GalantVR4.org The Mitsubishi Galant VR-4 Forum
Galant VR-4 Forums » Galant VR-4 » General VR4 Discussions » A/C expansion valve
Previous thread Next thread

A/C expansion valve


tsitalon1
Member +


Galant VR-4 org Post #: 1119144 posted 04/19/13 03:44 PM     Remind Me!  Send Private Message   Edit Post      
Can the expansion valve be replaced with the dash in place? Is it possible to replce it with the evaporative core in place as well?

I can build motors and tranny's, but I'm sorta a newb at A/C stuff

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

quato
Member
32/1000


Galant VR-4 org Post #: 1119152 posted 04/19/13 04:28 PM     Remind Me!  Send Private Message   Edit Post      
You can. Take the glovebox out and that exposes your evap. Undo the two nuts on top and the ones on the bottom. You may or may not be able to get it out without touching the blower. Of course, it will discharge your a/c system...I assume your system is already empty if you are asking this question. Let me know if you have any more questions. I'm currently doing mine and have been through it several times with a custom condenser setup.

Posts: 230 | From: San Antonio, TX | Member Since: 01/31/12 | IP: (132.3.45.79) | Report this post to a Moderator

tsitalon1
Member +


Galant VR-4 org Post #: 1119160 posted 04/19/13 04:45 PM     Remind Me!  Send Private Message   Edit Post      
Hey neighbor, I just moved to SATX!

Yeah, it's empty, I'm replacing the AC compressor next week and decided to do the drier as well. Would be nice to put a new Evap valve in as well..

I'm preparing for the brutal Texas summers!

Thanks for the advice!

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

Romanova
the coolest person to ever post in the past 2 hours


Galant VR-4 org Post #: 1119161 posted 04/19/13 04:58 PM     Remind Me!  Send Private Message   Edit Post      
Keep us posted how it turns out!



tyler
2016 Explorer PI
2006 LS430
2012 GX460

Posts: 3855 | From: Cypress, TX | Member Since: 08/07/02 | IP: (76.30.185.53) | Report this post to a Moderator

quato
Member
32/1000


Galant VR-4 org Post #: 1119539 posted 04/22/13 05:22 PM     Remind Me!  Send Private Message   Edit Post      
Haha nice! Where abouts in SA? I know there are at least 2-3 other GVR4's around plus there is a really nice 1Ga on Randolph AFB that I lust after almost every day haha.

Posts: 230 | From: San Antonio, TX | Member Since: 01/31/12 | IP: (132.3.45.80) | Report this post to a Moderator

tsitalon1
Member +


Galant VR-4 org Post #: 1121079 posted 05/01/13 03:20 PM     Remind Me!  Send Private Message   Edit Post      
Ok, I got lazy!

Replaced compressor, drier and thats it.

Pulled vacuum on system for 30mins and filled her up. Pressures seem within spec.

A/C only blows about 60 on 90 day. Also, A/C temps climb while car is stationary, so I bypassed A/C fan resistor by connecting resistor wires together and now A/C fan runs on high. Unfortunately this didn't help at all.

Like an idiot, I forgot to purge the charge hose during charging/switching cans.

So now, I'm going to do it again This time I'm going to pull the evaporator out and replace the Expansion valve as well.

Does anyone know if the A/C pressures listed in the service guide are still applicable since we are running R134a now?


Edited by tsitalon1 (05/01/13 03:32 PM)

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

Barnes
Firechicken
908/1000
237/2000


Galant VR-4 org Post #: 1121086 posted 05/01/13 03:46 PM     Remind Me!  Send Private Message   Edit Post      
Although r134a is designed to operate at higher pressures, the service pressures still apply. This is more a function of the pressure rating of the sytems and design of associated components. Nevermind the fact that the limit switches in the system will keep you within certain high/lo bounds.



