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Diagnosis begins

uunfews on Wed September 03, 2008 9:12 PM User is offline

Year: 2001
Make: Honda
Model: Civic
Engine Size: 1.7
Refrigerant Type: 134a
Ambient Temp: 82
Pressure Low: 20
Pressure High: 205
Country of Origin: United States

Ok I am ready to begin with the repair.

Here is the info I have gather thus far. Thank you in advance to all you helpful folks!!!

Ambient temp: 81-82F
Static Pressure Low: 87-88psi
Static Hi Pressure: 85-87psi


Engine at 1500rpm/all 4 windows opened/doors closed/max ac/max blower/speed kept steady for 5 minutes while watching gauge
ambient Temp 81-82F
low pressure 19-21psi
hi pressure 200-210


So what do you think of my pressure readings? The needle fluctuated slightly due to rpm I think (my helper tried his best to keep it steady.) The clutch kicked off twice lasting briefly in 1-2 seconds during which time the hi pressure dropped off slightly to 180 psi (fuzzy guessing at number since it happened so fast) while the low rise to approx 45-50psi then it came back on.

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Newbie wanting to learn how to fix his 01 Civic AC in this freaking hot Dallas TX area.

Edited: Wed September 03, 2008 at 9:52 PM by uunfews

mk378 on Wed September 03, 2008 9:26 PM User is offline

The clutch cycles off because the evaporator is cold. Is the suction line cold? If it is but warm air from the vents you have a reheating issue, not a problem with the refrigeration system.

uunfews on Wed September 03, 2008 9:44 PM User is offline

Quote
Originally posted by: mk378
The clutch cycles off because the evaporator is cold. Is the suction line cold? If it is but warm air from the vents you have a reheating issue, not a problem with the refrigeration system.

Mk378, air is cold though I didn't measure the temp. Suction line is cool if blower is at max but cold and sweating if blower switch is at midpoint or less. Car never has any problem blowing cold air just a noisy compressor whenever clutch is engaged since I bought it.

I bought a new Sanden model 4913-trs090 as a replacement for the Sanden 3654-trsa90 in my car. Though I don't know if this is the correct replacement unit. The part guy says that it is the correct part and it is the only one showing on his computer. The other model is Sanden 4968, which I feel could also be the right part.


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Newbie wanting to learn how to fix his 01 Civic AC in this freaking hot Dallas TX area.

Edited: Wed September 03, 2008 at 9:50 PM by uunfews

TRB on Thu September 04, 2008 1:05 AM User is offlineView users profile

One has a single wire plug and one has a 3 wire plug. Is this one of our staff or somewhere else?

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mk378 on Thu September 04, 2008 1:38 AM User is offline

They're all the same core unit. The difference among model numbers is external stuff like the ports, pulley, mounting, plug, and direction of rotation. Make sure yours is labeled for counterclockwise rotation, as Civic engines turn counterclockwise. Though it seems it wouldn't work properly or last for more than a few seconds turning the wrong way.

uunfews on Thu September 04, 2008 9:10 AM User is offline

Tim:

I bought from Omega USA.com. They are like next door to me here in Dallas TX otherwise I would have buy from you.

MK378: The compressor does say ccw or counterclockwise on the label. From general outside observation they look to be the same-6 groove pulley, plug, external body casting, etcc... Would I be okay with installing it ? Do I have the correct part?

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Newbie wanting to learn how to fix his 01 Civic AC in this freaking hot Dallas TX area.

TRB on Thu September 04, 2008 10:58 AM User is offlineView users profile

They are good guys and I even had dinner last night with one of their employees. That compressor will work with either switch. The wiring is all related to the heat switch which can be adapted either way.

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When considering your next auto A/C purchase, please consider the site that supports you: ACkits.com
Contact: ACKits.com


Edited: Thu September 04, 2008 at 10:58 AM by TRB

uunfews on Thu September 04, 2008 12:00 PM User is offline

Quote
Originally posted by: TRB
They are good guys and I even had dinner last night with one of their employees. That compressor will work with either switch. The wiring is all related to the heat switch which can be adapted either way.

Which switch are you talking about? The only electrical thing on the compressor is the plug to the clutch/coil that I know of. What must be done to it??? It seems to be that I don't have the right part then since there are modification(s) required?

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Newbie wanting to learn how to fix his 01 Civic AC in this freaking hot Dallas TX area.

Edited: Thu September 04, 2008 at 12:01 PM by uunfews

mk378 on Thu September 04, 2008 2:53 PM User is offline

These should have a thermal protection switch on the back end of the compressor near the discharge line. If the compressor overheats (usually due to low refrigerant charge) it cuts off. The switch may or may not be included with a new compressor. A previous owner of the car may have removed and bypassed it. There are 2 small wires for it. It is wired in the low-level control circuit, in series with the pressure switch.

Chick on Thu September 04, 2008 8:01 PM User is offlineView users profile

Civic scroll compressors have a switch on top that is integrated with the coil plug, you may have to use your old switch if it this is a reman and they cut the wire (they don't warrant electrical sensors, or switches) but it should be easy to see, the other difference is as Tim stated, check your old one against the new one, any difference should be apparent.. like one wire connector or two or three.. hope this helps..

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Chick
Email: Chick

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