sonjaab Posted December 15, 2018 Report Share Posted December 15, 2018 93 Deville 90k one owner fla beauty. The climate control display died. All functions still work. All fuses and relays good. Any ideas to fix or just replace unit? Pics to follow. Quote 93 DeVille-13 Chevy Impala 72 GTO - 77 Triumph Bonneville 84 Z-28 Syracuse NY Link to comment Share on other sites More sharing options...
Bruce Nunnally Posted December 15, 2018 Report Share Posted December 15, 2018 I would try to approach down a diagnostic flow like this: Is the display getting power? Oddly enough this can be rarely be solved by cleaning and reconnecting the battery cable stack -- there are multiple positive cables coming to the battery and one is not getting a good connection. If the control display is getting power then check to see if it is simply turned too dark If it is getting power and it is not commanded off then it may be malfunctioning and needs replacement. Quote Bruce 2023 Cadillac CT4-V Blackwing Follow me on: Twitter Instagram Youtube Link to comment Share on other sites More sharing options...
sonjaab Posted December 15, 2018 Author Report Share Posted December 15, 2018 Bruce , all unit functions work. Just no led display on screen. Just have to guess on settings. Display did work when i got the car but display sorta fizzled out.' Its 25 years old so its expected. All other fuel/speedo displays work. fuses and relays good and checked under dash and hidden also under hood. i figure the led display is shot. Checked with Logan but he dont fix them. Any more ideas before i pull it out and get a replacement? Quote 93 DeVille-13 Chevy Impala 72 GTO - 77 Triumph Bonneville 84 Z-28 Syracuse NY Link to comment Share on other sites More sharing options...
M.Liston Posted December 15, 2018 Report Share Posted December 15, 2018 I have seen this happen before on other vehicles, and sometimes a firm tap on the screen with your finger would get it working. Usually, the problem WILL return. If another tap/poke fixes it, I would go about disassembling the climate screen unit, and reflowing any solder points you see It is fairly rare for the screen itself to actually fail, it is generally the connections that give up. heating and cooling several hundred thousand times does a great job of weakening any and all solder connections. Bruce Nunnally 1 Quote Link to comment Share on other sites More sharing options...
sonjaab Posted December 16, 2018 Author Report Share Posted December 16, 2018 Gonna head to pic a part here in largo and get another one. will replace it when i get home to NY. all the functions work just no led display. So Im lucky on that. Good thing i have a heated garage and plenty o tools. I am just wondering how the face panel is held on.IT looks like its held on by clips. I think a gentle pry on the edge will release it. Anybody know for sure? Quote 93 DeVille-13 Chevy Impala 72 GTO - 77 Triumph Bonneville 84 Z-28 Syracuse NY Link to comment Share on other sites More sharing options...
sonjaab Posted December 16, 2018 Author Report Share Posted December 16, 2018 No luck at the Largo pic a part for a climate control unit. The dash stuff was gone. One cad in the Orlando yard so gonna check it tomorrow. If no good i will check Daytona and the LKQ yards off 95 on my way north. There are a few on flea-bay for over $100. Quote 93 DeVille-13 Chevy Impala 72 GTO - 77 Triumph Bonneville 84 Z-28 Syracuse NY Link to comment Share on other sites More sharing options...
sonjaab Posted January 2, 2019 Author Report Share Posted January 2, 2019 No dice at the parts yards on the trip home. Found one local in ny for $40 bucks so gonna swap it out. Gotta check the pass. side accuator/air mix door operation too as the heat output is weak. Hope its not the heater core but from the posts I see the core is accessed from inside the car so swapping it out will be easy. Flushing it is not a option because its winter here in NY and dont want a ice rink in the garage. A A A A Anew core is only $30 bucks. The only PIA is the heater hose connections in the engine bay. Put 2000 miles on this Deville since I got it and drove it from Fla. to NY with no engine or tranny issues. Much nicer than my old faithful winter rat Buick which is waiting for a new owner. Only 212,000 miles and runs like a watch and started every day buried in the snow. It served me well for 6 years! Will miss the old girl! Hope the Caddy serves me as well! Quote 93 DeVille-13 Chevy Impala 72 GTO - 77 Triumph Bonneville 84 Z-28 Syracuse NY Link to comment Share on other sites More sharing options...