-Jon Barnes
#580/2000 (Long Gone)
#908/1000 Black (Sold)
#237/2000 White

Posts: 6249 | From: Richland, WA | Member Since: 02/09/03 | IP: (198.232.211.130) | Report this post to a Moderator

tsitalon1
Member +


Galant VR-4 org Post #: 1121222 posted 05/02/13 08:43 AM     Remind Me!  Send Private Message   Edit Post      
I'm starting to get frustrated and need some help.

I have now replaced the compressor, drier, and expansion valve, cleaned the evaporator, vacummed for over an hour and recharged ensuring I purged air between freon cans. (Hood label claims A/C system uses 33oz - I charged ~5oz Pag and 26-28oz R134a)

Gauges read aprox 30/225

A/C Still only blows about 60. A/C temps still climb while car is stationary with bypassed A/C fan resistor and fan on high.

Thoughts?


Edited by tsitalon1 (05/02/13 08:47 AM)

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

Barnes
Firechicken
908/1000
237/2000


Galant VR-4 org Post #: 1121332 posted 05/02/13 07:24 PM     Remind Me!  Send Private Message   Edit Post      
What's the outside air temp?



-Jon Barnes
#580/2000 (Long Gone)
#908/1000 Black (Sold)
#237/2000 White

Posts: 6249 | From: Richland, WA | Member Since: 02/09/03 | IP: (198.232.211.130) | Report this post to a Moderator

Barnes
Firechicken
908/1000
237/2000


Galant VR-4 org Post #: 1121335 posted 05/02/13 07:55 PM     Remind Me!  Send Private Message   Edit Post      
Quick n' easy check:
Make sure your radiator and A/C fans are turning the correct direction. This may sound silly, but it's happened before.

Another check:
When the A/C is running, from inside the engine compartment, find the inlet/outlet to the evaporator. Carefully touch the input line (small) and the output line (large) with your finger. Beware that they may be very hot or cold. Also keep your pressure gauge hooked up so you can note the pressure.

This should help you establish a few things. The small line should be ambient temp, or slight warm. The big line should be much cooler than ambient, or straight up cold.

If the inlet line is HOT, and the outlet is cooler, but not cold, your condenser is not rejecting enough heat. I.e. It's dirty, fans aren't doing something correctly, etc etc.

If the inlet line and the outlet line are the same temp, something is wrong with your expansion valve. Considering your pressure readings, this is unlikely. However, if the inlet and outlet are the same temp, you are probably not getting a pressure drop via the expansion valve. Since your gauges are registering a pressure difference, this would mean you have blockage of some kind between the high side pressure connection, and the evaporator inlet.

If the inlet line is ambient temp or less, and the outlet line is *really* cold, you are not removing enough heat from the cabin. I.E. not enough air is flowing over the evaporator due to a bad blower, air leak, clogging of the exterior, etc.

Another check:
Did you confirm the cold/heat blend door in the large HVAC box after the evaporator is completely blocking off the heater? I would try to visually confirm the lever is moving through its whole range.

If ALL the above stuff seems to check out, I would do this last measure:

You could 100% confirm the heater core is not contributing to temperatures by disconnecting the coolant lines to the core, and looping them.



-Jon Barnes
#580/2000 (Long Gone)
#908/1000 Black (Sold)
#237/2000 White

Posts: 6249 | From: Richland, WA | Member Since: 02/09/03 | IP: (198.232.211.130) | Report this post to a Moderator

tsitalon1
Member +


Galant VR-4 org Post #: 1121914 posted 05/06/13 10:44 AM     Remind Me!  Send Private Message   Edit Post      
Thank Jon,

I'll check on this today, I had visitors this past weekend and didn't have time to look into it.

I can assure you the fans are spinning in the correct direction, and I have double checked the blend door, it seems it is closing properly.

I remember the suction line being very cold to the touch with condensation on it at the compressor and the inlet line fairy hot, but I'll double check.

While driving around yesterday in 82 temps, I was getting 65-70 A/C outlet temps while idling at lights, and around 60 while moving.

