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2012 Impala Cooling Fans

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Discussion starter · #21 ·
Impoor said:
What kind of controller do you have dual zone. ..manual.or auto?
Did you ever think about your ambient temperature sensor
Manual push recirculate button and fresh air button at the same time with key on hold about 10 seconds ..turn key off.
Dual and Auto pull hvac fuse turn key on not start. Turn key off wait minute reinstall hvac fuse start car don't touch hvac controller ..it will reset you will hear actuators turning on off...when you hear no more sounds from hvac ..turn key off ...wait 15-20 seconds ..restart the car
Test all functions .
Click to expand...


Dual controls, manual. 2012 impala ltz with the heated seat controller.
I did think about the ambient temperature sensor. Other people said they had to have it reprogrammed. I tried resetting it, nothing.
 
#24 ·
One other reason the low speed fans will not work is how the low speed relay is installed...if you refer to the wiring diagram for the relays play close attention to pins 30 and 87...relay 1 and 2 (5 pin) go upside down and 3 high speed goes right side up...meaning you can read everything on it.. Not standing on your head lol
Most relays will show the pin numbers on them
If there is no power to all relays emission fuse 2 should be checked..
Last 15 amp fuse on row below ac relay
 
Discussion starter · #25 ·
Impoor said:
One other reason the low speed fans will not work is how the low speed relay is installed...if you refer to the wiring diagram for the relays play close attention to pins 30 and 87...relay 1 and 2 (5 pin) go upside down and 3 high speed goes right side up...meaning you can read everything on it.. Not standing on your head lol
Most relays will show the pin numbers on them
If there is no power to all relays emission fuse 2 should be checked..
Last 15 amp fuse on row below ac relay
Click to expand...
@Impoor
Fuses/relays all work and are installed correctly. I bought a new hvac control module and had to programmed. Everything else works, no check engine lights.

Fans still don't come on.
It was 74 degrees
Ac high is reading 100psi
Ac low is reading 85psi
 
#26 ·
Did you use parts that were used or new ?
How did you (program) the climate control module ?
I would like to know.
You have checked the wire from computer to low speed relay?
Ground behind R/ headlight and by trannie clean and tight ?
Can you explain everything no secrets.
Was the car running and ac on max and fan also engine warmed up when you got those ac pressure readings ?
After all these questions are answered l can give you a better answer to what is wrong.. Hopefully it's not the worst.
 
Discussion starter · #27 · (Edited)
Impoor said:
Did you use parts that were used or new ?
How did you (program) the climate control module ?
I would like to know.
You have checked the wire from computer to low speed relay?
Ground behind R/ headlight and by trannie clean and tight ?
Can you explain everything no secrets.
Was the car running and ac on max and fan also engine warmed up when you got those ac pressure readings ?
After all these questions are answered l can give you a better answer to what is wrong.. Hopefully it's not the worst.
Click to expand...
Brand new climate control unit AC Delco. Chevy programmed it.
Ground is tight behind headlight.
Car was warmed up as I just drove 15 miles to the shop and let the car idea for another 5-10min. Ac was on max, and fan was on max. We even checked it at about 2k rpm and the reads were very similar.

Haven't check Ground by tranny? Where is that Ground?
Haven't checked wire from computer to relay

I was going to check the compressor pigtail to the pressure solenoid (back pigtail). When I changed the compressor, that pigtail was covered in dirt, oil, etc.

Let me throw you for a loop. I changed everything but the ac hoses and lines. I blew the lines out with air. I put 20oz 134a and 5.10 oz of oil back into the system. My shop guy said I could potentially have 6oz or 7oz of oil from what was left in the lines and evap.
 
#28 ·
Ground by trannie is under air box close to starter follow harness you will get to it..
Bottom left pin at relay and pin 59 at computer dark green beside dark blue under air box also
One thought is wiring also it is rare but is possible that the low speed diode has failed...you have to open up loom and trace where white and grey wires from fan motor meet with diode in between..l have never searched it out... Somewhere between fan motor and fuse box...l believe it is closer to fuse box if wiring diagrams are right..
 
Discussion starter · #29 ·
Impoor said:
Ground by trannie is under air box close to starter follow harness you will get to it..
Bottom left pin at relay and pin 59 at computer dark green beside dark blue under air box also
One thought is wiring also it is rare but is possible that the low speed diode has failed...you have to open up loom and trace where white and grey wires from fan motor meet with diode in between..l have never searched it out... Somewhere between fan motor and fuse box...l believe it is closer to fuse box if wiring diagrams are right..
Click to expand...
Let me throw you for a loop. I changed everything but the ac hoses and lines. I blew the lines out with air. I put 20oz 134a and 5.10 oz of oil back into the system. My shop guy said I could potentially have 6oz or 7oz of oil from what was left in the lines and evap.
 
#30 ·
Probably even more...Your supposed to measure the amount of oil that drains from the compressor and add that amount in new compressor
Thats part of cooling performance not cooling fan operation unless ecm main computer commands system down.. As explained before low speed fan circuit is a series circuit so anything in the circuit that fails will shut it all down including( if ) ecm or bcm being the problem ..hope not
The diode is part of it also.
There is a ground also that is under the dash close to steering wheel for climate control module.
Without checking myself l don't know why these other guys can't figger it out.. They have the gauges and scanners sillyscopes multimeters.. But lacking something...Guess what.
 
Discussion starter · #31 ·
@Impoor

I appreciate the back and forth communication. Thank you!

I recovered the system, all 20oz of 134a and 1.5oz of oil. I put the 20oz of 134a back in and BOOM, the system blows cold and the fans work on low and high.
The System had to much oil and the computer must of shut down the fans. I am going to do one more recovery this week and see how much oil I recover.
Assuming, I had 6-8oz of oil. Oil from the ac lines and evap. Everything else was changed.

I did fix all the grounds, chase wiring, checks fuses, pigtails and relays.
 
#32 · (Edited)
Glad to hear something made it work... The extra oil would effect the cooling performance. I believe the grounds was your problem with the fans ..since they work by grounding out.
BTW
Did you change the condenser filter with a new one ? Desiccant bag
 
#34 ·
Beardtastic said:
Have you resolve this issue? I’m having a similar problem except it’s only one fan that will not run.
Click to expand...
If one fan works and one doesn't, most probably it's the fan itself that's at fault. Check voltage going into each fan when the fans should be activated to confirm. If the faulty fan has no voltage, then look elsewhere in the circuit....
 
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