iNfAmOuS_E46

ok guys I had my local mechanic do the work and it cools ok but im getting this whistling behind the glove box now and the compressor shuts on and off rapidly....what could it be ???

also he flushed everything before installing the new stuff and charged and vacuumed the system manually could that be the issue ?? maybe there is air in the system ?

I will take it to my friends shop tomorrow that has an a/c machine and pull a complete evac on it and recharge with r134 and pag 100

any tips ???

iNfAmOuS_E46

I also noticed when I drove the car home the lighted ac button and or ac turned off all on its own

Former User

Car?

When the system rapidly cycles, does the A/C button light turn on and off?

iNfAmOuS_E46

1999 civic dx

the last few times it didn't turn completely off but whne I first drove it home it did it once that I noticed I didn't want to leave it on if there is a problem

tomorrow morning I will be hooking it up to a robinair cooltech machine and doing a full recovery and refill any tips ????

what specs should I enter into the machine ??? weights and pressures ? car on and off when doing what ????

iNfAmOuS_E46

any help is appreciated thanks in advance ...it is hot as heck here in the 92244

Former User

It could be an electrical problem, for example a bad heater control panel.

iNfAmOuS_E46

I mean it had never done the whistling ever before or the shutting off on its own

Former User

The A/C button light turning off on its own is the sign of an electrical problem.

iNfAmOuS_E46

dang it ill see if it happens again

slowcivic2k

Does the whistle appear as the system turns on, and off? In almost all cases, a low refrigerant level will produce this symptom. When the refrigerant gets too low, it boils instantly (flashes) through the expansion valve, producing a noise that can be very audible.

This can also be caused by an expansion valve that is choked on one side, producing a whistling effect.

PAG100 is not the correct oil, PAG46 is. Not many vehicles use 100, only 150 (GM mostly) and 46 (everyone else). SP-10 and ND-8 oils can use PAG46 without any problems.

I don't have the A/C button schematic for your car handy at the moment. That needs to be referenced for the electrical portion.

iNfAmOuS_E46

Would you guys happen to know where the door/flap is that mixes the air ?

zc_mike

Underneath the windshield wiper cowl, passenger side..

That's how it is in the 92-95 anyways..

tony_2018

System could be overcharged. Can you rent a gauge and confirm pressure before vacuuming?

edit: I actually redid my ac system as well, new seals, clean lines and fresh oil and new compressor, new expansion valve. No whistling here.

Former User

iNfAmOuS_E46

Hey guys we ended up hooking it up to the rrr machine and recovery,vacuum,oilcharge, and r134 charge and i must say it blows pretty darn cold and no more whistling

slowcivic2k

Testing the button to isolate the random turning on and off would be quite simple, but I don't believe that is your problem. It would have to be in the heater control panel, the 5V rail that the A/C switch uses would have to be sensed on somehow, and that part (wherever that is, it isn't shown) has failed. Replace the panel if the button tests okay.

iNfAmOuS_E46

now im having an issue where if its cloudy out its cool at night its cool but driving to work mid day 100-105 degrees outside the air coming out is moderately cool at best (only on the freeway ) and me and my car pool buddies are sweating in town before we hit the freeway

iNfAmOuS_E46

I know when I did the complete evac and recovery I only put 1.5oz of pag oil and 21oz of r134 back in what should I be putting back in if I redo it ?

Former User

Does the A/C button light remain on or turn off on it's own occasionally as you mentioned earlier in the thread?

iNfAmOuS_E46

not again im thinking maybe I turned it off due to the clutch cyling on and off quickly when I first got the car back before I redid the r134 and oil

Former User

If the A/C worked fine after the recharge and recently the performance declined, then perhaps there's a refrigerant leak.

iNfAmOuS_E46

we did the recharge at 8-9am it was a decent day not too hot it was blowing cool at idle nothing crazy like my g8

also the machine we use does pressure and leak tests I wonder f I should add another oz of r134 to put it at max factory capacity

Former User

Use the machine to performance test the system as per the service manual instructions.

iNfAmOuS_E46

the robinair machine manual or the civic service manual

Former User