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Old 08-22-2017, 12:43 AM   #1
57-Geez
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Default ** Calling all experienced A/C guys

I have issues with my 2006 Impala A/C system. I was getting ready for the nationals, making sure all fluids were changed or topped on...preparing for the 3600 mile round trip from Salt Lake to BG and back.... I thought the AC system could be just a little colder.... so I started mucking with it.... thats a technical term, for I think I can fix it with one of these suicide cans from the auto parts store. Let me just say, the system worked fine before I got a hold of it, it was just a little on the "not as cold as I think it should be" side.

After putting what I thought was too much in... went from cold to warm.... then bleeding some freon off into the atmosphere.... making it cold again....The compressor would come on and off at will, no apparent reason it would just turn itself off, then seconds later turn itself back on again.

I replaced the low pressure switch, I then thought I probably got the AC pressure off in the system with my messing with it. I took it to a shop and I'm not convinced they spent much time with it..... the answer was, you need a new compressor.... cost ..... 1000.00 installed. Freon looks okay. However, the high side pressure would not produce an accurate reading.... so they said.

Remember, it worked at first, and at speed on the highway it seems to work fine too, just around town and at slow speeds it blows warm. Cuz the compressor keeps turning off.

I have got gauges and tested the low side and high side... 35 psi and 250 to 300 seems to be within the correct ranges.... And if the coil engages and cools at 75 miles an hour, why doesn't it work around town?

What and I missing?.... car has 80,000 miles
Would the coil only work intermittently, I would think if it was to fail, it would not work at all.

Seems premature to replace the compressor if it works at speed on the highway.
I'm at a loss.

Gil
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Old 08-22-2017, 12:51 AM   #2
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Are you comparing your hi & low temps to the temp's out side, the hotter it gets, the more head pressure you will see and visa versa when the temps drop down. You can find a chart on line if need be,

And if the a/c is working good on the freeway were you are getting max air flow to the condenser, but not at slow speeds, make sure the dedicated electric fan for the a/c condenser (if it has one) is kicking on and off.

If the fan is not working at slow speeds, and the a/c pump kicks out, this tells me the a/c pump is seeing to much head pressure, and the high side pressure is going threw the roof and the high side pressure switch is doing its job, and turning the pump off before it blows the a/c lines
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Old 08-22-2017, 12:56 AM   #3
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Your high side pressure is a bit high. Could be a compressor. Could be a restriction in the system from the stop leak that come in those cans. Those DIY cans from parts stores shouldn't be sold. I suggest taking it to another shop and get a 2nd diagnosis.

Usually when it blows cool at speeds and not around town the fans are not working or your condenser is partially clogged. Not allowing enough heat transfer.
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Old 08-22-2017, 01:04 AM   #4
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When I used the individual cans of freon, I followed the ambient temp and pressure reading/gauge that came with the can. When I got the gauges, to plug onto the high and low sides, they had their own range on the gauge. In reality they were both pretty similar.

I will check the fan to see if there is a dedicated fan for the condenser. I do hear the radiator fans coming on in the driveway when it is idling, and at temperature.

Gil
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Old 08-22-2017, 01:08 AM   #5
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Thanks Nick and guys, When I went to Rock Auto to look at compressors, they recommended changing the oriface valve and the condenser as items to swap out at the same time as the compressor... sounds like thats to cover incase there is a restriction some place.

I was told to not use the stuff that says sealant..... just the freon cans.... live and lean I guess.

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Old 08-22-2017, 12:11 PM   #6
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Nick, you might be on to something... this morning while going into work, it has been cooler in the mornings lately.... the ac worked fine, I have noticed that in the afternoon when it is close to 90, it doesn't want to come on... or the compressor comes on and turns off again..... Aux fans seem to be working...so that would indicate a restriction somewhere? condenser? orafice tube?

Thank you for the input.
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Old 08-22-2017, 02:25 PM   #7
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To much high side pressure.

Don't need a condenser unless a tube is smashed closed.

Make sure the cooling fans run when the AC is in use. The fact that they turn on after idling = the fans work due to coolant temp they need to run during AC use. No air through the condenser = excessive high side pressure.

If the fans run when AC is used:
Change the accumulator & orifice tube should be good to go.

If the fans do not run when AC is used fix that issue first.

IF Auto Temp Control (ATC) engine off, disconnect the battery for 15 seconds to reset the control to default.
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Old 08-22-2017, 09:13 PM   #8
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Churchkey may be on to something sounds like classic clogged orfice tube to me.Does this car have a clutch fan and a electric fan?
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Old 08-22-2017, 10:27 PM   #9
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A clogged orifice tube will usually have low suction side pressure, which will trip the low pressure switch.

Seems like overcharge to me. But everything is ambient temperature dependent too.
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Old 08-23-2017, 01:07 AM   #10
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Quote:
Originally Posted by Rick_L View Post
A clogged orifice tube will usually have low suction side pressure, which will trip the low pressure switch.

Seems like overcharge to me. But everything is ambient temperature dependent too.
my thoughts also....
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