Bruce Nunnally Posted January 2, 2019 Report Share Posted January 2, 2019 gosh, I am not sure why your posts are displaying that way. I fixed the last one by replacing spaces with paragraph returns. Sorry the parts search was not successful. Hate having the heater core out in winter! Quote Bruce 2023 Cadillac CT4-V Blackwing Follow me on: Twitter Instagram Youtube Link to comment Share on other sites More sharing options...
barczy01 Posted January 2, 2019 Report Share Posted January 2, 2019 Your probably going to need a bcm, located behind the glovebox on top of the heater core box Bruce Nunnally 1 Quote Link to comment Share on other sites More sharing options...
sonjaab Posted January 3, 2019 Author Report Share Posted January 3, 2019 Got a new climate control today at a local yard for $35 bucks. Guy sez its tested so I will install it tomorrow. BAR: Hope its not a BCM I think its just the display as it fizzled out on the way home yet all the functions work. Main worry is the weak heat output. Since all 3 hoses are boiling hot at the 3 way "T" I figure the core is not plugged. Gotta take out the glovebox and check the accuator operation and prob. pull the cover over the heater core to to see if its evenly hot across the face. I see other posts of the heater core being plugged in these cars but the hot in and out heater hoses make me think its a bad accuator. But Im lucky this core can be removed easily from behind the glove box ! My Buick core is the same way as I had to replace that one last year. Cold weather like this makes me love my heated garage! Bruce Nunnally 1 Quote 93 DeVille-13 Chevy Impala 72 GTO - 77 Triumph Bonneville 84 Z-28 Syracuse NY Link to comment Share on other sites More sharing options...
sonjaab Posted January 3, 2019 Author Report Share Posted January 3, 2019 Again I will ask how is the panel over the climate control is held in. I guess as it looks to be one full piece covering the climate control/PRNDL display/and fuel guage. I dont see any screws and assume its held in place by clips like the radio surround as I swapped out the dead cassette/am/fm radio for a factory cd/am/fm unit I had on the shelf. Quote 93 DeVille-13 Chevy Impala 72 GTO - 77 Triumph Bonneville 84 Z-28 Syracuse NY Link to comment Share on other sites More sharing options...
rockfangd Posted January 3, 2019 Report Share Posted January 3, 2019 Maybe this is a cell phone. I am not sure if that is possible or how that works but it is kind of confusing. It could be formed like you are thinking. Just a pressed fit into the dash Quote GM FAN FOREVER Nice, clean, luxury= fine automobile Link to comment Share on other sites More sharing options...
sonjaab Posted January 3, 2019 Author Report Share Posted January 3, 2019 (edited) Rock: Using a PC. From pics I see elsewhere there are screw holes on either side near the base of the bezel. Dont wanna bust up that nice dash! So gonna be some heavy disassembly in my future! Anyhoo gonna do the easy glove box removal and check the accuator. If its not operating correctly prob. just disconnect the power arm and peg open the door to HOT! Till I get a new accuator. Just wondering if the climate control being blank causing the temp problem. But I can hear the duct doors operating when i switch from defrost to a/c dash etc. Gotta have HEAT cuz Im freezin! Edited January 3, 2019 by sonjaab Quote 93 DeVille-13 Chevy Impala 72 GTO - 77 Triumph Bonneville 84 Z-28 Syracuse NY Link to comment Share on other sites More sharing options...
rockfangd Posted January 4, 2019 Report Share Posted January 4, 2019 It will cause issues. Likely in limp mode at best. Which unit is the one you want to remove from the dash? The display unit? Quote GM FAN FOREVER Nice, clean, luxury= fine automobile Link to comment Share on other sites More sharing options...
sonjaab Posted January 4, 2019 Author Report Share Posted January 4, 2019 (edited) Rock; Yes i want to remove the climate control unit as it has no display yet all functions work. The fuel center display and operation does work. Prob. gonna do that today. I did pull out the glovebox to check the accuator and temp door operation The accuator works and moves both the temp door and switches to defrost mode so I know that the operation is correct yet the air is only lukewarm while all 3 heater hoses at the "T" are hot. So I figure the heater core is prob. plugged. Since its winter and freezing out flushing the core is gonna be near impossible with the weather its either live with it or swap the core out. I DO have compressed air and wonder if i put air pressure to the core if that would blow out the crud and sediment? Not too bad because access is inside the car and the only PIA is the hose connections. Just gotta figure out how to bull the panel/bezel over the units. Edited January 4, 2019 by sonjaab Quote 93 DeVille-13 Chevy Impala 72 GTO - 77 Triumph Bonneville 84 Z-28 Syracuse NY Link to comment Share on other sites More sharing options...
