A/C not functioning at all

Hello all,

I sincerely apologize if this is a thread somewhere, I’ve seen a few around that are similar but not the same. Also, I’m not an experienced Toyota guy, this is my first one and had it for about two years, I take excellent care of it and is usually garage kept in TX. I use a visor to protect the dash components as well. Practically no repairs but very well maintained and left completely stock except for my camper shell and gun safe. I usually even shut the AC off before shutting it down.

I have a 2016 Doublecab Tundra, SR5, 4x4. Just returned from Iraq for a week only for my moms surgery (my buddy starts and drives it once a week usually). It has 83k miles.

Started it up and noticed the A/C wouldn’t blow. I don’t have a ton of diagnosis time but any pointers to rule things out would be a great start.

Notes: All dash lights are working, clusters and gauges, temp knob lights and blower/vent knob lights work, nothing abnormal on the home screens or ambient air temp sensor indications, everything lights up and works except for the A/C button itself and the air recirculating button. It doesn’t have any sound or significant changes (like a motor trying to work when pressing)…just nothing. The vent on top of the dash was blowing hot air, I presume because the ECU is just allowing the heat from the engine bay go through. Checked a few of the fuses and relays under the dash and in the engine bay, all look good and appear to be good and seated. No changes when I use different options like the lights or anything. There was one day this past summer when the blower just went out for like 10 seconds but never happened again.

Wish I had better verbiage to describe the situation. Electronics kill me so I may need a true Toyota pro on this. Anybody get anything similar? Any fuses or relays specific to re check? I think I checked R13 and 63 under the hood, and the 7.5 ACC and 10A A/C ig fuses under the dash by the e brake. Any pics or diagrams, any ideas or suggestions welcomed. Thanks!

 

I think your blower motor is out. Turn it on high and you should hear the blower motor spinning its located below the glove box on the passenger side.

 

Thanks for the suggestion. Sounds like a realistic diagnosis. I think I just started reading too many threads about other dashboard gremlins and shorts. I still figured the A/C or recirc light would work. Any real way to test it? Any other reason it wouldn’t turn on otherwise?

 

Pull it out, 3 screws if I believe and run leads directly from the battery. Problem is they sometimes intermittently go out. Mine works almost all the time and goes out maybe a handful of times a week.

 

Rgr that, just watched a video on pulling it. Could it be as easy as they made it look!?!? Hahaha. Hopefully I can see if it’s getting juice but you were right, and as I mentioned, zero sound so I may just grab a new one and replace it. Thanks for the wisdom, I may actually be able to get this done before I leave!

 

It is that easy, I pulled mine on my lunch break and tested it and it worked every time on the leads but then started acting up again a week later. I might swap it out and see if that solves it or if the issue is in the wiring somewhere.

 

Replaced the blower motor, zero change. Been checking all the fuses and relays. Any more ideas? It’s hot as hell in my truck since I presume the recirc button is stuck open. The AC button and the recirc buttons don’t work or light up. The climate and vent knobs light up but don’t work either.

 

INext steps I would check related fuses under hood and dash. Check engine bay for any rodent damage to wiring.

 

Damn, I think the next step would be to look at the wiring like described above. Maybe pull the AC unit from the Dash and see if the connection is good.

 

I’ve checked and reseated any A/C and heater related fuses and relays twice. Zero rodent damage noted. Any other related/non specific fuses possibly involved I could’ve missed? It’s super warm in my truck off the dash and it’s a out to rain so I can’t even run any type of A/C. Anyone else experience this issue of the knobs and A/C and recirc buttons not working??

 

I have the 1794 so my controls are digital, maybe your A/C head unit is faulty. Is anything on the head unit lighting up?

 

Everything on the unit lights up except for the A/C and recirc buttons. I cannot figure out what to do next. Other than the dashboard coming off next, Im afraid that’s out my element, I don’t know what else to do.

 

Have a mechanic check and see if there is actually refrigerant in the system first. Also, look for the AC compressor in the engine bay. You can usually hear a "click" when the clutch engages the compressor drive pulley, driven by the fan/serpentine belt. Check those first, and any other fundamentals before doing something as huge as pulling the dash. Maybe you just had a coolant leak.

 

As I’m mentioning, nothing turns on at all. If there were refrigerant I don’t think that would effect my power to the the buttons or knobs. I can only presume it starts with electrical. I can check the compressor at some point when I get power first.

 

OK.. How about this. When you replaced the blower motor, you probably disconnected power and ground wires to the old unit, and attached them to the new one when you installed it. If you or a friend has a voltmeter, check the voltage drop across the leads, make sure it's actually receiving power when you hit the AC switch. If so, your replacement motor could even be bad. If not, you have some electrical malfunction somewhere. The AC switch could be going out, but it's unlikely after relatively little use. If you're not getting power, then there's a chance an electrical connection is coming loose somewhere.

Hope this helps you out

 

Any faults in the HVAC control unit?