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

trexn8
Trifecta of Fail
1209/2000


Galant VR-4 org Post #: 1122425 posted 05/08/13 09:21 PM     Remind Me!  Send Private Message   Edit Post      
Despite what the measured refrigerant amount is, I would consider adjusting the refrigerant charge based high pressure readings and a superheat measurement. This is taken by checking your suction line temperature with a pipe clamp or similar devise and your "saturated" low side temperature when converted from psi to temperature. There should be a difference of about 10-20 degrees (depending on who you ask). You are essentially checking the amount of liquid and vapor refrigerant in the evaporator. Being that it is a TXV system this shouldn't be an issue but worth checking. Also make sure the sensing bulb for the TXV is mounted correctly if applicable.

Hope this helps.



88 Starion
91 Galant VR4
98 Eclipse GSX
06 EVO IX SE
4G63T for life.

Posts: 99 | From: Aurora, CO | Member Since: 09/02/10 | IP: (75.166.143.35) | Report this post to a Moderator

Vr4junkie
writes like a tard
385/2000


Galant VR-4 org Post #: 1122441 posted 05/09/13 12:23 AM     Remind Me!  Send Private Message   Edit Post      
Quoting Barnes:



Another check:
Did you confirm the cold/heat blend door in the large HVAC box after the evaporator is completely blocking off the heater? I would try to visually confirm the lever is moving through its whole range.







I had the same problem on my nx door was open about 20% when fully closed ended up just gluing it shut since I don't care about my heater to much.



385/2000 click


Posts: 596
| From: Some wack town in CA | Member Since: 06/25/11 | IP: (206.29.182.141) | Report this post to a Moderator

tsitalon1
Member +


Galant VR-4 org Post #: 1122532 posted 05/09/13 11:56 AM     Remind Me!  Send Private Message   Edit Post      
Stay tuned...

Gave up and took it to an A/C shop, they diagnosed it as a weak compresor.

Purchased another refurbished compressor and have an appointment on Saturday for full system flush and charge.

Keeping my fingers crossed!

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

tsitalon1
Member +


Galant VR-4 org Post #: 1123491 posted 05/14/13 06:26 PM     Remind Me!  Send Private Message   Edit Post      
Damn it, car has been in the A/C shop for two days. They can't get the A/C outlet temps lower than 60 either.

Getting very frustrated!

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

SouthCaliVR4
Gas Analyzer
825/2000


Galant VR-4 org Post #: 1123496 posted 05/14/13 06:39 PM     Remind Me!  Send Private Message   Edit Post      
You have a blockage in the system, if you where closer...

you might have a condenser issue. Is the second fan in place? New receiver/dryer? lines flushed, no kinks in the hard line that runs over the firewall?



How do you make a small fortune racing? Start with a very large one!!!

Posts: 984 | From: North county San Diego | Member Since: 07/31/10 | IP: (108.216.104.178) | Report this post to a Moderator

tsitalon1
Member +


Galant VR-4 org Post #: 1123497 posted 05/14/13 06:42 PM     Remind Me!  Send Private Message   Edit Post      
Yeah, all replaced. Gauge pressures look good.

See above for list of all done..

Wish you were closer too

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

Barnes
Firechicken
908/1000
237/2000


Galant VR-4 org Post #: 1123498 posted 05/14/13 06:42 PM     Remind Me!  Send Private Message   Edit Post      
Should the air even be able to get below 60 degress with a r-134a swap?



-Jon Barnes
#580/2000 (Long Gone)
#908/1000 Black (Sold)
#237/2000 White

Posts: 6249 | From: Richland, WA | Member Since: 02/09/03 | IP: (198.232.211.130) | Report this post to a Moderator

tsitalon1
Member +


Galant VR-4 org Post #: 1123505 posted 05/14/13 06:57 PM     Remind Me!  Send Private Message   Edit Post      
Good question, from my understanding and reading, yes. Should be around 45-50.

Someone please correct me if I'm wrong.

I can tell you with ambient temps around 80-85, interior car temps are around 110. In it's current state, the AC is not doing a good job of lowering interior temps.

