly tighten? Is AC Clutch gap clearance according to the spec? Any electrical problems with clutch? Bad Relays? Bad wires?
Rule out these possibilities i don't think you ll have to replace compressor.

[chinyoti]

Didnt you try to find out why the condenser leaking again n again?

Before crediting that much expense from your pocket and throwing parts at your ride worth thousands of rupees just on a 'hope' they will work, did your AC tech tested the compressor? What are the referigrant gas pressure readings in the system? Is the belt properly tighten? Is AC Clutch gap clearance according to the spec? Any electrical problems with clutch? Bad Relays? Bad wires?
Rule out these possibilities i don't think you ll have to replace compressor.

Condensor obviously had visible leakage on its fin thats y replaced it. 2nd was replaced under warranty because it was a faulty part leaked under 2 months.

After that the compressor started acting. And I think it's a clutchless compressor I.e sensor wala compressor