Ac issue

[Destro408]

Hey just recently got a 2012 35i with ~80k miles and it has been great but out of nowhere the ac started blowing hot. From what I can tell the clutch isn’t kicking on, I was going to just run 12v to it but wasn’t too sure. I only have a ac recharge from autozone for a gauge and it’s showing 90psi on low side as of right now. Any help would be great

[ard]

take it to a proper AC shop, have them do a evacuate, leak, and recharge to the correct weight of freon. They should also add dye trace. DO NOT USE AN AUTOZONE RECHARGE KIT.



You are 'just gonna run 12V to it'???!?! What a hack.


Fix it, dont ruin it.


www.newtis.info

[B4_685]

Ard is right - be very careful with the way that guys on youtube by just ‘adding freon’ - you can easily damage the compressor by overcharging if you do it with little or no thought about how the system is designed. Also, there are 2 different compressors in the BMWs I know - clutchless and clutched. You cant just run 12V to the coil and hope everything fans out - these systems are complex and if it just stopped working there is a reason....


2012 E70 N63 50i

[Destro408]

I meant running the 12v to see if the compressor kicks on and clutch engaged, I also had a question about if it’s safe to do a brief 12v to the pressure switch to rule that out, I’m not fully amateur I’m just new to this platform. Have fully rebuilt e39s and my current e90

[Mackskibum]

Originally Posted by Destro408

I meant running the 12v to see if the compressor kicks on and clutch engaged, I also had a question about if it’s safe to do a brief 12v to the pressure switch to rule that out, I’m not fully amateur I’m just new to this platform. Have fully rebuilt e39s and my current e90

This post tells us all we need to know. You don’t understand how the system works. Does your AC have a clutch or is it variable displacement? Using a BMW capable code reader are there any codes related to climate control? Why do you think putting 12v to a switch that is designed to send a signal by completing a path to ground is a good idea?

It’s not a ‘74 Matador.

[Destro408]

Originally Posted by Mackskibum

This post tells us all we need to know. You don’t understand how the system works. Does your AC have a clutch or is it variable displacement? Using a BMW capable code reader are there any codes related to climate control? Why do you think putting 12v to a switch that is designed to send a signal by completing a path to ground is a good idea?

It’s not a ‘74 Matador.

To bypass the switch? And yes it has a clutch on it. Correct I don’t know the system on a new car to me, I’ve read the link that was posted and I don’t have a scan tool capable of telling me faults that aren’t throwing a cel.

[ard]

dont run voltage to anything. Use a meter to troubleshoot.



If you know how the circuit works. you should be able to place a meter on points in the circuti and determine if it is working properly.


Did you notice the BMW service manual link I prvided? Might have already seen it, but it should give you everything you need

[tumbler]

your ac compressor is probably shot. mine went out last month, scan tool shows a passenger jbe compressor error. for what its worth, i would get a new idler pulley and belt if your replacing, cheap and easy prevention maintenance.

[Destro408]

Originally Posted by tumbler

your ac compressor is probably shot. mine went out last month, scan tool shows a passenger jbe compressor error. for what its worth, i would get a new idler pulley and belt if your replacing, cheap and easy prevention maintenance.

Yeah I’ll probably just end up replacing them all, just strange to me how this car has like 80k on it and it’s out. When my e90 has 200k and never had an issue and my e39 had like 300k with no issues lol

[ard]

Originally Posted by tumbler

your ac compressor is probably shot. mine went out last month, scan tool shows a passenger jbe compressor error. for what its worth, i would get a new idler pulley and belt if your replacing, cheap and easy prevention maintenance.

Ya think?

Based on what he posted, that is your diagnosis?!? I mean great you just joined, kudos for your 4 posts.... gotta start somewhere.

Ive read a few hundred thousand post on the E70. AC compressor failures are relatively rare.

“I’ll just replace them all”?!?

Diagnose the problem first....