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99 STS
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Discussion Starter #1
I have very nice 1999 STS with 148,000 miles. I have one code B1343-Air Inlet Door Movement Fault. I get cold air from passenger vents but warmer air from driver's side vents. I've read search results for over 3 hours now only to get more confused. I removed glove box and both kick panels. I found 3 actuators. One under driver's side dash. One behind passenger side kick panel. And one behind driver's side kick panel which controls the rear air. I was told by local mechanic with a scanner that there is one (maybe 2?) more located deeper into the dash towards the firewall (called Air Inlet/Outlet Actuator Right and Air Inlet/Outlet Actuator Left) which is causing my problem. Is this true? How many actuators does my 99STS have?
 

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Master of the Dark Art of Diagnostics
2003 DHS - two-2002 DHS, 2003 SLS, 1995 Sedan DeVille, 1989 Coupe DeVille
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19,250 Posts
Re: 1999 Seville STS-Actuator Problem?

I have very nice 1999 STS with 148,000 miles. I have one code B1343-Air Inlet Door Movement Fault. I get cold air from passenger vents but warmer air from driver's side vents. I've read search results for over 3 hours now only to get more confused. I removed glove box and both kick panels. I found 3 actuators. One under driver's side dash. One behind passenger side kick panel. And one behind driver's side kick panel which controls the rear air. I was told by local mechanic with a scanner that there is one (maybe 2?) more located deeper into the dash towards the firewall (called Air Inlet/Outlet Actuator Right and Air Inlet/Outlet Actuator Left) which is causing my problem. Is this true? How many actuators does my 99STS have?
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the Air Inlet Door is the "RECIRCULATE door -
it allows - or restricts outside air
to be mixed with inside "conditioned" air -

there are two "MIX" DOORS -
#1 is the driver side - #2 is the passenger side -
these control the temperature of the air -

there is a "MODE" door -
this controls WHERE the air blows from -

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I get cold air from passenger vents
but warmer air from driver's side vents

if this happens when cold A/C is selected -
most common cause is a slightly low charge of freon -
 

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99 STS
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93 Posts
Discussion Starter #4
I'll check the freon charge today as basscatt suggested. EcSTSatic, is the air inlet door actuator the one on the passenger side? And, after I replace it, will B1343 go off by itself or do I need to remove battery cables or something to reset?
 

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1999 STS - diamond white
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I'm 99.9% sure that's it. It's really hard to get the screws out. The back one in particular. Takes a lot of patience. Once I replaced it, I think I just had to clear the code on the dash controls and it went away for good.
 

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99 STS
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Discussion Starter #6
Thanks EcSTSatic! I know exactly the one you're talking about. It is on the passenger side! And the back screw is definitely hard to get out.

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I'll work on it today and post results tomorrow.
 

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99 STS
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Discussion Starter #7
I had freon charged. Yes, it was low. I'm getting cold air out of every vent now. I changed actuator on passenger side and it's fixed also. B1343 went away. I strongly recommend using a swivel socket to get back screw out. I did some extra exploring while under there to help others out.

B1340-refers to actuator in panel above driver's feet.
B1341-refers to actuator behind driver's side kick plate.
B1343-refers to passenger side actuator (glove box and kick plate removal)

I did this by unplugging each actuator, one at a time, and seeing which code came up.

Thanks for your help guys!
 

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99 STS
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Discussion Starter #9
Disregard reply #7. Wrong info!
B1341-refers to actuator just to the left once you get glove box removed. Easy access.
B1343-refers to passenger side actuator (glove box and kick plate removal). It's sort of hidden in the back right. Hard to access. Takes a little time and patience to remove the 2 screws.

I did this by unplugging each actuator, one at a time, and seeing which code came up.

Thanks for your help guys!
 

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2001 DTS
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I have the mode door problem. Where is it? Blower blowing great just no airflow through vents. Ranger had a thread about this I think but the pics are no longer there . Any help would be appreciated.
 
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