jw54ish Posted October 23, 2008 Report Share Posted October 23, 2008 heat only comes out right side bottom vent and defrost. driver side lower vent blows very cold air. garage checked all exterior options including flushing and thermostat replace. want $500.00 to pull out dash to maybe locate problem possible vacuum issue. help needed. Link to comment Share on other sites More sharing options...
Ranger Posted October 24, 2008 Report Share Posted October 24, 2008 heat only comes out right side bottom vent and defrost. driver side lower vent blows very cold air. Sure sounds like a clogged heater core. Sediment settles in the bottom and the air is stratified delivering hot air to the passenger and cold air to the driver. Try flushing the core, not the entire system. Link to comment Share on other sites More sharing options...
bk94caddy Posted November 23, 2008 Report Share Posted November 23, 2008 heat only comes out right side bottom vent and defrost. driver side lower vent blows very cold air. Sure sounds like a clogged heater core. Sediment settles in the bottom and the air is stratified delivering hot air to the passenger and cold air to the driver. Try flushing the core, not the entire system. Sorry to re-open this or whatever, but that doesn't always work either. I have been a victim of this in my 94 Deville since I bought it. I've flushed the heater core several times with clr and water, and it works good (like it is supposed to) on the passenger side, but still not satisfactory on drivers side. I am in the process right now, of going out into the cold garage and digging deeper into this problem. This is what I know so far- there is a panel behind that little piece of removable carpet under the center of the dash. That is where the air for the floor (heater vents) comes from. It is warm (not hot) coming out of the passenger side, but when I stick my fingers in the gap between that thin panel and air chamber, it is as cold as the drivers side. And here in WI, it has been around 10-25 degrees Farenheit for about a week now, and that is about the temperature of the drivers side heat. I will post back when I find a fix for this. Link to comment Share on other sites More sharing options...
BodybyFisher Posted November 23, 2008 Report Share Posted November 23, 2008 Check for codes, you might have an actuator problem Pre-1995 - DTC codes OBD1 >> 1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/ Cadillac History & Specifications Year by Year http://www.motorera.com/cadillac/index.htm Link to comment Share on other sites More sharing options...
bk94caddy Posted November 23, 2008 Report Share Posted November 23, 2008 Check for codes, you might have an actuator problem No, no codes. I've been through that. I'm pretty familiar with my car, and have factory service manual, and very well mechanically inclined. My problem is not a non working actuator. The heating/cooling system is doing what it is supposed to do, as far as electrics, and vacuum, and all that goes. I know in my car, the previous owner had heater problems, and they had dealer replace the climate control center, and blower motor (in reverse order), and I'm starting to think they broke something, or did not put back together correctly. I ran diagnostics, and according to that, all doors are doing what they are supposed to do. Link to comment Share on other sites More sharing options...
BodybyFisher Posted November 23, 2008 Report Share Posted November 23, 2008 Check for codes, you might have an actuator problem No, no codes. I've been through that. I'm pretty familiar with my car, and have factory service manual, and very well mechanically inclined. My problem is not a non working actuator. The heating/cooling system is doing what it is supposed to do, as far as electrics, and vacuum, and all that goes. I know in my car, the previous owner had heater problems, and they had dealer replace the climate control center, and blower motor (in reverse order), and I'm starting to think they broke something, or did not put back together correctly. I ran diagnostics, and according to that, all doors are doing what they are supposed to do. Since this is an ongoing problem, consider that you see the actuators moving visually and the doors are cracked or damaged and not shutting and opening and controlling air as they should, then Pre-1995 - DTC codes OBD1 >> 1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/ Cadillac History & Specifications Year by Year http://www.motorera.com/cadillac/index.htm Link to comment Share on other sites More sharing options...
bk94caddy Posted November 24, 2008 Report Share Posted November 24, 2008 I have a question about ducting. My car does NOT have dual climate control, but is there a door in ducting anyway? I pulled glovebox last night, and mix door is working properly. I just don't understand, if mix door is blocking cold side and forcing air through heater core, then where does cold air come from? Link to comment Share on other sites More sharing options...
