Bruce Nunnally Posted August 13, 2018 Report Share Posted August 13, 2018 User sent this email: Quote Hey my 02 Cadillac deville runs great i can drive it all day but once i turn the ac on it starts to run hot i replaced about everything but the heater core i just bypassed it can u help me give me a clue i know it not the headgasket at less i dont think so Bruce 2023 Cadillac CT4-V Blackwing Follow me on: Twitter Instagram Youtube Link to comment Share on other sites More sharing options...
barczy01 Posted August 13, 2018 Report Share Posted August 13, 2018 Do both of the cooling fans come on as soon as the AC is switched on? Link to comment Share on other sites More sharing options...
BodybyFisher Posted August 13, 2018 Report Share Posted August 13, 2018 As barczy01 said check the cooling fan operation. Explain what you mean by 'runs hot' What is the outside temp? Have you checked the water pump belt? Have you checked the air purge line that it is clear? 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...
Bruce Nunnally Posted August 13, 2018 Author Report Share Posted August 13, 2018 @Chris Deville this is your topic Bruce 2023 Cadillac CT4-V Blackwing Follow me on: Twitter Instagram Youtube Link to comment Share on other sites More sharing options...
Chris Deville Posted August 13, 2018 Report Share Posted August 13, 2018 1 hour ago, Bruce Nunnally said: @Chris Deville this is your topic I have change nd cleaned the lines nd i replaced everything but the fan nd the heater core i can drive it all day but when i turn the ac on it say nd starts to overheat i turn it off nd it cools right back down while driving the fans come on but it is a little 20 to 30 sec delay but the do run but the fans don't start up once i start the car but they do come on once u turn the ac Link to comment Share on other sites More sharing options...
BodybyFisher Posted August 13, 2018 Report Share Posted August 13, 2018 Please answer my questions above. Lift the hood, AC off, idle the engine, till up to 192 or normal temp. Have someone turn on the AC, watch the fans see if they kick into high. Both fans should run on high Check for codes that may be set and report any P codes here. If you dont know how to check for codes ask, we will tell you how 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...
Chris Deville Posted August 13, 2018 Report Share Posted August 13, 2018 57 minutes ago, BodybyFisher said: Please answer my questions above. Lift the hood, AC off, idle the engine, till up to 192 or normal temp. Have someone turn on the AC, watch the fans see if they kick into high. Both fans should run on high Check for codes that may be set and report any P codes here. If you dont know how to check for codes ask, we will tell you how I knw how to check them do u want the code id or for me to check the part way it tells u current and history And i let it run till it got halfway nd turned the AC on they turned on but not blowing that hard and they was off until i turned the AC on Link to comment Share on other sites More sharing options...
BodybyFisher Posted August 13, 2018 Report Share Posted August 13, 2018 Give me current and history codes ONLY P and B codes 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...
Chris Deville Posted August 14, 2018 Report Share Posted August 14, 2018 if these are the right ones then its alot ABS:c1214current c1221history c1222history c1248history c1277history Amp:B1004 Is these the right ones its alot more like all of them read something but 4 of them have no codes just let me know if i am posting the right thing and i will add the rest Link to comment Share on other sites More sharing options...
BodybyFisher Posted August 14, 2018 Report Share Posted August 14, 2018 Yes, but P and B codes 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...
Chris Deville Posted August 14, 2018 Report Share Posted August 14, 2018 Amp b1009(H) Ddm b1327(h) b3069(h) b3832 (C) Dim P1536 (h) Ipc B1004(h) b1327(h) b1438(h) Ipm b0409(c) b0419(c) b0429(c) b1004(h) b2556(c) b2641(c) Irc-u1000 u1064 u 1065 u 1164 u 1016 No lrd code Pcm-P0230(h) P0410(c) P0463(h) p1571(h) u1040(h) Ddm-B1327(h) B3172(h) u1713(h) u1714(h) b3832(c)u1000(h) RCC-B1009(h) No RFA codes Rim- b1327(h) Sdm-b0028(h) b0029(h) b0030(h) b0040(h) b0041(h) b0058(h) b0059(h) b0064(h) b0065(h) b0066(h) No vtd codes Link to comment Share on other sites More sharing options...
BodybyFisher Posted August 14, 2018 Report Share Posted August 14, 2018 Ok I dont see any fan codes so that is good. Something I asked earlier you earlier you didnt answer. Explain what you mean by getting hot with the AC on, what is the temp? Also what is the outside temp? 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...
BodybyFisher Posted August 14, 2018 Report Share Posted August 14, 2018 Ok I dont see any fan codes so that is good. Something I asked earlier you earlier you didnt answer. Explain what you mean by getting hot with the AC on, what is the temp? Also what is the outside temp? It is possible you think the temp is high when it isn't high, we have seen that before. Do you have an analog gauge or digital gage? 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...
BodybyFisher Posted August 14, 2018 Report Share Posted August 14, 2018 Look this over and monitor your fan operation The PCM will command fan operation when: Low Speed Fan Operation Engine coolant temperature exceeds approximately 106°C (229°F). Transmission fluid temperature exceeds 150°C (302°F). A/C operation is requested. After the vehicle is shut OFF if the coolant temperature at key-off is more than 151°C (304°F) and system voltage was more than 12 volts. The fans will stay ON for approximately 3 minutes. The fans will switch from low to OFF when the coolant drops below 102°C (216°F). High Speed Fan Operation Engine coolant temperature reaches 112°C(234°F). Transmission temperature is more than 151°C (304°F). When certain DTCs set. The fans will switch from high to low (except DTCs set) when the coolant drops below 106°C (229°F). 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...
