AC Takes forever to blow cold.

[andrewwynn]

Sensor protects the compressor by disabling the compressor when there is no freon. If you are absolutely positive there is freon you can force it to work when the sensor is broken "open" by shorting the connector.

You risk damaging the compressor should the freon leak out and you try to use it

[snik]

Originally Posted by andrewwynn

Sensor protects the compressor by disabling the compressor when there is no freon. If you are absolutely positive there is freon you can force it to work when the sensor is broken "open" by shorting the connector.

You risk damaging the compressor should the freon leak out and you try to use it

Ahhhh. I see now. Ok.


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[80stech]

Since open turns on the fan that must signal high pressure to the IHKA so shorting the circuit would probably signal low pressure (low freon) and the system would not turn on. Anyway why would you want to replace the sensor if you suspect the problem was the connection? If you do need to change the sensor there is a chance that there is a schraeder valve under it but maybe try to verify that(maybe someone can chime in on that) before hand. Having the system work after cleaning the connections doesn't really match with the theory of operation of the sensor unless the IHKA is reacting by shutting down the system if it sees confusing readings. Interesting.

[FRod1981]

Ok so we swapped compressors and recharged. I got AC all that time now. And a lot colder than before. So if your car takes a while to get cold but then stays like that the rest of the day only to stop working when it’s been sitting for a couple hours it’s 100% the compressor.

[andrewwynn]

There are no "100%" in car repair or there wouldn't be forums such as this only one big checklist.

That said, the problems are much easier to solve when you have the proper symptom diagnoses: in the case of AC it's nearly pointless to work without measuring both high and low pressure

[80stech]

Originally Posted by andrewwynn

There are no "100%" in car repair or there wouldn't be forums such as this only one big checklist.

That said, the problems are much easier to solve when you have the proper symptom diagnoses: in the case of AC it's nearly pointless to work without measuring both high and low pressure

+10

[Crowz]

Originally Posted by andrewwynn

There are no "100%" in car repair or there wouldn't be forums such as this only one big checklist.

That said, the problems are much easier to solve when you have the proper symptom diagnoses: in the case of AC it's nearly pointless to work without measuring both high and low pressure

If your referring to the "if your x5 takes forever to start cooling but cools find till it sits overnight again" then yes its 100%. This has been proven time and time again. I posted to fix for this a few pages back.

Also gauges are useless for this fix since its a variable compressor and doesn't do anything till its internal valve gets "in the mood" to allow it to compress anything.

So as I and others have said over and over if it takes a long time to ever start cooling and then starts cooling and works flawless all day till you turn the car off and let it sit over night its the compressor that needs replacing 100% of the time. No if ands or buts on the X5's.

[upallnight]

Originally Posted by Crowz

If your referring to the "if your x5 takes forever to start cooling but cools find till it sits overnight again" then yes its 100%. This has been proven time and time again. I posted to fix for this a few pages back.

Also gauges are useless for this fix since its a variable compressor and doesn't do anything till its internal valve gets "in the mood" to allow it to compress anything.

So as I and others have said over and over if it takes a long time to ever start cooling and then starts cooling and works flawless all day till you turn the car off and let it sit over night its the compressor that needs replacing 100% of the time. No if ands or buts on the X5's.

I would have to disagree with this statement. The fact that the high side does not develop the pressure needed for the refrigerant to work as designed will lead someone familiar with mobile AC system to conclude that the variable compressor is not working.

[Crowz]

Originally Posted by upallnight

I would have to disagree with this statement. The fact that the high side does not develop the pressure needed for the refrigerant to work as designed will lead someone familiar with mobile AC system to conclude that the variable compressor is not working.

Well the problem with that line of thought has to do with ALL of the compressors of this type making no meaningful pressure till the valve in the compressor kicks in. Were back to what I said from the start.

If it takes a long time to start cooling but works flawless eventually and continues to work flawless till its allowed to sit overnight then its the compressor. The gauges serve no real purpose since this symptom is unique to the variable compressor setup and is a guaranteed diagnoses in this situation.

The gauges will tell you the same thing that you find out when cold air comes out the vent in this situation.

[snik]

So I think I found that high pressure sensor. I unplugged it and cleaned it. This was Sunday, or Monday. Can't recall.
Anyway, I have a 20 minute commute to work. I drove the X5 to work everyday but Friday and the AC never cut out like it's been doing. I left it on all the time, even with windows down.
Anyway, today. I had to step on it to beat a red light on he way home after running around all day doing errands.
Transmission kicked down two gears. Then literally as I cleared the light. The AC stopped cooling. What was odd. Is it was over 100* F. But it wasn't instantly hot as balls like it normally is when it cut out. It was like the temperature was set to 75 with the AC on.

Any thoughts?
I'm thinking that it's a leak somewhere for sure.


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