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A/C performance troubleshooting - need help please!


tsitalon1
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Galant VR-4 org Post #: 1124013 posted 05/17/13 05:44 PM     Remind Me!  Send Private Message   Edit Post      
Hey guys,

Just moved to Texas and my A/C is not up to snuff.

Short story:
Replaced compressor
Dryer
Expansion Valve
Cleaned Evaporator and housing
Replaced all o-rings
Had A/C shop flush and fill
Heater core bypass
A/F fan resistor bypassed (fan on high when on)

Long story:
clicky

Current gauge readings at 80 ambient:

26-30 Low / 210-225 High
Slight bubbles in sight glass

At 80 ambient, I'm getting 45-50 outlet temps.
At 95 ambient, I'm getting 60-65 outlet temps.

Evap inlet line starts to get hot around 90 ambient and I feel the passenger side of condenser getting hot (115)
Evap outlet line is very cold and condensation is dripping off the pipe.

Using water to cool down the condenser will make outlet temps drop from 60 to 43.

I'm inclined to replace the condenser, but I'm not sure if just adding a 7" fan to the passenger side would help instead.

What are your guys thoughts on all the above?


Edited by tsitalon1 (05/17/13 05:46 PM)

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marvinmadman
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Galant VR-4 org Post #: 1124039 posted 05/17/13 09:14 PM     Remind Me!  Send Private Message   Edit Post      
What are your Hi/Lo pressures and outlet temps while cruising at 55 mph VS parked while reved up to say 3k for 30-60 seconds?



1982/2000 sold
1263/2000 parts
136/1000 work n progress
08 ZX14
10 Ford Flex TT/AWD
05 Galant GTS

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tsitalon1
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Galant VR-4 org Post #: 1124043 posted 05/17/13 09:34 PM     Remind Me!  Send Private Message   Edit Post      
LMAO - How would I obtain my pressures while driving down the road at 55mph?

Outlet temps don't really change much whether stationary or moving. The lowest I was able to get was 43 while spraying water on my condenser at 80 ambient temps

The presence of bubbles in the slight glass make me want to add freon, but the pressures are already spot on i think. - If I could just get it to drop another 10, I'd be happy!


Edited by tsitalon1 (05/17/13 09:36 PM)

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marvinmadman
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Galant VR-4 org Post #: 1124044 posted 05/17/13 09:38 PM     Remind Me!  Send Private Message   Edit Post      
Easy. Route the gauges under the hood and place them under the wiper.



1982/2000 sold
1263/2000 parts
136/1000 work n progress
08 ZX14
10 Ford Flex TT/AWD
05 Galant GTS

Posts: 2353 | From: Lafayette, Louisiana | Member Since: 11/10/03 | IP: (184.40.90.86) | Report this post to a Moderator

marvinmadman
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Galant VR-4 org Post #: 1124045 posted 05/17/13 09:45 PM     Remind Me!  Send Private Message   Edit Post      
If cruising doesn't help outlet temps, throw this thought out the window.

Quoting tsitalon1:


I'm not sure if just adding a 7" fan to the passenger side would help instead.






1982/2000 sold
1263/2000 parts
136/1000 work n progress
08 ZX14
10 Ford Flex TT/AWD
05 Galant GTS


Edited by marvinmadman (05/17/13 09:46 PM)

Posts: 2353 | From: Lafayette, Louisiana | Member Since: 11/10/03 | IP: (184.40.90.86) | Report this post to a Moderator

tsitalon1
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Galant VR-4 org Post #: 1124046 posted 05/17/13 09:46 PM     Remind Me!  Send Private Message   Edit Post      
Good point - Guess I could. What are we looking for exactly?

I"m assuming the condenser temps should drop a little, but not much since I still have the stock IC blocking half of the damn condenser.

So I should see pressure drop a bit right?

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marvinmadman
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Galant VR-4 org Post #: 1124051 posted 05/17/13 10:00 PM     Remind Me!  Send Private Message   Edit Post      
I had a similar problem before. Not saying your system is overcharged, but its possible. On converted systems I usually end up with about 75% recommended charge. But if I have problems I would start with 50% charge and see if the low side dips too low while cruising and add freon if needed. That particular car "90 civic sedan" ended up with 1 can and worked perfect. Low side would go as low as 5 psi and outlet temps were cold as 40.


EDIT ERRRRRR I read the other thread wrong. I thought you put in 33oz of freon.



1982/2000 sold
1263/2000 parts
136/1000 work n progress
08 ZX14
10 Ford Flex TT/AWD
05 Galant GTS


Edited by marvinmadman (05/17/13 10:02 PM)

Posts: 2353 | From: Lafayette, Louisiana | Member Since: 11/10/03 | IP: (184.40.90.86) | Report this post to a Moderator

tsitalon1
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Galant VR-4 org Post #: 1124052 posted 05/17/13 10:14 PM     Remind Me!  Send Private Message   Edit Post      
It has since been charged by an A/C shop...

Overcharged wouldn't show bubbles would it?


