Varying temperature and fan speed

[SeanR32GtSt]

I got my ac recharged last week and then yesterday I changed out the evap temperature sensor that behind the glove box. Now I get ice cold air conditioning. But sometimes while driving it’ll switch to hot air even though it says the ac is still on. And then go back to cold. Also, the fan would go from full blast to very minimal and then back to full blast again. 
 

attached is a video with it working properly after I put the new sensor In. 
 

 

 

[GTSBoy]

Well, it's either a mechanical/physical problem (say, with the mode door), or the 30 year old electronics are going to f**k.

Edited August 19, 2020 by GTSBoy

[SeanR32GtSt]

Just now, GTSBoy said:

Well, it's either a mechanical/physical problem (say, with the mode door), or the 30 year old electronics are going to f**k.

Ughhhhh I know right. Question now is how to fix it. 

[GTSBoy]

No, the actual question is what is actually wrong. Then you can worry about whether you can fix it. Then you worry about how to fix it.

[SeanR32GtSt]

Just now, GTSBoy said:

No, the actual question is what is actually wrong. Then you can worry about whether you can fix it. Then you worry about how to fix it.

Unfortunately that means going back to the mechanic as I am the newb of the newb with electronics. 

[trel]

Have a read of this thread. Runs through diagnostic on climate control. Try that, might show you a fault.

[SeanR32GtSt]

36 minutes ago, trel said:

Have a read of this thread. Runs through diagnostic on climate control. Try that, might show you a fault.

Oddly enough I’ve done this before. Doing it again just now I got different readings. First diagnostic showed two different numbers. Turned key off. Then did diagnostics again and got a different set of numbers. Attached below is the videos. 
 

 

[trel]

Check those sensors are all plugged in correctly the inside air one is where the little slits are behind the dash cover make sure that's seated correctly too.

[SeanR32GtSt]

1 hour ago, trel said:

Check those sensors are all plugged in correctly the inside air one is where the little slits are behind the dash cover make sure that's seated correctly too.

The outside one is completely missing. Almost like someone ripped it. 

[trel]

There would be your issue. 

[SeanR32GtSt]

13 minutes ago, trel said:

There would be your issue. 

That messes with the air conditioning? I found one that I ordered two weeks ago and it still hasn’t shipped. 

[trel]

It most certainty would affect it. All the sensors work together, if you set your temperature to 20 in the cabin and it's 40 outside that needs to work to regulate how much the compressor has to kick on/off, if it has to blend any warmer air or colder dependant on outside temp etc.

Edited August 19, 2020 by trel

[SeanR32GtSt]

And now the new refigerant temperature sensor I put in Monday is toast according to the diagnostics. Fml. 

[SeanR32GtSt]