Aug 6, 2015, 11:41 AM
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Common A/C issues: problems and solutions
Registered User
Joined: Sep 2016
Posts: 6
Likes: 0
From: Chicagp
This is not necessarily true. There is a pressure relief valve that has most likely opened because the system is overcharged. The system needs to be evacuated, have a vacuum pulled on it, and be refilled with the correct amount of refrigerant (assuming the vacuum holds).
Champion
Joined: Jan 2011
Posts: 4,099
Likes: 44
From: Pittsburgh, PA or Columbia, SC
Could be either honestly. The front and rear have separate expansion valves and obviously blend doors. I have no experience with the electric blend doors on the 01+ trucks.
If you do end up changing the expansion valve though, be very careful with removing the bolts that hold the expansion valve to the evaporator. Steel bolts into aluminum makes for a pain in the ***. I ended up having to machine my new expansion valve and make a nut out of a larger Allen cap screw to avoid yanking the evaporator out of the dash when one of my bolts sheared off.
If you do end up changing the expansion valve though, be very careful with removing the bolts that hold the expansion valve to the evaporator. Steel bolts into aluminum makes for a pain in the ***. I ended up having to machine my new expansion valve and make a nut out of a larger Allen cap screw to avoid yanking the evaporator out of the dash when one of my bolts sheared off.
Amateur
Joined: Sep 2007
Posts: 25
Likes: 0
From:
Started hearing a rattling coming from my AC compressor. Noise sounds like a spray can being shaken up. Sort of loud, almost sounds like its coming from the back side (right/driver side) of the compressor.
1. Noise doesn't start instantly. Takes about a minute or two after starting up with the AC on.
2. Noise doesn't happen, when AC is turned off.
3. Air still blows cold.
Not sure, if this is the AC clutch since it sounds like its in the compressor vs. the pulley/clutch (bearings).
Thanks for any help on this.
1. Noise doesn't start instantly. Takes about a minute or two after starting up with the AC on.
2. Noise doesn't happen, when AC is turned off.
3. Air still blows cold.
Not sure, if this is the AC clutch since it sounds like its in the compressor vs. the pulley/clutch (bearings).
Thanks for any help on this.
Amateur
Joined: Sep 2007
Posts: 25
Likes: 0
From:
Sorry for the delay in following up. Thought a video would be better than further descriptions. To me it does sound like its the compressor or maybe its the clutch, but I wanted to make sure.
Video (sorry for the wind) with the AC button OFF, air on high...no noise.
Video (sorry for the wind) with the AC button ON, air on high.
@ 0:09 - clutch disengages, noise stops
@ 1:29 - clutch disengages, noise stops
Video (sorry for the wind) with the AC button OFF, air on high...no noise.
Video (sorry for the wind) with the AC button ON, air on high.
@ 0:09 - clutch disengages, noise stops
@ 1:29 - clutch disengages, noise stops
Champion
Joined: Jan 2011
Posts: 4,099
Likes: 44
From: Pittsburgh, PA or Columbia, SC
That's got to be something internal to the compressor. I'd stop using the a/c before it fails completely.
Chances are you're going to be replacing the compressor. The complication is that we have no idea what exactly on the inside is making that noise and how far along it is, so we kind of have to assume the worst here. If something in there is throwing metal filings around the a/c system and you just put a new compressor on, it's probably going to take it out in short order. At a minimum you're going to be replacing the filter/dryer (you should any time the a/c is opened) and doing a flush of the rest of the system. You'll also see recommendations to replace the condenser (parallel flow compressors are next to impossible to completely flush) and the expansion valve(s) as well.
Most compressor manufacturers won't honor a warranty on a new compressor without some evidence of these things being done.
Chances are you're going to be replacing the compressor. The complication is that we have no idea what exactly on the inside is making that noise and how far along it is, so we kind of have to assume the worst here. If something in there is throwing metal filings around the a/c system and you just put a new compressor on, it's probably going to take it out in short order. At a minimum you're going to be replacing the filter/dryer (you should any time the a/c is opened) and doing a flush of the rest of the system. You'll also see recommendations to replace the condenser (parallel flow compressors are next to impossible to completely flush) and the expansion valve(s) as well.
Most compressor manufacturers won't honor a warranty on a new compressor without some evidence of these things being done.
Amateur
Joined: Dec 2012
Posts: 32
Likes: 2
From: Texas
That's got to be something internal to the compressor. I'd stop using the a/c before it fails completely.
Chances are you're going to be replacing the compressor. The complication is that we have no idea what exactly on the inside is making that noise and how far along it is, so we kind of have to assume the worst here. If something in there is throwing metal filings around the a/c system and you just put a new compressor on, it's probably going to take it out in short order. At a minimum you're going to be replacing the filter/dryer (you should any time the a/c is opened) and doing a flush of the rest of the system. You'll also see recommendations to replace the condenser (parallel flow compressors are next to impossible to completely flush) and the expansion valve(s) as well.
Most compressor manufacturers won't honor a warranty on a new compressor without some evidence of these things being done.
Chances are you're going to be replacing the compressor. The complication is that we have no idea what exactly on the inside is making that noise and how far along it is, so we kind of have to assume the worst here. If something in there is throwing metal filings around the a/c system and you just put a new compressor on, it's probably going to take it out in short order. At a minimum you're going to be replacing the filter/dryer (you should any time the a/c is opened) and doing a flush of the rest of the system. You'll also see recommendations to replace the condenser (parallel flow compressors are next to impossible to completely flush) and the expansion valve(s) as well.
Most compressor manufacturers won't honor a warranty on a new compressor without some evidence of these things being done.
