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I am a proud owner of a 2002 SC430 that I happen to LOVE!! BUT, I am having this issue where my heater will be on then out of nowhere my a/c will start blowing and will not shut off. I have tried hitting all the buttons. I even tried shutting the car off and it still blows. I just noticed the other day while I was driving, i happen to hit s pothole and it came on, it kind of upset me so i revved the engine and all of a sudden it went back to normal. May have been a fluke cause revving the engine has done nothing sence... please help me!!
I am a proud owner of a 2002 SC430 that I happen to LOVE!! BUT, I am having this issue where my heater will be on then out of nowhere my a/c will start blowing and will not shut off. I have tried hitting all the buttons. I even tried shutting the car off and it still blows. I just noticed the other day while I was driving, i happen to hit s pothole and it came on, it kind of upset me so i revved the engine and all of a sudden it went back to normal. May have been a fluke cause revving the engine has done nothing sence... please help me!!
...is it possible that you have it set to "auto" & it's changing from heat to air, to keep the temperature at the desired setting?
I am a proud owner of a 2002 SC430 that I happen to LOVE!! BUT, I am having this issue where my heater will be on then out of nowhere my a/c will start blowing and will not shut off. I have tried hitting all the buttons. I even tried shutting the car off and it still blows. I just noticed the other day while I was driving, i happen to hit s pothole and it came on, it kind of upset me so i revved the engine and all of a sudden it went back to normal. May have been a fluke cause revving the engine has done nothing sence... please help me!!
It stays on high a/c. No matter what setting I put it On. But when it shut off it goes right back to the heat setting I had it on prior. I've tried the auto setting, I've tried every setting there is... when it happens, it will no t shut off. Then it seems like out of nowhere it will start blowing heat again. Now, when it blows cold, its ice cold!! Now as for your suggestion, I litteraly have tried everything...question: is there maybe a relay or hi/lo switch that may be going out??
It stays on high a/c. No matter what setting I put it On. But when it shut off it goes right back to the heat setting I had it on prior. I've tried the auto setting, I've tried every setting there is... when it happens, it will no t shut off. Then it seems like out of nowhere it will start blowing heat again. Now, when it blows cold, its ice cold!! Now as for your suggestion, I litteraly have tried everything...question: is there maybe a relay or hi/lo switch that may be going out??
Do you know if the car has been in a accident? Have you tried checking the harness in back of the ac controls panel to see it they are frayed or disconnected/pinched? You said it wont turn off, so I assume the buttons don't work. If I were you I would start there.
I even tried shutting the car off and it still blows.
I think this is the key to your problem. The HVAC is keyed to the ignition switch. The fact it blows when the car is off makes me wonder if it is a relay, or a short in your blower. You can try swapping out your A/C relay and/or your Blower relay and see if you notice a difference.
If you have access to Techstream, that will aid you in diagnosing the problem faster.
If you have an old computer to put it on, you can buy a copy & Cable from ebay
I think this is the key to your problem. The HVAC is keyed to the ignition switch. The fact it blows when the car is off makes me wonder if it is a relay, or a short in your blower. You can try swapping out your A/C relay and/or your Blower relay and see if you notice a difference.
If you have access to Techstream, that will aid you in diagnosing the problem faster.
If you have an old computer to put it on, you can buy a copy & Cable from ebay
ok, sorry for the confusion but it does not stay on after I turn the car off, it turns off with the car but what I m want was i can shut the car off and when I restart it it will continue to blow high a/c like befor. Again, sorry for the confusion.
ok, sorry for the confusion but it does not stay on after I turn the car off, it turns off with the car but what I m want was i can shut the car off and when I restart it it will continue to blow high a/c like befor. Again, sorry for the confusion.
have you cleaned the HVAC sensor in the dash?
mine was full of lint when I purchased the car.
ok, sorry for the confusion but it does not stay on after I turn the car off, it turns off with the car but what I m want was i can shut the car off and when I restart it it will continue to blow high a/c like befor. Again, sorry for the confusion.
oh, ok...
That makes more sense. Most cars use a resistor to adjust the speed of the blower. Maybe you need a new module for yours. You can buy a used one on ebay: https://www.ebay.com/i/391642916312?chn=ps
12-10-17, 01:34 PM
A/C blowing full blast by itself