Edited by tsitalon1 (05/17/13 10:15 PM)

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marvinmadman
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Galant VR-4 org Post #: 1124053 posted 05/17/13 10:29 PM     Remind Me!  Send Private Message   Edit Post      
I believe the r134a systems tend to not put sight glasses because the oil foams up. Sounds like your condensor isn't up to the task or overcharged with freon or OIL. Too much oil would raise pressure and negate efficiency. Many variables



1982/2000 sold
1263/2000 parts
136/1000 work n progress
08 ZX14
10 Ford Flex TT/AWD
05 Galant GTS

Posts: 2353 | From: Lafayette, Louisiana | Member Since: 11/10/03 | IP: (184.40.90.86) | Report this post to a Moderator

marvinmadman
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Galant VR-4 org Post #: 1124054 posted 05/17/13 10:30 PM     Remind Me!  Send Private Message   Edit Post      
Did you thoroughly clean the system of old oil when you added the PAG?



1982/2000 sold
1263/2000 parts
136/1000 work n progress
08 ZX14
10 Ford Flex TT/AWD
05 Galant GTS

Posts: 2353 | From: Lafayette, Louisiana | Member Since: 11/10/03 | IP: (184.40.90.86) | Report this post to a Moderator

tsitalon1
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Galant VR-4 org Post #: 1124059 posted 05/17/13 11:46 PM     Remind Me!  Send Private Message   Edit Post      
Yep, had the shop flush before charging.

Posts: 309 | From: Montgomery Al | Member Since: 12/29/10 | IP: (72.177.171.237) | Report this post to a Moderator

tsitalon1
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Galant VR-4 org Post #: 1124060 posted 05/17/13 11:54 PM     Remind Me!  Send Private Message   Edit Post      
Quoting marvinmadman:

I believe the r134a systems tend to not put sight glasses because the oil foams up. Sounds like your condensor isn't up to the task or overcharged with freon or OIL. Too much oil would raise pressure and negate efficiency. Many variables




Compressor should be fine since the pressures are 30/220 right?

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galant651
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Galant VR-4 org Post #: 1124064 posted 05/18/13 01:22 AM     Remind Me!  Send Private Message   Edit Post      
220 seems a little bit high but is reasonable, 30 on the low side is actually really being ambiant temp in 80. i would say its more of a cooling problem in the condensor, not that the condensor is bad but theres not enough airflow at idle to reallly cool it.



#651, its a love hate relationship

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galant651
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Galant VR-4 org Post #: 1124065 posted 05/18/13 01:28 AM     Remind Me!  Send Private Message   Edit Post      
what are your high and low side readings when its been sitting and has equalized?



#651, its a love hate relationship

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tsitalon1
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Galant VR-4 org Post #: 1124072 posted 05/18/13 10:32 AM     Remind Me!  Send Private Message   Edit Post      
Are you asking what the pressures are after shutting off the car and waiting 30 minutes?

I'll have to try that. what will that tell us?

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galant651
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Galant VR-4 org Post #: 1124074 posted 05/18/13 11:31 AM     Remind Me!  Send Private Message   Edit Post      
it can help tell you if it was overcharged. how many ounces is it suppose to be charged with?



#651, its a love hate relationship

Posts: 113 | From: twin falls, idaho | Member Since: 03/13/13 | IP: (216.119.172.12) | Report this post to a Moderator

tsitalon1
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Galant VR-4 org Post #: 1124075 posted 05/18/13 11:39 AM     Remind Me!  Send Private Message   Edit Post      
Label on the hood lists 33oz total, though I'm not sure if that's a listing for r12 or r134a. My understanding is this should be oil and freon.

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galant651
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Galant VR-4 org Post #: 1124080 posted 05/18/13 12:59 PM     Remind Me!  Send Private Message   Edit Post      
oil and freon should be 2 different values. and charge amount wont really vary much between r12 or r134. its just a more "economical" freon. does it give you a value for oil and freon or only a total?



#651, its a love hate relationship

Posts: 113 | From: twin falls, idaho | Member Since: 03/13/13 | IP: (216.119.172.12) | Report this post to a Moderator

marvinmadman
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Galant VR-4 org Post #: 1124155 posted 05/19/13 11:46 AM     Remind Me!  Send Private Message   Edit Post      
If you can see light through all 3 you should have good airflow.

Sideways pic FTL

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tsitalon1
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Galant VR-4 org Post #: 1124297 posted 05/20/13 09:14 AM     Remind Me!  Send Private Message   Edit Post   
Quick update.

I decided to add a smidgen more freon. I was carefull not to add *too much** and the gauge readings only moved a few PSI.

Currently I am able to maintain 43 oulet temps, even at 95 ambient temps, but only with the blower on 2 (second lowest setting). If I set the blower to high, the temps raise to 50-52

I've ordered a 7" slim fan to put on the pass side of the condenser and hope to get it even better. I will also remove the radiator and backflush the condenser with some degreaser.

I'll update the thread soon


Edited by tsitalon1 (05/20/13 11:24 AM)

Posts: 309 | From: Montgomery Al | Member Since: 12/29/10 | IP: (199.10.86.148) | Report this post to a Moderator


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