Overheating while running A/C

[0-60motorsports]

One of my friends was just telling me that the radiator has a valve on it and it can be bled by unscrewing it. Is that true guys?

I don’t recall seeing anything on the radiator itself, only the bleeder screw in the top radiator hose.

[eacmen]

One of my friends was just telling me that the radiator has a valve on it and it can be bled by unscrewing it. Is that true guys?

I don’t recall seeing anything on the radiator itself, only the bleeder screw in the top radiator hose.

Only bleeder is the top of the rad hose


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[0-60motorsports]

Ok today's update is that after monitoring AC pressure during warm up and overheating the pressure goes UP. So first thing to be changed and easiest will be the drier and Expansion valve (later). I will be picking up the drier today. Updates to come by Saturday or Sunday.

[yhp2009]

Something else to mention is the compressor. (Sorry to pile on parts on top of parts)
Its my understanding that a failing compressor may cause the engine to work harder causing temps to rise.
Also, the compressor by definition causes the high pressure/high temp environment in the condenser so thats another reason to look into it.

On a side note, this is such a great thread. I think many of us are now seeing similar issues rise up as our cars reach new milestones in age.
Keep us us updated and know that youre doing god's work as many will likely revisit this thread in the future 😁

[0-60motorsports]

Something else to mention is the compressor. (Sorry to pile on parts on top of parts)
Its my understanding that a failing compressor may cause the engine to work harder causing temps to rise.
Also, the compressor by definition causes the high pressure/high temp environment in the condenser so thats another reason to look into it.

On a side note, this is such a great thread. I think many of us are now seeing similar issues rise up as our cars reach new milestones in age.
Keep us us updated and know that youre doing god's work as many will likely revisit this thread in the future 😁

I just installed the dryer and properly recharged the ac system. We will see At noon time on Saturday of this helped. Thank you

[0-60motorsports]

Still over heating but note taking longer to do it. So the changing the dries helped but a little. Net steep change out expansion valve and check compressor.

[eacmen]

Still over heating but note taking longer to do it. So the changing the dries helped but a little. Net steep change out expansion valve and check compressor.

Same ambient temp?


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[0-60motorsports]

Same ambient temp?


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Yes anything above 40c and car overheats with AC on. AC off the temp drops fast back to under half.

[Icecream]

Yes anything above 40c and car overheats with AC on. AC off the temp drops fast back to under half.

Since you recharged it, I am assuming you verified that high and low side pressures were within spec? That would more or less give you an idea of whether or not the compressor was functioning properly.
Did you do a coolant change and alter the mix ratio? What is your mix?
Did it start after changing the condensor? Maybe it was fitted incorrectly and is touching/too close to the radiator --> transferring heat to it instead of the air?
When exactly did this start to happen? Any major work the season before?

[0-60motorsports]

Yes we checked the pressures after recharge and it was perfect.

Coolant just changed a few weeks back just for this issue even though it was new and was tested to make sure the mixture was perfect.

This issue started way before randomly. The condenser is installed perfectly to oe specs as well.

Next will be changing the expansion valve.


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[0-60motorsports]

Expansion valve changed and same crap, still overheating. I’m at a loss. I don’t want to spend money on this issue any more but it has to be solved. Let’s see what tomorrow brings.

[Icecream]

Yes we checked the pressures after recharge and it was perfect.

Coolant just changed a few weeks back just for this issue even though it was new and was tested to make sure the mixture was perfect.

This issue started way before randomly. The condenser is installed perfectly to oe specs as well.

Next will be changing the expansion valve.


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Is the condenser touching the radiator? Did you reinstall the plastic shrouds (both of them)?
Is the radiator mounted properly and sitting on the mounts, properly and correctly secured?
Is your plastic under-tray installed?
It sounds like you replaced every component with BMW parts, correct? Not an OEM supplier but used the actual OE parts from the same manufacturer as BMW on that specific part (specifically for the thermostat and fan clutch/fans? (Speaking of which, did you replace the belt fan with a BMW part? If not, did you inspect it carefully for missing blades (they can be easy to miss if you check too quickly).
Out of curiosity, when the needle moves have you checked inlet/outlet temps at that moment?

[Rudbari]

Do leak down test it maybe something wrong with engine

[0-60motorsports]

Is the condenser touching the radiator? Did you reinstall the plastic shrouds (both of them)?
Is the radiator mounted properly and sitting on the mounts, properly and correctly secured?
Is your plastic under-tray installed?
It sounds like you replaced every component with BMW parts, correct? Not an OEM supplier but used the actual OE parts from the same manufacturer as BMW on that specific part (specifically for the thermostat and fan clutch/fans? (Speaking of which, did you replace the belt fan with a BMW part? If not, did you inspect it carefully for missing blades (they can be easy to miss if you check too quickly).
Out of curiosity, when the needle moves have you checked inlet/outlet temps at that moment?

Hey so I’ll try to answer your questions in the same order as you ask them.

No
Yes
Yes
Yes
Correct
Fan belts and pulleys and tensioner all brand new
Fan is brand new and so is fan clutch
The temps displayed vi the obd or can readout are 94c when it starts moving past half way mark and goes up to 98-99c when the needle is almost at 3/4 mark for the water temp


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[0-60motorsports]

So while I was speaking to the tech today he was telling me when the car Overheats with the AC on he noticed two things. 1: the condenser heats up 2: the ac pressures increase, high side is almost at 300psi which is 50 over normal and low side is 30psi over normal.

This leads me to believe that it could be the compressor and even though the condenser is one year old I’ll change it out as it’s cheap enough. Waiting for final word and correct compressor pn from the shop so that I can order it if it is needed today.