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  #37  
Old 08-09-2012, 05:54 AM
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Re: Harmonic noise coming from engine...

My system was evacuated and regased. It did not fix the noise. That's why they now say tx valve. However I am very nervous now knowing what you's have said about it needing stripping back to firewall.

I am taking it back to the dealer I bought it from on Monday for second opinion.
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  #38  
Old 08-09-2012, 06:26 AM
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Re: Harmonic noise coming from engine...

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Originally Posted by Sean View Post
My system was evacuated and regased. It did not fix the noise. That's why they now say tx valve. However I am very nervous now knowing what you's have said about it needing stripping back to firewall.

I am taking it back to the dealer I bought it from on Monday for second opinion.
Could be completely off the mark here, but if they reclaimed the refridgerant from your system, vacuumed the lines then put the exact same product they took out back in, yours might also be overfilled. I say this because mine is much much worse now more refrigerant has been added.
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  #39  
Old 08-10-2012, 02:25 AM
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Re: Harmonic noise coming from engine...

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Originally Posted by captainjunket View Post
Sounds like the AC compressor is slugging liquid refrigerant at cut in. A common problem in conventioal refrigeration and air conditioning systems. what actualy happens is one of two things the TX valve is over feeding in the on cycle and when the temperture is reached the compressor cuts out, the over feed refrigerant lays in the suction line in a liquid state and when the compressor cuts back in the compressor slugs liquid refrigerant. Not ideal as this will reduce the life expectancy of the compressor. Without getting to technical ask an auto AC specialist what the superheat should be.
OK, took the car in today to a reputable AC company HIGHLY recomended by the guy thats serviced the families cars for years. My Jeep looked like it was in intensive care with every gauge, voltmeter, wires, plugs, canisters, three guys in it and on it etc...etc.... The AC was reset from scratch using the "superheat calculation" method....no idea what that means. Over time, the noise subsided as they adjusted qty of refridge until now when it cannot be replicated. I'm holding my breath and have every thing crossed including parts of my body not designed to be crossed but all is silent!! Furthermore (AllyPally you picked up on this early doors) they reckon it appears a saddle clamp might me amiss inside the car to take care of any "normal" vibration. Like I say, I'm holding my breath and will keep you updated over the weekend. Cars had a good sprint across the city and its not making any noise when it would normally. And its freakin freezing set a LO. CaptainJunket, many thanks Mate for taking the interest and prompting me to get a second opinion. It was a bit exxy but could be money well spent. As they mentioned today, overfiling the system WILL damage the TXV and this goes on my report. They also mentioned you cannot just add the weight of refridge according to the sticker on the front, you would go say 400g, monitor it under test, add a bit more until cooling etc is stable. You know more about this than me. Off to get incredibly drunk. Cheers Fellas.
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  #40  
Old 08-10-2012, 02:38 AM
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Re: Harmonic noise coming from engine...

That's great news.. Everything. Crossed for you...

Can you please pm the contact and rough cost. Much appreciated.

Sean
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  #41  
Old 08-10-2012, 04:15 AM
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Re: Harmonic noise coming from engine...

I would send the bill to your dealer and tell them to pay for it. They had enough tries, you are well within your right to make the pay for it. It is good news that it has been sorted out by someone with a clue.
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  #42  
Old 08-10-2012, 04:33 AM
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Re: Harmonic noise coming from engine...

Good news Glenn.

Exactly as Enforcer suggests, you should know send the bill along with a letter of demand to the dealer. It would seem at the end of the day that it was their incompetence and inability to perform a diagnosis that they couldnt fix this.

To CaptainJunket ... Mate, very well done. Kudos to you.
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  #43  
Old 08-11-2012, 12:55 AM
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Re: Harmonic noise coming from engine...

That's great Glenn, I bet you have a grin from ear to ear
It just goes to show how lack of training and experiance is on auto AC at the dealers. One wonders when something else goes haywire say auto tranny should we trust the dealers, and go yo an auto tranny specialist.
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  #44  
Old 08-11-2012, 06:12 PM
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Re: Harmonic noise coming from engine...

