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Old 06-11-2012, 09:59 PM   #1
ur2punk
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Default A/C problem on MY03 ...

Greetings!

My A/C started to blow warm air so I took it to my trusted mechanic. He was able to find a major leak and also refilled the freon. I thought it was fixed.

But it's back to square one. The interesting(?) thing is that it blows *cold* air for the first 5 to 10 seconds after I turn on the A/C switch.

Because it blows blast of cold air for the initial 5 to 10 seconds when I turn the switch on, is there any electrical part, like a thermostat (if there's such a thing on the A/C system), that can be potentially be the root cause?

Thank you for your help!

Rob
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Old 06-11-2012, 10:10 PM   #2
2002Bugseye
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Did he evacuate the system (Hook it up to a vacuum pump or recovery machine and pull a vacuum) before adding the refrigerant?

If no, then there could be excess moisture in the system which will freeze right after the metering device, I believe we have a thermal expansion valve, and it will stop all flow of refrigerant which doesn't allow the A/C to operate properly.

To check for excess moisture, activate your A/C until it stops blowing cold air, then turn it off for 2-5 minutes, and try it again. If it blows cold air and repeats the process, it may need to be evacuated and refilled.
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Old 06-18-2012, 09:20 AM   #3
ur2punk
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Hi 2002Bugseye,

Thank you. I will ask him this morning as I have oil change. And yes - your last sentence seems to be what's happening. Just turning it off & on immediately will not blow the cold air subsequently. But if I wait before turning it on it blows cold for another 5 - 10 secs. Actually, I'm going to print out this thread so I don't mistakenly relay something different (I love my bugeye but I'm not mechanically inclined)

Rob
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Old 06-18-2012, 09:33 AM   #4
2002Bugseye
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Not a problem Rob, it's A/C season anyways, I hope you get everything sorted out.

2002Bugseye
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Old 06-18-2012, 12:40 PM   #5
ur2punk
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Hi 2002Bugseye,

I checked with him this morning and yes, they did evacuate the system. He said he'll put his tools on again later in the week to check the static pressure, etc. ...

Since the symptoms are almost exactly what you wrote earlier, is there a part in the A/C system, like the "thermal expansion valve" you wrote about, that can go bad and is replaceable?

Thank you for your input!

Rob
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Old 06-19-2012, 03:37 PM   #6
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there is a tsb on the valve inside the evaporator that it needs to be replaced... it is reading improperley and casuing evaporator to freeze and blow warm/hot air ... then if you wait for it to unfreeze it will blow cold again
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Old 06-19-2012, 07:43 PM   #7
ur2punk
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scoobydude92,

thanks! is the "tsb" another word for "expansion valve"? I just found this thread that seems to be close to what I'm experiencing and was wondering: http://www.clubwrx.net/forums/genera...ed-c-help.html

Thank you.
Rob
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Old 06-19-2012, 09:36 PM   #8
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Quote:
Originally Posted by ur2punk View Post
scoobydude92,

thanks! is the "tsb" another word for "expansion valve"? I just found this thread that seems to be close to what I'm experiencing and was wondering: http://www.clubwrx.net/forums/genera...ed-c-help.html

Thank you.
Rob
A tsb is a 'Technical Service Bulletin'

It's basically information of a very common problem with a vehicle, it contains the issue, why it happens and the repair. It basically allows the technician to diagnose a problem a lot faster and easier. However the tsb may not always be the route cause of the problem, but as a technician you are taught to start with the tsb providing the symptoms match.

That thread shows you how to remove and replace the expansion valve which is the part the above poster was talking about, IF that is your issue then that would be a great thread to follow.

Last edited by TwoFifty; 06-19-2012 at 09:42 PM.
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Old 06-20-2012, 11:32 AM   #9
ur2punk
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Thank you TwoFifty - I misunderstood. So if the root cause is what is in the TSB, is it still covered under an long-expired warranty or am I still responsible for the labor and/or part including diagnosis of the root cause?

Thank you.
Rob
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Old 06-20-2012, 04:40 PM   #10
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If you have proper freon levels it could be one of two things. There's a sensor by the grill that is "easily" swapped. There's the expansion valve thingy that is behind your glove compartment that is a bit of a whore to replace and requires evac/fill of system. Either could cause the problem, so I bought both but my system is now working fine this year *knock on wood* but I'm out a good chunk of change for the parts. Oh well.....
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Old 06-20-2012, 04:58 PM   #11
ur2punk
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Hi Unabomber,

Thanks for the tip on the sensor by the grill. The expansion valve seems like something I'll definitely need my trusted mechanic to handle but if the sensor by the grill is "easy" maybe I can go that route first ... is there a name for that sensor I can search the part for?

DUH - I just found out that the thread with detailed pics on changing the expansion valve had more than one page so I need to read more anyways!

Thank you!
Rob
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