Jump to content
CaddyInfo Cadillac Forum

Strange a/c things...


fmw63

Recommended Posts

Hi! The air conditioner on my 93 STS doesn't seem to be putting out a lot of cold air - as in quantity. I checked the air mix door data (set at 60degrees, commanded=84, actual=79), then checked to see if the door was stuck or something. It wasn't. It could close all the way in the position that the controller set it to. When I removed the glove box, there was a funny looking "outlet" of some type laying behind the glove box. It looks almost like a clarinet or sax mouthpiece, with a maybe 3/4" hose connector on the side, two ears on the bottom (or should I call them feet) to clip onto something, and a 2-pin electrical connector on the rear, and the number 3072 on the top. There were no unconnected hoses or connectors that I could find back there. Any ideas, about either?

Link to comment
Share on other sites


That 3/4" connection could be for the aspirator hose. It draws interior air across the in-car temperature sensor. Check AD20 to see the commanded blower speed. Can you hear the blower change speed from LO to HI? It is possible the air inlet at the base of the windshield or the evaporator core is blocked by debris.

___________________________________________________

Link to comment
Share on other sites

What does the temperature sensor look like? I did see one hose about 3/4" connected to something that looked like it had a small white "basket" on the end. Is that it? The extra piece I found doesn't look anything like that one.

The blower does change speeds okay. At Hi, the air coming out the vents doesn't seem to match the sound the blower's making.

I'll look for the air inlet and check that.

Thanks

post-3-1084515559.jpg

Link to comment
Share on other sites

I've never examined one, but the manual indicates the sensor is located to the left of centre, just under the dash pad. The two piece aspirator hose assembly extends to the right and attaches to the aspirator. It sounds like either the airflow is reduced due to a restriction, or the delivery mode is incorrect (e.g. some airflow is being diverted to the floor vents).

___________________________________________________

Link to comment
Share on other sites

Using acdelco.com I found that piece - it IS the inside air temperature sensor. It belongs on the left side somewhere? I found it behind the right side of the glove box, just laying there....?!?!

Link to comment
Share on other sites

How do I find where to plug the sensor back in, without going near the airbag stuff?

"I've never examined one, but the manual indicates the sensor is located to the left of centre, just under the dash pad."

Link to comment
Share on other sites

Here is a tip I have found through this website. If you said that the air does not seem to match the blower speed then you might have a clogged core in the dash. The Daytona dealership said $1200 for this because they had to pull the whole dash out.... wrong... 45 minutes, a tooth brush and a vacuum later and I was fixed.

If you pop the hood and look for the housing for the blower motor, you will notice a 1" by 3" cover plate on the top of the housing that has a sensor in it (either one or two plugs). It has like 4 small bolts holing it down. If you unbolt this panel then you can get at the front side of the core. Use the soft tooth brush to loosen up all the crap, then just vac it out. I sprayed some citrus cleaner in there and washed it up real good. Then vac one last time. Bolt back up, and after that I ran the car for 1/2 hour on high HEAT to get the citrus smell to a more bearable level.. then enjoy.... Total cost... about 30 cents in electricity, 2 cents in cleaner and elbow grease...

The 10 years of crud worked it's way into the system and clogged the core so no air can move through it. Now I just have to find someone who has R-12 in Daytona to charge up the system.

If I find a camera I will try to find a piture of this... till then good luck, MD

Cop didn't see it, I didn't do it!

93 STS 225,000 Miles

99 STS 111,000 Miles

Link to comment
Share on other sites

Found the temp sensor opening. There is one sensor there - the one I found must have been extra or defective. Measured resistance is about 2.5K, don't know what it's supposed to be, though.

About the clogged core, I'l try that.

Thanks to all!

Frank

Link to comment
Share on other sites

Mike, if you can take some photos of what you did it would be very informative. Hell, sure beats $1200 bucks or at least if you DIY, saving the time taking the dash apart.

