Hi y’all any idea if there is a sensor that triggers the condenser fans to kick on? The passenger side is at full blast while the driver side one is not turning on at all. I’ve ruled out the control modelices they are attached to and are both working fine when switched to the other side. I’ve even went as far as connecting the condenser fan over to the passenger side and it kicks on like normal. I have an upcoming appointment and based on the over the air diagnostics they are wanting to replace the a/c compressor unit. Which sounds wrong to me since the ac is working just fine. The only time it gives me any issues is when charging in the 100+ degree Arizona heat, one condenser fan can’t keep up and it blows hot air, but once I start driving again and there is airflow through the driver condenser everything works fine.
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Driver side condenser fan not kicking on
- Thread starter 06Lopez
- Start date
airborne spoon
Active Member
sounds like a relay or fuse has gone out if you can jerry rig it to work off the other side and it works.
full open the fuse box and swap the relays for the left and right if the problem then changes to the opposite side then just buy a new relay they are like 5 bucks at AutoZone.
As far as which one is which you're gonna need to google the fuse box diagram, since you didn't mention which year/model car you have i cant look it up for you but there are a few diagrams out there. on my 2014 P85D looking at a diagram it is the #70 and #71 monster large 40A fuses that controls the L/R condenser fans.
full open the fuse box and swap the relays for the left and right if the problem then changes to the opposite side then just buy a new relay they are like 5 bucks at AutoZone.
As far as which one is which you're gonna need to google the fuse box diagram, since you didn't mention which year/model car you have i cant look it up for you but there are a few diagrams out there. on my 2014 P85D looking at a diagram it is the #70 and #71 monster large 40A fuses that controls the L/R condenser fans.
airborne spoon
Active Member
that is the fuse box crap for cars AFTER 2016 i think even some 2015's have the updated fuse boxes.
Below is the stuff for the earlier models, in my previous post I mention large fuses that is in box #3 fuse# 71 and 72.
As far as the relays i dono which one controls what because no website seems to post info about the relays, however it is very easy to test relays, (Just google something like test automotive relays) and you can buy any one of them at AutoZone for a couple bucks because relays are like fuses and they are not specific to a brand of car.
I would recommend trying all DIY at home options before paying a diag fee from taking the car to tesla.
Also if your fuses are good you can do a super reboot before bothering to check the relays, it fixed my A/C once and it also fixed my power steering another time.
1) unplug car from charge cable
2) roll down drivers window
3) disconnect 12v negative off the battery.
4) disconnect the fireman's loop
5) open driver's door and let car sit for 10-15 min.
6) reverse all last directions for reassembly.
7) road test car and see if the issue is fixed
I have the same problem in a refresh 2016
What did you finally end up finding as the cause?
Finally figured it out. There is a relay K31 located beside the 12v battery that contains relays for both left and right side fan controllers. Replaced the relay and that fixed it
I'm on the same boat with RH fan not running on Nov/Dec 2015 Model S 70D that has the newer fuse box. I can't seem to find the relay. Wiring Diagram shows X564 Connector and its just to the right of the fuse box. Is this where you found the relays?
I think they may have had a typo, it looks like based on the diagram you provided K21 would be your fuse
I have the same issue on a early 2015 MS and it looks like fuse F72 may be the issue on my end. I am going to give it a new fuse and see if that fixes the same issue
For everyone as well, are you experiencing issues with the lower louvre for the front right not closing? I am getting the fan issue but my door is also stuck open
Fuses are F150 and F155 listed in there. Just got to open it up again and can confirm on my Nov 2015 70D K21 listed has the two relays. Oreily's and Autozone did not have it. Really was hoping would put this issue past me
.I would lookup the parts on the parts catalogue under the Tesla service website. They should list it either by K21 for the fuse or something similar
Can look into later if helpful
Tesla may be cheaper to get fuses from, per my experience
Do you think it's wear and tear or is something causing more power to be drawn and thus melting it?
Hotboy408
Member
i think my fan is bad cause draw more current to the relay, it make light screeching sound like a worned bearing.
OrbiterTI4
Member
This won't apply to everyone, since some have swapped the relays and seen the fan work, but don't forget the possibility that a fan may have physically failed. My driver side fan's bearings were loud on shutdown for about three months before finally going out and needing to be replaced.
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