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

tsitalon1
Member +


Galant VR-4 org Post #: 1123602 posted 05/15/13 11:27 AM     Remind Me!  Send Private Message   Edit Post      
Still in shop!

Got a question....

On the A/C computer, there is a rotating setting control marked + and - , What does this do exactly?


Edited by tsitalon1 (05/15/13 11:28 AM)

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

Barnes
Firechicken
908/1000
237/2000


Galant VR-4 org Post #: 1123618 posted 05/15/13 12:33 PM     Remind Me!  Send Private Message   Edit Post      
Is the shop super busy? Otherwise they either A)Have no idea what they are doing or B)Are giving you the run-around.

Honestly, this shit is not the complicated.

When you are running the A/C, does the clutch stay engaged the entire time? Does it cycle on and off?



-Jon Barnes
#580/2000 (Long Gone)
#908/1000 Black (Sold)
#237/2000 White

Posts: 6249 | From: Richland, WA | Member Since: 02/09/03 | IP: (198.232.211.130) | Report this post to a Moderator

tsitalon1
Member +


Galant VR-4 org Post #: 1123620 posted 05/15/13 12:45 PM     Remind Me!  Send Private Message   Edit Post      
No idea, I'm new to San Antonio. My only choice was to google A/C shops.

I'm a DIY guy, I've built 6-8 4g63's, and 6 AWD tranny's, so I tried tackling the A/C.

Everything looked good (gauges, evap lines) just can't get lower temps. Maybe I should bypass the heater core and buy a new condensor?

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

Barnes
Firechicken
908/1000
237/2000


Galant VR-4 org Post #: 1123622 posted 05/15/13 12:46 PM     Remind Me!  Send Private Message   Edit Post      
Sorry, I didn't mean to sound like I was giving you crap. I just think that A/C shop should have figured it out by now.



-Jon Barnes
#580/2000 (Long Gone)
#908/1000 Black (Sold)
#237/2000 White

Posts: 6249 | From: Richland, WA | Member Since: 02/09/03 | IP: (198.232.211.130) | Report this post to a Moderator

tsitalon1
Member +


Galant VR-4 org Post #: 1123637 posted 05/15/13 01:49 PM     Remind Me!  Send Private Message   Edit Post      
No offense taken.

I agree, but short of spending thousands of dollars trying multiple AC shops, I'm kind of stuck. if they can't get it, i will bypass the heater core and see what happens. might try a new condenser as well.

Posts: 309 | From: Montgomery Al | Member Since: 12/29/10 | IP: (70.195.196.224) | Report this post to a Moderator

quato
Member
32/1000


Galant VR-4 org Post #: 1123762 posted 05/16/13 10:43 AM     Remind Me!  Send Private Message   Edit Post   
Where did you take it? Carlisle off of San Pedro helped me out a lot with my custom A/C install. I mostly dealt with the parts dept, can't speak for the service area but they seem pretty good.

Posts: 230 | From: San Antonio, TX | Member Since: 01/31/12 | IP: (132.3.45.83) | Report this post to a Moderator


Pages: 1 | 2
Previous thread Next thread

Extra information
0 registered and 8 anonymous users are browsing this forum.

Galant VR4.org Moderator:  curtis, steve, atc250r, jcgalntvr4-244, cheekychimp, jepherz, Rausch, toybreaker, iceman69510, pot, FlyingEagle 

Print Thread

Forum Permissions
      You cannot start new topics
      You cannot reply to topics
      HTML is disabled
      UBBCode is enabled

Rating:
Thread views: 5088

Rate this thread


News & Events: News | Events
Galant VR-4: Newbies | General VR4 Discussions | Technical Discussions | How To and Info Archive
Marketplace: Parts For Sale | Cars For Sale | Good Guys | Bad Guys
Community: Members' Showcase

Contact Us | Privacy statement GalantVR-4.org

Generated in 0.134 seconds in which 0.075 seconds were spent on a total of 14 queries. Turbo powered.


Hertz's Galant VR-4 Page