Chris Deville Posted August 14, 2018 Report Share Posted August 14, 2018 2 hours ago, BodybyFisher said: Ok I dont see any fan codes so that is good. Something I asked earlier you earlier you didnt answer. Explain what you mean by getting hot with the AC on, what is the temp? Also what is the outside temp? It is possible you think the temp is high when it isn't high, we have seen that before. Do you have an analog gauge or digital gage? Digital gage nd it shows the temp goin up on the dash nd right now car says it 85 outside Link to comment Share on other sites More sharing options...
Chris Deville Posted August 14, 2018 Report Share Posted August 14, 2018 2 hours ago, BodybyFisher said: Ok I dont see any fan codes so that is good. Something I asked earlier you earlier you didnt answer. Explain what you mean by getting hot with the AC on, what is the temp? Also what is the outside temp? Which one would be the fan codes to make sure i ant over looked it tryin to get them all Link to comment Share on other sites More sharing options...
Chris Deville Posted August 14, 2018 Report Share Posted August 14, 2018 2 hours ago, BodybyFisher said: Look this over and monitor your fan operation The PCM will command fan operation when: Low Speed Fan Operation Engine coolant temperature exceeds approximately 106°C (229°F). Transmission fluid temperature exceeds 150°C (302°F). A/C operation is requested. After the vehicle is shut OFF if the coolant temperature at key-off is more than 151°C (304°F) and system voltage was more than 12 volts. The fans will stay ON for approximately 3 minutes. The fans will switch from low to OFF when the coolant drops below 102°C (216°F). High Speed Fan Operation Engine coolant temperature reaches 112°C(234°F). Transmission temperature is more than 151°C (304°F). When certain DTCs set. The fans will switch from high to low (except DTCs set) when the coolant drops below 106°C (229°F). Even when the temp gage is up like 2 or 3 lines past half way the fans turn off when i turn car off i replaced relays yesterday still the same Link to comment Share on other sites More sharing options...
BodybyFisher Posted August 14, 2018 Report Share Posted August 14, 2018 20 minutes ago, Chris Deville said: Digital gage nd it shows the temp goin up on the dash nd right now car says it 85 outside Tell me the temp on the digital gage, when you think its hot 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...
Chris Deville Posted August 14, 2018 Report Share Posted August 14, 2018 2 hours ago, BodybyFisher said: Tell me the temp on the digital gage, when you think its hot It dont show the numbers my bad just lines nd it be at half way all day even if i turn ac on and just let it run in park it dont run hot just while i driving wit the AC on it start to go up past half way i let it go up two lines to see if it will go back down but it goes up to 3 lines past half if i dont turn the AC back off Link to comment Share on other sites More sharing options...
BodybyFisher Posted August 14, 2018 Report Share Posted August 14, 2018 Oh, I misunderstood you when you said digital gage. Ok, so I gather that, with the AC on, it can idle all day and stay at 12 o'clock temp, correct? But, once you start driving, the temp rises, 2 to 3 lines? When this happens what are the cooling fans doing?, they should be blazing away on high. 85 degree outside temp. Have you checked the water pump belt? 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...
Chris Deville Posted August 14, 2018 Report Share Posted August 14, 2018 Yes belt is there nd yes they do come on i feel one of them blowing on side of car but the other might or might not be cant really tell nd i change the tstat nd it only took like 1nd halfgallons of water nd half dexcool it ran hot but this time just sitting in one spot but the fans stayed on once i turnes the car off for 2 or 3mins probably not enough water or tstat it did different this time tho the fans ant been stayin on long like that once its off Link to comment Share on other sites More sharing options...
BodybyFisher Posted August 14, 2018 Report Share Posted August 14, 2018 Oh, I misunderstood you when you said digital gage. Ok, so I gather that, with the AC on, it can idle all day and stay at 12 o'clock temp, correct? But, once you start driving, the temp rises, 2 to 3 lines? When this happens what are the cooling fans doing?, they should be blazing away on high. 85 degree outside temp. Have you checked the water pump belt? 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...
BodybyFisher Posted August 14, 2018 Report Share Posted August 14, 2018 1 minute ago, Chris Deville said: Yes belt is there nd yes they do come on i feel one of them blowing on side of car but the other might or might not be cant really tell nd i change the tstat nd it only took like 1nd halfgallons of water nd half dexcool it ran hot but this time just sitting in one spot but the fans stayed on once i turnes the car off for 2 or 3mins probably not enough water or tstat it did different this time tho the fans ant been stayin on long like that once its off Ok, you need to lift the hood next time it runs hot and look behind the radiator and if the engine is hot, those 2 fans should be obviously loud. Is this a sudden overheating problem since you changed the thermostat? 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...
Chris Deville Posted August 14, 2018 Report Share Posted August 14, 2018 Yea it just started back overheating then i change the tstat nd antifreeze nd it ran good for a while then one day just went hot on me everytime i turned ac on Today after i changed the tstat nd let it ran nd it ran hot i let it cool down nd added water the first time nd went round the block twice nd it ran hot wit ac on i cam back parked it nd i put more dexcool in it nd i took the top off the coolant tank nd the two side on it i squeezed them down a lil bit i just droved over 30miles wit the AC on nd no over heating Link to comment Share on other sites More sharing options...
BodybyFisher Posted August 15, 2018 Report Share Posted August 15, 2018 Ok, you need to check to see that the air purge line is clear, if it is clogged air can't get out of the cooling system. This especially become a.problem on a cooling system refill. There is a hose that crosses from the coolant tank to the crossover. It is located near the top of the tank, not the overflow hose, the other 3/8 hose. When the engine is COOL. Remove the clamp if there is one, and gently remove that hose and direct it into a coffee can, have a helper if you can start and idle the engine. A stream of coolant should flow from that hose into the coffee can. If not, the air purge is clogged, let me know the outcome and if its clogged, I'll tell you how to clear 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...
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