AC Controller dead?

flyinbrian

@brian_and_the_car
Joined
Apr 17, 2008
Messages
51
Location
Santa Barbara, CA
Hi guys,

Looks like I have the dreaded LX450 a/c controller failure after it became a fishbowl due to leaky sunroof drains or windshield...

Any leads on an affordable replacement?

Denso part 88650-60211

Thx!
 
Joined
Nov 17, 2018
Messages
174
Location
Erie, PA
Have you removed it and opened it up? Its possible that it just needs dried out and cleaned up. A windshield leak will drip on this and cause corrosion.
I drilled a hole in the bottom of the enclosure to keep water from pooling inside. More importantly, I resolved my windshield leak with the FIRETRUCK method.
 

alia176

SILVER Star
Joined
Aug 21, 2003
Messages
13,674
Location
Tijeras, NM
I don't have a LX but am curious what this control box looks like. I assume it's located in the kick panel and get doused with water from clogged sunroof drain hoses? Again, just curious!
 
Joined
Nov 17, 2018
Messages
174
Location
Erie, PA
Its a white housing located above the drivers right knee up under the dash. I suspect a windshield leak causes most of the damage. Its the brains behind the automatic climate control. Its not just for the LX.... the LCs with auto climate also have one. Its officially called the AC Automatic Amplifier....not to be confused with the AC System Amplifier or the AC Amplifier!
 

flyinbrian

@brian_and_the_car
Joined
Apr 17, 2008
Messages
51
Location
Santa Barbara, CA
Have you removed it and opened it up? Its possible that it just needs dried out and cleaned up. A windshield leak will drip on this and cause corrosion.
I drilled a hole in the bottom of the enclosure to keep water from pooling inside. More importantly, I resolved my windshield leak with the FIRETRUCK method.
Yeah, unfortunately I did pull it, cleaned it, hair dried it, the whole 9, still nothing.

It amazes me these are discontinued.
 

flyinbrian

@brian_and_the_car
Joined
Apr 17, 2008
Messages
51
Location
Santa Barbara, CA
I don't have a LX but am curious what this control box looks like. I assume it's located in the kick panel and get doused with water from clogged sunroof drain hoses? Again, just curious!
Yeah, what retlaw says below. From all my research, this is the main failure point and once wet/fried it makes all your hvac buttons stop working.

It's about the size of a cigarettes' box if you can remember what they look like.
 
Joined
Jan 17, 2017
Messages
389
Location
PNW, USA
Are there any other symptoms besides the buttons not working? Yesterday for the first time, I had a hard time pushing the AC button in. Like it was hard/stuck. But it's also the first time I've driven the 80 in 100+ degrees and everything did turn on and (eventually) cool. I didn't know this was a possible failure, haven't looked in that kick panel but Firetruck mod was one of the first things I did a few years ago. Might be time to re-do or just re-install the whole windshield.
 

flyinbrian

@brian_and_the_car
Joined
Apr 17, 2008
Messages
51
Location
Santa Barbara, CA
So it WAS the a/c amplifier under the drivers side. I was able to source one and although expensive, I plugged it in and BOOM! Everything worked again!

Now, to clean sunroof drains and make sure the windshield is sealed. It all started with the a/c amplifier filling up with water after a heavy rain.

Also, I may have sourced a place that refurbishes auto electronics, so I'm going to check with them and see if they can rebuild the original at an affordable rate then I'll at least have a spare!
 
Joined
May 19, 2013
Messages
214
Location
queensland
My LC has auto climate control. i have working fan and vent position buttons but no auto or AC buttons work. Is this AC auto amplifir the likely culprit too.
 

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