dpwct

2003 ES 300

my air conditioner works fine, but in cold climate when the heat is on, it blows cold air. Any thoughts on what this might be and to fix

Arsenii

Hello,

Do you get any heat if you set it to Max Hot?

Here is a thread with the similar issue, which also describes how to enter the Diagnostics mode of the Climate Control, that is what I would start with. If you won't see any codes, go under the hood when the Engine is at the Operating Temperature and feel the Heater Core hoses (here is a Diagram), both should be pretty hot to the touch, if only one is hot but not the other, the Heater Core is jammed, if both are cold, you may have an issue with the Cooling System of the car, like an air bubble stuck in the loop, or a low Antifreeze level.

Hope this helps and best of luck!

dpwct

thank you so much for your thoughtful response I was able to check codes todayCodes

21, 31, 36, 41, 46


not sure exactly what to do with this information. Do you have any suggestions on where to start?

Arsenii

Code 21 is for the Solar Sensor, this code is often triggered when it's too dark outside, and can be safely ignored.

All the rest of the codes, that's quite a unique case, as it appears that Both blend door Servos have malfunctioned, causing the issue you have. It is usually pretty rare for both Servos to fail at the same time, so either one of them has been down for a while without you knowing, or there is something else that prevents them from functioning. Either way, you will likely need to start by inspecting the Servos visually to see if they move at all, maybe take one out and check its Position Sensor, either way the task is to ensure that the Servo is in fact dead. Here is a Parts Catalogue for your car showing the location of the Servos.

Hope this helps and best of luck!

dpwct

Thank you so much for your response. It’s super helpful if the servos need to replaced, is that something that a handy person but not a mechanic can easily do on their own

Arsenii

I mean, if you can see it, it's only a couple of bolts that prevent you from taking it out, hardest part is shoving yourself in there..

Hope this helps and best of luck!

MarkH513

Just wanted to provide a quick update on the AC performance. I realized the other day that I've been driving around in Eco mode, mostly because I like for the transmission to downshift quickly during routine driving. In any event, from some other posts I realized that the AC performance is reduced in eco mode. When I put the car back in normal driving mode I no longer have any issues with the AC and it's blowing nice and cold. I appreciate everyone's input!

dpwct

Is the servo the same part as the actuator are they just two terms for the same same thing

Arsenii

In this context yes, those terms are interchangeable. Sorry for the confusion.