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Civic with High Pressures?

Last_One_in on Tue August 12, 2008 12:27 AM User is offline

Year: 1997
Make: Honda
Model: Civic EX
Engine Size: 1.6
Refrigerant Type: 134a
Ambient Temp: 112
Pressure Low: 37
Pressure High: 265
Country of Origin: United States

Hi out there...

well to begin this civic never really cooled very well. origionally it went back to honda quite a few times but its never been resolved. i live in las vegas where the temps are pretty high so i decided to try and fix it. ive read the posts on the forums here (great forum) and gave it a shot. i had a local shop recover the refrigerant and i opened the system up, flushed the lines, evaporator, and condenser (cleaned the fins out on both), changed the oil in the compressor (4.5 oz PAG 46 here .5 in condenser and .5 in drier), and added a new txv and lastly a receiver/drier. replaced all the o-rings and went to pull vacuum ( https://www.ackits.com/pc/90062-a/Vacuumpump/Mastercool+3.0+CFM+Single+Stage+Vacuum+Pump - ackits had it to my house in 2 days very well protected in box - thanks guys!). vacuum was pulled for 30 minutes then left it sitting for 2 hours with no leaks. so i went ahead and vacuumed it for another hour while i was cleaning up. charged it with the first can and the static pressure was 127 psi. started the car (idle 28/low 175/hi) and charged the second can to total system of 21 oz. the pressures are:

idle:
37 low - 265 high - 61 vent temp
1500 rpm:
23 low - 345 high (needle was bouncing around) - 55 vent temp

are those pressures too high on the high side? how can i get them lower if it needs to be lower? did i miss something or not do something correctly?

strange thing is when the fan is on setting 1 the pressures go down to 17 low / 235 high with a vent temp of 45 and it starts to cycle the clutch - at idle.

the car is turbocharged - would heat from the turbo affect the compressor (they are very close)?

sorry for the long post but these are the details ive seen asked in other post and just trying to cover the bases. ive got a few more questions because im still learning but hopefully this will get me going in the right direction.

thanks.

Chick on Tue August 12, 2008 7:38 AM User is offlineView users profile

At an ambient temp of 112, I think you can't really ask for more..especially getting 45 degrees on lower fan settings.. Not only are you cutting the temp in half, but removing mositure as well. I think it's cooling just fine....

-------------------------
Chick
Email: Chick

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Freedoms just another word for nothing left to lose

mk378 on Tue August 12, 2008 9:04 AM User is offline

In hot weather you really need to put a Civic on recirculate to get cold inside. Maybe the turbo is also impeding the condenser airflow. Is it a stock condenser fan or has that been modified so the turbo will fit?

94RX-7 on Tue August 12, 2008 2:20 PM User is offline

Quote
Originally posted by: Last_One_in
strange thing is when the fan is on setting 1 the pressures go down to 17 low / 235 high with a vent temp of 45 and it starts to cycle the clutch - at idle.


That's not strange that's normal behavior. The evaporator is getting super cold with so little air moving across it and the thermoswitch on the evaporator is causing the compressor to cycle off to prevent it from freezing up into a block of ice.

Last_One_in on Wed August 13, 2008 8:41 PM User is offline

thanks for the replies....

Chick - do you think those pressures are ok or is it going to affect anything being that high?

mk387 - that was with the a/c in 'recirc' mode. the temps with it in 'fresh' mode are [email protected] and [email protected] rpm. the intercooler does impede air to the bottom third of the condenser but even before the turbo was put in it still couldnt get cold. luckily i didnt have to modify the condenser fan to get the turbo in but it does sit about 2 inches behind it with the downpipe coming about an inch away from the back of the compressor. the downpipe has thermal wrap on it. its a large turbo (T04E/T3) but it makes the car fun to drive.

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