Marvelous, the noise is back.......however very infrequently but what I think is more important, it only makes the noise when engines hot and car is stopped - not all the time, only after a minute or so and only now and again). Under the bonnet is really hot so there's an obvious build up of latent heat when stopped that could be contributing to the problem where as when moving, airflow temperature (take yesterday for example) was around 23 degrees. I suppose my question is if it is the TXV why does it not make a noise when moving, only when stationary, and why is the problem not as bad now the refridgerant levels have been changed? I'll ask Freezetec tomorrow and see what he says. (Just for the record I set my AC to a cold LO whilst moving to make sure the compressor was kicking in - It only happens when stopped)
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  #45  
Old 08-11-2012, 06:47 PM
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Re: Harmonic noise coming from engine...

Get Freezetec to check superheat whilst it is cycling. if ithey find the superheat too low see if they can adjust TX valve. Iam not sure weather the TX valve has an external adjustment or not.(may be internal) All commercial ones do. basiclly you have to have a stable superheat say around 6 to 9 degC at all conditions. when the car is stopped you are relieing on the electic radiator fan to give all your cooling thru the condenser, so what happens the discharge pressure increases the flow of refrigerant thru the TX valve and evaporator and if the weight of the refrigerant charge is correct the TX valves job is to modulate closed as to NOT slug refrigerant to the compressor.
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Old 08-11-2012, 11:29 PM
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Re: Harmonic noise coming from engine...

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Originally Posted by captainjunket View Post
Get Freezetec to check superheat whilst it is cycling. if ithey find the superheat too low see if they can adjust TX valve. Iam not sure weather the TX valve has an external adjustment or not.(may be internal) All commercial ones do. basiclly you have to have a stable superheat say around 6 to 9 degC at all conditions. when the car is stopped you are relieing on the electic radiator fan to give all your cooling thru the condenser, so what happens the discharge pressure increases the flow of refrigerant thru the TX valve and evaporator and if the weight of the refrigerant charge is correct the TX valves job is to modulate closed as to NOT slug refrigerant to the compressor.
Say the noise is the compressor getting slugged with refridg, could it be a fauly TX afterall? With the time spent on it last Friday, they were very happy with the results...no noise, no noise at all when driving Friday but yesterday (only a couple of times) did I get the trombone solo!! (Only when stopped for five minutes or so with the engine running. I'm told the TXV is buried in the dash, but I'd be suprised if is only a matter of removing the centre console, radio etc to get to it. Wish I could talk to somebody in the factory in the US for a bit of piece of mind. Dreading the dash coming out after seeing a brand new red CRD Ltd get abused and butchered last week by the same techy.

Edit: - Also the compressor runs for a few seconds (maybe 10 secs) then stops. Then the condensor fan runs for a few seconds (maybe 10 secs) and stops, this cycle repeating itself. Never do the two devices run at the same time. Is this normal? Could the condensor be an issue or some temperature diff monitoring device? Would this have been picked up off the gauges. (Pressure diff on the gauges was OK according to Freezetech altough my RPM was idle (700), not 1500) There's some serious heat been blown off the condensor when the fan blows which is a good thing, but never do the fan and the compressor run together.
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  #47  
Old 08-13-2012, 01:20 AM
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Re: Harmonic noise coming from engine...

Ok I have been to the dealer I bought the car from Sunco and the service manager spent quiet a bit of time on it. He has put a foam packer between the two ac pipes where they meant going into the fire wall. We have tried hard to replicate the noise and have only succeeded to get it very faitely. I am going to drive it for next couple of days and if it hasnt improved it back to the drawing board otherwise if it has fixed it slightly it maybe touching inside the cabin behind fire wall.

Let you know how I go.

Sean
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  #48  
Old 08-13-2012, 01:30 AM
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Re: Harmonic noise coming from engine...

Ok well I had the car back to the dealer I bought it from (Sunco) the service manager spent quiet a bit of time. He put A foam packer between the ac pipes going into cabin to see if it eliminates the noise. Well we have tried very hard to replicate it and have succeeded only twice however both times extremely faitely. So I am going to drive it for next couple of days to see if it has quietened it right down. If so they may need to pack in between the pipes in the cabin area behind fire wall

Sean
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