BodybyFisher Posted November 24, 2008 Report Share Posted November 24, 2008 I have a question about ducting. My car does NOT have dual climate control, but is there a door in ducting anyway? I pulled glovebox last night, and mix door is working properly. I just don't understand, if mix door is blocking cold side and forcing air through heater core, then where does cold air come from? How did you determine that the air mix door is working properly? Visually? Did you try disconnecting the ROD from the actuator and move it manually, from stop to stop? Could the rod be out of adjustment? If it is, it won't close all the way and allow cold air. You will notice threads on the rod to adjust it Pre-1995 - DTC codes OBD1 >> 1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/ Cadillac History & Specifications Year by Year http://www.motorera.com/cadillac/index.htm Link to comment Share on other sites More sharing options...
bk94caddy Posted November 24, 2008 Report Share Posted November 24, 2008 I have a question about ducting. My car does NOT have dual climate control, but is there a door in ducting anyway? I pulled glovebox last night, and mix door is working properly. I just don't understand, if mix door is blocking cold side and forcing air through heater core, then where does cold air come from? How did you determine that the air mix door is working properly? Visually? Did you try disconnecting the ROD from the actuator and move it manually, from stop to stop? Could the rod be out of adjustment? If it is, it won't close all the way and allow cold air. You will notice threads on the rod to adjust it No, rod is not out of adjustment. I removed rod, and moved it manually, and it is working correctly. It is not just on the floor/heater vents either, it does the same thing on defrost or defog. Only hot on passenger side. Link to comment Share on other sites More sharing options...
BodybyFisher Posted November 24, 2008 Report Share Posted November 24, 2008 OK, if you moved it manually, then there HAS to be something wrong with this DOOR itself that you can NOT see. It could be cracked, broken, etc. That could be why no one has been able to figure this problem out. Does everything else seem to work ok, does it move from defrost, to AC vent to floor vents ok? You are going to need to see inside the HVAC unit, to see if that temp door is closing all the way or if its damaged. It sounds like your 94 Deville is similar to my 96 Deville. I had a bad temp actuator and I manually blocked it in August heat to full AC, till I replaced the actuator. It seems to me that if you have manually moved it to full heat, something has to be messed up with that door. The temp actuator ranges from cold to full heat by moving that door, if you are getting cold air, there has to be something going on with that temp door Pre-1995 - DTC codes OBD1 >> 1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/ Cadillac History & Specifications Year by Year http://www.motorera.com/cadillac/index.htm Link to comment Share on other sites More sharing options...
bk94caddy Posted November 25, 2008 Report Share Posted November 25, 2008 OK, if you moved it manually, then there HAS to be something wrong with this DOOR itself that you can NOT see. It could be cracked, broken, etc. That could be why no one has been able to figure this problem out. Does everything else seem to work ok, does it move from defrost, to AC vent to floor vents ok? You are going to need to see inside the HVAC unit, to see if that temp door is closing all the way or if its damaged. It sounds like your 94 Deville is similar to my 96 Deville. I had a bad temp actuator and I manually blocked it in August heat to full AC, till I replaced the actuator. It seems to me that if you have manually moved it to full heat, something has to be messed up with that door. The temp actuator ranges from cold to full heat by moving that door, if you are getting cold air, there has to be something going on with that temp door I don't understand. I should be able to move it from hot to cold by hand. That is with the rod out of it. And, when I do this, the air on passenger side does change. Just the drivers side does not. What I don't understand is where is the cold air coming from??? I would agree with you, except, why would the temperature of the air be different from passenger side to drivers side? If my door was not moving all the way, then I would think that both sides would be warm, or cold, or hot. But that is not the case. Only passenger side is HOT. Drivers side is ice cold, cold as the air outside. Also, I read somewhere that these cars have a 2 part heater core, like split in half? Is this correct? Link to comment Share on other sites More sharing options...
bk94caddy Posted November 29, 2008 Report Share Posted November 29, 2008 UPDATE: Alright, I got it solved. It was the heater core, but flushing it just didn't help. I put a new heater core in today, and it is warmer than ever before. They do split the air from the heater core into two different ducts. When I got it apart, I turned on the heater, and the top of the core was hot, and the bottom blowing ice cold. So, the top of the core is the passenger side, and bottom is drivers side. It is a wonderful 30 degree day in Wisconsin, and I could have it 100 in my car. Yeeeaaaaa Booooyyyyy Link to comment Share on other sites More sharing options...
Ranger Posted November 29, 2008 Report Share Posted November 29, 2008 The bottom of the core was clogged with sediment or sealant tab residue so there was no coolant flow through the lower portion, thus cold air on the bottom. The air gets stratified in the ducts, sending the cold air to the drivers side and hot to the passenger. Link to comment Share on other sites More sharing options...
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