So...I haven't had AC in the car. I took the car this morning to an AC specialist in my area. He redid some wiring on my compressor since it is off of a 1997 with my original 92 manifold/plate.

He started filling it with R134a, since it was previously converted, and the compressor started turning. However, it only works for a second and then shuts off and on and off and on, and so on.

Now, up near the top left portion of the passenger side of the car close to the fire wall, there is a small canister device with a few vaccuum lines coming out of it. There is this bulbous like can that is plugging one of the orifices where there is some air escaping. Plug that hole with your finger and the hissing stops.

Is that the heater control valve?


Anyway, I did the self diagnostic check on the climate control. it shows a code 41 flashing. Previously it only showed code 23 which I read was low freon.


The code 41, per the picture posted in the ONE thread that came up on my search, says something like AIR SERVOMOTOR CIRCUIT. Something like that.

What is code 41 and what do I need to do to fix it?

Remember, the compressor does kick on and then off repeatedly.

All help is appreciated.

 

Found some more stuff but I don't understand it. I need clarification.

I see something about a blend door or servometer.


Am I in for a big expense to fix this thing? I'm almost better off selling the car if this is going to be mucho dinero that I do not have.

 

 

And code 41 is when you have the in diagnostic mode in FRESH AIR button only.

When you push recirculated air in diagnostic mode, it flashes codes 20-27.


I need serious help.

 

Yeah thanks for the chart but I don't understand how to read those.

Can anyone provide me with a plain English explanation on whats going on with my A/C?

I have an appointment set up Tuesday morning at the dealership to perform a diagnostic check on the A/C system in case no one feels like/can help me.

 

Seriously....no one can offer help but posting a picture? Come on

 

In plain english your car is telling you that your air mix servomotor is probably jacked. That means it can not switch between warm and hot air. If you enter the stepped mode ACTUATOR check and can read the english from the pages I posted you can begin a simple diagnosis.
Begin the stepped actuator check and refer to the chart in inspection procedure step 1- when you are in actuator check code 20,21 or 22 you should feel cool air coming out but only on check 22 will the AC kick on, in which case you should feel colder air. Now go to code 23 and 24-you should be in mixed temp mode with the AC still on. Codes 25,26, and 27 should deliver hot air with the AC still on. Your car needs to be warmed up to do this and you need to stay in each step for maybe 10 seconds or so to allow the temp to change. Step 1 complete. Now, if you don't get the desired results then you need to actually check the servomotor by applying 12 volts to it as indicated in step 2. If the servomotor does not move likes it's supposed to then you need to figure out why its not working or shell out $120+ dollars for a new one and hope it works. See below for everything that goes on in each step of the actuator check. Hope this helps.

 

Well I hit recirc in the diagnostic mode and there was no cold air. It stays the same temp as it is outside.

Shows 21-27 in recirc mode. Whats that mean?

Compressor will kick on and off while the A/C button is on and the car is running.

 

step 1: Start car with the AC in the diagnostic check mode and let the car warm up for 5-10 minutes
step 2: When you enter the diagnostic check mode you will automatically be in the sensor check mode, you need to hit the recirc button to enter the actuator check mode - you already know this
Step 3: Hit the fresh air button to enter the stepped operation. This will allow you to check each individual code 20-27 for as long as you want. When the vehicle checks it automatically it just races through the codes and does not give you enough time to check every condition listed in the chart I posted. For example, when code 23 is displayed is the blower at level 2, with the air coming out of the vents, the recirc button lit and the AC on?
Step 4: To move to the next code hit the fresh air button again. Every time you hit the button it will move to the next code check. You can dwell at each code for as long as you want to give the system time to reach the temp that corresponds to the code being checked.

 

Okay I understand that now.

So I can start the car in the diagnostic mode. Before I would just have it on ACC and check. In ACC diag mode it automatically displays the fresh air button...you have to push the recirc button to race through the 20-27 codes.

Its different for while the car is running?


After I do this check what am I looking for? It should fix the problem?


what if my vac lines are messed up? When I did the tune up I don't think I put them back together properly.

I'm not sure if they are correct on the HCV. Last year it wouldn't automatically heat up, so I switched around some of the hoses on the HCV and heat finally came out.

If the stepped check does not work its probably the whole servomotor?

 

I tried with the car on and its the same thing. I'm just going to take it to Lexus and pay the $95 to have them tell me what it is.

This is too complicated.

 

Yeah, it sounds like your servomotor is not responding for whatever reason. You should check it by applying voltage as the manual says. The lexus dealer is probably going to tell you what you already know for $95. Hopefully the tech will be experienced and tell you right away what is really wrong besides "code 41, the air mix servomotor". You should report what you find out.

 

I decided to cancel my service check at Lexus today.

Anyone have any ideas?

Is it worth trying to get a blend door servomotor thing from the local junk yard?

 

It will be worth it if yours is actually broken and the used one is functional and cheap.
You need to test yours first before you start throwing parts at the car.