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2006 Dodge Charger Fluctuating A/C Guage Readings


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cincyeric
Novice

Jul 17, 2019, 10:36 AM

Post #1 of 11 (177 views)
2006 Dodge Charger Fluctuating A/C Guage Readings Sign In

Hello,

I have a 2006 Dodge Charger 3.5L with around 68k miles. The A/C is only cooling to about 5-10 degrees less than outside temp.

The high and low side gauge readings rise and fall together. Outside temp is 82 degrees with these readings below. Windows open and A/C on full blast for a few minutes.

Here's where they start: Low side 25psi, high side 125psi

After a couple of minutes, the high and low side each rise to, low side 37psi, and high side 210psi

I then hear a click and they fall back down to low point of 25/125. This click doesn't sound like it's coming from the compressor. The compressor is engaged the whole time during this rise and fall.

After a couple minutes the cycle starts over again.

With the car off, the reading are low side 80, high side 125.

Everything I read/watch seems to show pressure readings remaining relatively constant after the system runs for a few minutes.

I'm hoping someone might be able to help me figure out what these fluctuating readings means.

Thanks!
Eric


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Jul 17, 2019, 11:55 AM

Post #2 of 11 (172 views)
Re: 2006 Dodge Charger Fluctuating A/C Guage Readings Sign In

Are you sure your cooling fan isn't cycling on and off or high and low?



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Jul 17, 2019, 12:24 PM

Post #3 of 11 (158 views)
Re: 2006 Dodge Charger Fluctuating A/C Guage Readings Sign In

? First observations and pressures taken were consistent to me for that performance.
Now with - and I take it that the car is totally shut off you get different high and low readings? For a few seconds not very long. Just that is probably YOU and gauges either getting used to them but it almost can't happen if checking properly,


T



cincyeric
Novice

Jul 17, 2019, 12:31 PM

Post #4 of 11 (155 views)
Re: 2006 Dodge Charger Fluctuating A/C Guage Readings Sign In

I would have sworn they stayed on the whole time. After your question I just double checked and you nailed it. The cooling fan is cycling on and off.

It cycles off after being at the low point for a couple minutes. The pressure starts rising at the same time it cycles off. Then at the high point for both pressure, the fans cycle on and the pressures drop to the low points.

Does this point to anything specific?


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Jul 17, 2019, 12:38 PM

Post #5 of 11 (147 views)
Re: 2006 Dodge Charger Fluctuating A/C Guage Readings Sign In

Most likely low on refrigerant.

Don't just randomly add refrigerant though. The charge needs to be exact. Have it evacuated and recharged using the proper equipment.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



cincyeric
Novice

Jul 17, 2019, 12:42 PM

Post #6 of 11 (145 views)
Re: 2006 Dodge Charger Fluctuating A/C Guage Readings Sign In


In Reply To
Now with - and I take it that the car is totally shut off you get different high and low readings? For a few seconds not very long. Just that is probably YOU and gauges either getting used to them but it almost can't happen if checking properly,


T


Yep Tom, you are right on it as well. The gauges and I are just getting used to each other :) After a few min of being shut off and me checking them today, they both read the same, 105.


cincyeric
Novice

Jul 17, 2019, 12:53 PM

Post #7 of 11 (137 views)
Re: 2006 Dodge Charger Fluctuating A/C Guage Readings Sign In


In Reply To
Most likely low on refrigerant.

Don't just randomly add refrigerant though. The charge needs to be exact. Have it evacuated and recharged using the proper equipment.


Thanks HT! I kind of suspected that, as you said, I just didn't want to blindly add refrigerant.

I guess there has to be a leak somewhere then. Would you suggest adding a dye first to find the leak? Then, have the refrigerant evacuated, fix the issue, then recharged?

Or, is is worth a shot to just have it evacuated and recharged, and see how long it holds?


Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Jul 17, 2019, 1:01 PM

Post #8 of 11 (130 views)
Re: 2006 Dodge Charger Fluctuating A/C Guage Readings Sign In

OK - That's your "static" pressure. It probably is low, smile, it doesn't somehow catch more driving around and be too full ?? So try to find the leak is the game.
Now also get used to your gauges they are NOT all the same as what I may be used to. I can lock my gauges and walk away from the vehicle or make both read either side.
Don't ask - some S/O stuff was made unrealistically well.
Leaks: While here look for oil evidence is the give-a-way where it can't be there by mistake. Condenser stains and find the drip spot/tube for the evap. and stick a Q-Tip in it if oily OMG get an air sickness bag (about now Boeing would give you one) that's nasty, you'll puke alright when you see how hard those are.
From there a sniffer or also check the dang ports with caps off with soap and water! Sniffers vary how and when you get slow leakers not usually worth buying one IDK right now the going costs.
Just whatever you do, do NOT overcharge the thing! No crap just pure 134a or if this is the other I don't do those meaning 1234yf I'm too old to take on more from what I know if that you are in trouble to dealer only probably forever but plead IDK at all I would touch those myself at this point,


T



Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Jul 17, 2019, 1:18 PM

Post #9 of 11 (116 views)
Re: 2006 Dodge Charger Fluctuating A/C Guage Readings Sign In

You can add dye in the process of the evacuate and recharge. You need to charge it at least once to get an idea how long it will last so you can know how serious the leak is. If it lasts say, a year, it would be a very slow leak.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



cincyeric
Novice

Jul 17, 2019, 4:44 PM

Post #10 of 11 (91 views)
Re: 2006 Dodge Charger Fluctuating A/C Guage Readings Sign In


In Reply To
OK - That's your "static" pressure. It probably is low, smile, it doesn't somehow catch more driving around and be too full ?? So try to find the leak is the game.
Now also get used to your gauges they are NOT all the same as what I may be used to. I can lock my gauges and walk away from the vehicle or make both read either side.
Don't ask - some S/O stuff was made unrealistically well.
Leaks: While here look for oil evidence is the give-a-way where it can't be there by mistake. Condenser stains and find the drip spot/tube for the evap. and stick a Q-Tip in it if oily OMG get an air sickness bag (about now Boeing would give you one) that's nasty, you'll puke alright when you see how hard those are.
From there a sniffer or also check the dang ports with caps off with soap and water! Sniffers vary how and when you get slow leakers not usually worth buying one IDK right now the going costs.
Just whatever you do, do NOT overcharge the thing! No crap just pure 134a or if this is the other I don't do those meaning 1234yf I'm too old to take on more from what I know if that you are in trouble to dealer only probably forever but plead IDK at all I would touch those myself at this point,


T


Thanks for the tips Tom. All very helpful. Boy it'd be nice if it just caught more from driving :) I'll get busy looking for the leak.


cincyeric
Novice

Jul 17, 2019, 4:47 PM

Post #11 of 11 (89 views)
Re: 2006 Dodge Charger Fluctuating A/C Guage Readings Sign In


In Reply To
You can add dye in the process of the evacuate and recharge. You need to charge it at least once to get an idea how long it will last so you can know how serious the leak is. If it lasts say, a year, it would be a very slow leak.


Got it. Thanks HT for your help! That makes sense. Hopefully the dye will help in my leak detection efforts.






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