1994 STS Pearl White 260,000 KM (163,000 miles)

<img src="http://img45.photobucket.com/albums/v137/caesar/caddycaesar.jpg" border="0" class="linked-sig-image" />

Link to comment
Share on other sites

Here is a tip I have found through this website. If you said that the air does not seem to match the blower speed then you might have a clogged core in the dash. The Daytona dealership said $1200 for this because they had to pull the whole dash out.... wrong... 45 minutes, a tooth brush and a vacuum later and I was fixed.

If you pop the hood and look for the housing for the blower motor, you will notice a 1" by 3" cover plate on the top of the housing that has a sensor in it (either one or two plugs). It has like 4 small bolts holing it down. If you unbolt this panel then you can get at the front side of the core. Use the soft tooth brush to loosen up all the crap, then just vac it out. I sprayed some citrus cleaner in there and washed it up real good. Then vac one last time. Bolt back up, and after that I ran the car for 1/2 hour on high HEAT to get the citrus smell to a more bearable level.. then enjoy.... Total cost... about 30 cents in electricity, 2 cents in cleaner and elbow grease...

The 10 years of crud worked it's way into the system and clogged the core so no air can move through it. Now I just have to find someone who has R-12 in Daytona to charge up the system.

If I find a camera I will try to find a piture of this... till then good luck, MD

If the crud is oily, that would seem to indicate a leak in the evaporator core.

Kevin
'93 Fleetwood Brougham
'05 Deville
'04 Deville
2013 Silverado Z71

Link to comment
Share on other sites

What about that area on top of the housing that says "cut here to servive". I have never had the nerve to cut it. I assume it would access the condenser for cleaning. Does the Seville not have this panel?

Link to comment
Share on other sites

Mine is a 93 seville, and has that opening I was talking about.. I'll try to find someone tomorrow with a digital camera to take the picture. The area is not a cut here thing but an actual panel with a sensor mounted to it. Plug on the outside and sensor on the inside of that "air box" It was held on with 4 bolts from a 1/4 drive set... real small... I'll just get some pics... MD

Cop didn't see it, I didn't do it!

93 STS 225,000 Miles

99 STS 111,000 Miles

Link to comment
Share on other sites

OK. I got those pictures now lets see if I know how to post them.. If this does not work then I can send them out via email. Davism4@juno.com Enjoy. MD

post-3-1084889589.jpg

Cop didn't see it, I didn't do it!

93 STS 225,000 Miles

99 STS 111,000 Miles

Link to comment
Share on other sites

OK, that looks like the same area on my car that has the "cut here to service" panel. Mine does not have the sensor located there. Must have been a design change.

Link to comment
Share on other sites

Looking in my manual, part of the A/C problem solving steps is to make sure the aspirator tube is connected and functioning (no kinks). To get to mine, disconnect the negative battery cable, go through a small "trap" door in the rear of the glove box, to un-clip and disconnect the pass air bag. There's about 8 screws hidden by the defroster duct (carefully remove with a thin blade tool, sensors twist out from the bottom) and the three dash A/C vents (carefully remove with a thin blade tool on each end). Remove the screws and the dash pad should come out, to scope out the aspirator/sensor. To get to the mix door linkage, take out the glove box. Maybe yours is similiar...

rek

Link to comment
Share on other sites

Great call MikeD!!

The core was quite clogged up. I was able to brush a lot of gunk out, but since I only had a toothbrush, I'll have to get something a little easier to use to finish the job. Now there's actually a breeze from the vents!

Thanks!!!

Frank

Link to comment
Share on other sites

Frank, Glad I could help... It's funny cause I went into the shop today cause My ac temp is starting to fade.. Well after 196,000 miles on her the compressor is leaking. They said that I should switch to 134 (yuck). So now I have to see if there is a rebuild kit or what a new compressor will run me.. Have you done any of this? I am not looking forward to it.. Maybe the summer wont be hot this year... in Florida... darn... MD

Cop didn't see it, I didn't do it!

93 STS 225,000 Miles

99 STS 111,000 Miles

Link to comment
Share on other sites

Archived

This topic is now archived and is closed to further replies.

  • Recently Browsing   0 members

    • No registered users viewing this page.
×
×
  • Create New...