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Discussion Starter · #1 ·
So, my car is back again from the shop. This time almost all of the issues have been resolved except for the climate control system. Here's the issue:<p>***Starting with a reset ECU***<p>A/C off, car starts and runs normally. Engine fan operates normally, etc. When you turn on the A/C, all is fine for a while, then the A/C starts cycling off and on every few seconds, then the cycle starts to drag out to more like 5 minutes off and 15 seconds on. During that time the engine fan moves to high speed and starts to sound like it's trying to achieve lift-off. <p>OK, So. This sounds to me like there's a low pressure problem with the A/C since I know that this is what the ECU does to the engine fan when the system's pressure is low. Except that the A/C shop the body shop is using is claiming that the pressure in the system is fine. So I am left wondering what else cold be wrong? I have a feeling they did not replace the receiver/dryer like VADIS says you have to, but its not like that would cause this problem directly? I'm concerned about not having that replaced for system longevity, but its probably not a factor? Also, it seems as if the A/C compressor is noisier than it used to be...<BR><BR>
<i>Modified by adykes at 9:11 AM 6-16-2009</i>
 

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Re: Odd A/C problem (adykes)

Sounds like you need a "recalibration".
 

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Discussion Starter · #3 ·
Re: Odd A/C problem (Short Circuit)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>Short Circuit</b> »</i></TD></TR><TR><TD CLASS="quote">Sounds like you need a "recalibration".</TD></TR></TABLE><p>Sounds somewhat familiar, what exactly does that do?
 

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Re: Odd A/C problem (Short Circuit)

That's more for the interior air circulation blower and dampers (when the system stops blowing heat or goes from hot / cold / hot / cold). <p>His problem is related to the "external" system.
 

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Re: Odd A/C problem (adykes)

Could be an orifice tube issue. Possible there is some junk in there from the AC compressor thats making noise.<p>As for the Drier not being replaced, what was done to the vehicle?<br>They usually call for it replacement but as long as the system isn't opened up for more than an hour, it should be ok to not replace the drier. Like if you only had a line or o-ring replaced, shouldn't be an issue. If the compressor or condensor is replaced, then yes you should do the drier as well as the orifice tube.<p>But it could be a couple different temp sensors as well. We saw a lot of Evaporator Temp sensors go bad. That will shut the AC down. Also bad clutches on the compressor were common. Also the ambient temp sensor can keep the compressor from coming on. There are other software and a couple pressure sensors that all could cause this including the CCM itself.
 

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Discussion Starter · #6 ·
Re: Odd A/C problem (Oceans60R)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>Oceans60R</b> »</i></TD></TR><TR><TD CLASS="quote">Could be an orifice tube issue. Possible there is some junk in there from the AC compressor thats making noise.<p>As for the Drier not being replaced, what was done to the vehicle?<br>They usually call for it replacement but as long as the system isn't opened up for more than an hour, it should be ok to not replace the drier. Like if you only had a line or o-ring replaced, shouldn't be an issue. If the compressor or condensor is replaced, then yes you should do the drier as well as the orifice tube.<p>But it could be a couple different temp sensors as well. We saw a lot of Evaporator Temp sensors go bad. That will shut the AC down. Also bad clutches on the compressor were common. Also the ambient temp sensor can keep the compressor from coming on. There are other software and a couple pressure sensors that all could cause this including the CCM itself. </TD></TR></TABLE><p>The system was cracked open like an egg due to an ill-fated mating attempt with a Toyota Camry...
 

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Re: Odd A/C problem (adykes)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>adykes</b> »</i></TD></TR><TR><TD CLASS="quote"><p>The system was cracked open like an egg due to an ill-fated mating attempt with a Toyota Camry...</TD></TR></TABLE><br>Then for protection, they should have used drier.<br>Wondering if there is a restriction somewhere is any line was bent but not replaced.
 

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Discussion Starter · #8 ·
Re: Odd A/C problem (Oceans60R)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>Oceans60R</b> »</i></TD></TR><TR><TD CLASS="quote"><br>Then for protection, they should have used drier.<br>Wondering if there is a restriction somewhere is any line was bent but not replaced.</TD></TR></TABLE><p>It appears that everything effected was replaced. All the plumbing I can see looks new, the radiator is new, the receiver/dryer is in a hard location to see, but it was not crushed in the fender bender and i didnt see it on the parts list...
 

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Discussion Starter · #9 ·
The dealer said that the A/C system pressure was too high. The compressor sounds better and the system works much better than before. I think there's still something not quite right, the compressor still cycles off strangely giving a warmish / humid busrt of air when cooling, but I'm thankful that it is operating. It'll go back next week for another look att the last little problems.
 

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Re: (adykes)

System pressure too high could mean:<br>It was overcharged.<br>There could be a restriction somewhere on the high side, ie condenser, bent line, clogged drier or ruptured desiccant bag.<br>Orifice tube blockage.<br>Cooling fan not functioning properly.<p>That about covers problems for a "system pressure too high"<p>Hope this helps <br> <IMG NAME="icon" SRC="http://********************/smile/emthup.gif" BORDER="0">
 
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