sonjaab Posted January 4, 2019 Author Report Share Posted January 4, 2019 (edited) Not my pic (my T and hoses still have the factory spring clamps). My accuator /removed glove box and dash pics too large to post here. Edited January 4, 2019 by sonjaab Quote 93 DeVille-13 Chevy Impala 72 GTO - 77 Triumph Bonneville 84 Z-28 Syracuse NY Link to comment Share on other sites More sharing options...
rockfangd Posted January 6, 2019 Report Share Posted January 6, 2019 I usually do not recommend forced air in the coolant hoses. I would attempt to back flush from each side So to be sure here. When coolant is hot. What does each pipe from the heatercore feel like? They should be equally hot. Core is plugged if one side is very hot and other is luke warm. To flush the core I would unhook both sides and flush from the luke warm side. That should back flush it. Once it flows you can flush it both ways. If the core is equally hot on both sides it would be a blend door problem. Quote GM FAN FOREVER Nice, clean, luxury= fine automobile Link to comment Share on other sites More sharing options...
sonjaab Posted January 6, 2019 Author Report Share Posted January 6, 2019 Roc.......All 3 hoses I can reach near the T are equally hot. The accuator and temp door movement brings them both to the stops and defrost when max temp. selected or move to the other stops and flow out the dash when a cooler temp is selected. So Im sorta stumped on a clogged core or a 1/2 way clogged core from other posts I see elsewhere. I prob. will pull the cover off the core and actually feel it for equal temp across the face then go from there. Quote 93 DeVille-13 Chevy Impala 72 GTO - 77 Triumph Bonneville 84 Z-28 Syracuse NY Link to comment Share on other sites More sharing options...
rockfangd Posted January 6, 2019 Report Share Posted January 6, 2019 If both are equally hot then I doubt it is a flow issue. If the actuator is working properly I would suggest checking the blend door itself. Maybe the door that the actuator controls is not moving. Bruce Nunnally 1 Quote GM FAN FOREVER Nice, clean, luxury= fine automobile Link to comment Share on other sites More sharing options...
sonjaab Posted January 7, 2019 Author Report Share Posted January 7, 2019 (edited) Blend door is operating freely from stop to stop. Can see and feel the blend door arm movement with both the accuator attached or it unhooked and manually moving it. Gotta take off the cover to the heater core and feel the complete face of it for constant temp top to bottom. From the posts I see elsewhere its prob half plugged so the heat is weak. Pics too big to post here. Edited January 7, 2019 by sonjaab Quote 93 DeVille-13 Chevy Impala 72 GTO - 77 Triumph Bonneville 84 Z-28 Syracuse NY Link to comment Share on other sites More sharing options...
sonjaab Posted January 7, 2019 Author Report Share Posted January 7, 2019 (edited) Edited January 7, 2019 by sonjaab Quote 93 DeVille-13 Chevy Impala 72 GTO - 77 Triumph Bonneville 84 Z-28 Syracuse NY Link to comment Share on other sites More sharing options...
sonjaab Posted January 7, 2019 Author Report Share Posted January 7, 2019 (edited) Finally resized the pic of what Im posting about and lookin at. Took off metal rod for blend door and it moves freely and moves stop to stop. Im thinkin plugged heater core. Edited January 7, 2019 by sonjaab Quote 93 DeVille-13 Chevy Impala 72 GTO - 77 Triumph Bonneville 84 Z-28 Syracuse NY Link to comment Share on other sites More sharing options...
barczy01 Posted January 7, 2019 Report Share Posted January 7, 2019 Do you lose heat as the car is driving, idling? Do you have heat and then a cold air pocket? Quote Link to comment Share on other sites More sharing options...
sonjaab Posted January 8, 2019 Author Report Share Posted January 8, 2019 (edited) Just lukewarm heat all the time. Burped the cooling system to make sure no air pockets too. Gonna have to either flush the core or replace it. Still gotta swap out the climate control unit. Waitin for my FSM so I can figure out how to remove the face panel aka bezel over the cruise control and fuel center. Edited January 8, 2019 by sonjaab Quote 93 DeVille-13 Chevy Impala 72 GTO - 77 Triumph Bonneville 84 Z-28 Syracuse NY Link to comment Share on other sites More sharing options...
rockfangd Posted January 9, 2019 Report Share Posted January 9, 2019 I would not do anything until you get the display working. I am pretty sure it defaults when there is a problem. And if it does I am not sure what the temp would be. Have you tried manually holding the blend door one way or the other to see if it changes? Quote GM FAN FOREVER Nice, clean, luxury= fine automobile Link to comment Share on other sites More sharing options...
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