AC Issues

[CoolSwitch]

Mga sir, ask ko lang ano possible cause bakit hindi lumalamig hangin ng AC ko.

Here's what happened:

Car: Nissan Maxima 89

Engine got recently replaced, then nagpa karga ako ng Freon, nag leak check naman yung nagkarga along the engine bay. So after ng karga, mukha naman ok, kasi umuwi ako ng malamig ang AC, and ramdam mo dun sa copper tubes yung lamig...

After a few days, punta kami hospital, doon ko naramdaman na di lumalamig ac, kapag naka_on naman gumagana condenser and you can also hear na nagbago menor.

I already tried all level settings, made sure na nasa cool yung isang switch, and AC button is pressed. kaso wala talaga.

Then tiningnan ko at sa engine bay yung device na may glass sa ibabaw, meron naman laman kasi may parang usok na gumagalaw, tried na pasingawin sa gas valve, meron naman,

pero funny thing is, nung hawakan ko yung copper tubes ng AC, walang lamig, kahit dun sa tube sa dalawang side nung part na may glass sa ibabaw


ano kaya problema?

[jick.cejoco]

Mga sir, ask ko lang ano possible cause bakit hindi lumalamig hangin ng AC ko.

Here's what happened:

Car: Nissan Maxima 89

Engine got recently replaced, then nagpa karga ako ng Freon, nag leak check naman yung nagkarga along the engine bay. So after ng karga, mukha naman ok, kasi umuwi ako ng malamig ang AC, and ramdam mo dun sa copper tubes yung lamig...

After a few days, punta kami hospital, doon ko naramdaman na di lumalamig ac, kapag naka_on naman gumagana condenser and you can also hear na nagbago menor.

I already tried all level settings, made sure na nasa cool yung isang switch, and AC button is pressed. kaso wala talaga.

Then tiningnan ko at sa engine bay yung device na may glass sa ibabaw, meron naman laman kasi may parang usok na gumagalaw, tried na pasingawin sa gas valve, meron naman,

pero funny thing is, nung hawakan ko yung copper tubes ng AC, walang lamig, kahit dun sa tube sa dalawang side nung part na may glass sa ibabaw


ano kaya problema?

if the a/c system had been left open during the engine replacement, you should have had the system serviced too. that is, evacuate, replace receiver/dryer, replace all o-rings, replace expansion valve and had the system vacuumed for at least 20 minutes under 29 inHg and verified it it held the vacuum for at least ten minutes after vacuum pump shut down. then recharge with new or reputable recycled refrigerant for trouble free system for at least three years

[CoolSwitch]

if the a/c system had been left open during the engine replacement, you should have had the system serviced too. that is, evacuate, replace receiver/dryer, replace all o-rings, replace expansion valve and had the system vacuumed for at least 20 minutes under 29 inHg and verified it it held the vacuum for at least ten minutes after vacuum pump shut down. then recharge with new or reputable recycled refrigerant for trouble free system for at least three years

eto ba yung process na ibababa yung evaporator? may sinasabi din kasi yung AC tech dun sa shop na AC Cleaning, php900.00 yung price nung service including na yung re-charge?

What do you mean the ac system left open during engine replacement?

TIA ulit

[weisshorn]

eto ba yung process na ibababa yung evaporator? may sinasabi din kasi yung AC tech dun sa shop na AC Cleaning, php900.00 yung price nung service including na yung re-charge?

What do you mean the ac system left open during engine replacement?

TIA ulit

Yes, ibaba yung evaporator for cleaning. Kasama na rin ang evacuation, recharge and leak test ng system. Not necessarily na palitan lahat ang mga items na sinabi ni Jick kung ayon sa service tech ay ok pa for further service.

Ibig sabihin ni Jick disconnected ang tubes ng aircon at naiwan na open to the atmosphere noong nag changed engine ka. In this condition ang atmospheric pressure ay papasok sa loob, ang hangin na pumasok ay may kasamang moisture na magiging tubig at sasama sa circulation ng refrigerant.Ang moisture (tubig) ay nr. 1 na kalaban ng ating refrigeration & airconditioning system.

[CoolSwitch]

THanks...

Btw, can anyone help me verify what type of refrigerant an 89 maxima should use?

Is R12 different from 134a? Though I am not sure if the maxima indeed is suppose to use R12, I believe I told the AC tech to put 134a. What happens if I use the wrong type of refrigerant?

AC mech seems to be all working...

And I may have been the cause of the problem after all...

TIA

[weisshorn]

I believe R12 ang refrigerant used in that year model (I might be wrong though).

Magkaiba ang R12 sa 134a refrigerant. Mas mataas ang pressure ng 134a. Hindi lalamig ng maayos ang hangin ng A/C system. Possible na puputok ang seal ng compressor kung ang system ay R12 dati.

The least na modification para lumamig muli ang hangin ay palitan ng expansion valve with the same capacity as before but for 134a system.

[CoolSwitch]

I believe R12 ang refrigerant used in that year model (I might be wrong though).

Magkaiba ang R12 sa 134a refrigerant. Mas mataas ang pressure ng 134a. Hindi lalamig ng maayos ang hangin ng A/C system. Possible na puputok ang seal ng compressor kung ang system ay R12 dati.

The least na modification para lumamig muli ang hangin ay palitan ng expansion valve with the same capacity as before but for 134a system.

baka kaya ayaw lumamig.. kasi ersop ang nasa isip ko that time, eh 134a ang gamit ko sa mga pistol ko.. ayun ang unang pumasok sa isip ko at sinabi dun sa mag-charge

sana ok, looks ok pa naman, pwede ko ba pa-flush out yung 134a then pa-charge ko ulit with R12

[weisshorn]

Yes flush & evacuate the system, recharge with R12 to full capacity then it should be ok.
The same problem lang ito pag R12 system kinargahan ng R22. Ang lamig ay hilaw kasi hindi maabot ang full charge condition kasi mataas na ang pressure ng system pero ang volume ng refrigerant sa loob ay kunti.

[CivicVTi]

Hindi ba naninita ang LTO pag magrehistro ng kotse at R12 ang refrigerant? AFAIK kaya konti na lang ang gumagamit ng R12 kasi hindi sya ozone friendly at banned na sya ng LTO?

[weisshorn]

Yikes! double post..sorry.

Hindi ba naninita ang LTO pag magrehistro ng kotse at R12 ang refrigerant? AFAIK kaya konti na lang ang gumagamit ng R12 kasi hindi sya ozone friendly at banned na sya ng LTO?

No problem basta non-appearance ang pag register. Kailangan completo papers especially ang emission test result. At least ganito ang gawa ko before I sent to junk yard ang 79 toyota corona ko. ( bigla ko tuloy na miss my old, old car sa tagal ng pinagsamahan namin )