Need help...heater dont work...code 21, 24
01-24-08, 11:08 PM
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Need help...heater dont work...code 21, 24
I have a 96 Ls 400 and the heater dont work at all even when its all the way max hot....I tryed max cold all the way up to max hot one notch at a time and still no heat.....a/c works fine tho......I also ran the code by holding auto clilmate control and cycled together and code 21, 24 came up on the screen.....can anybody help me fix this or see what these two code mean......
Thankyou very much
Thankyou very much
01-25-08, 09:47 AM
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PureDrifer thanks - I check the cooling system and the water level was way below the mark so I added water to the full line and stared the motor up and let it warmed up first then turn on the heat and still no sign of heat coming out only blows out cold air......can anybody help me out with these two code 21, 24 or how to fixed this problem......
thankyou very much
thankyou very much
01-25-08, 06:09 PM
#5
you have to BLEED the system.
theres prolly air in the cooling system keeping water from circulating properly so fill the overflow to its neck with distilled water then start the motor with the coolant cap OPEN (make sure to do this with a COLD motor) and the heater settings to max hot and high (this opens the thermostat).
let it idle for ~10mins adding water as the level decreases.
here are the two codes, search on the solutions.
21Main O2S & Heater Signal
24 IAT Sensor Signal
theres prolly air in the cooling system keeping water from circulating properly so fill the overflow to its neck with distilled water then start the motor with the coolant cap OPEN (make sure to do this with a COLD motor) and the heater settings to max hot and high (this opens the thermostat).
let it idle for ~10mins adding water as the level decreases.
here are the two codes, search on the solutions.
21Main O2S & Heater Signal
24 IAT Sensor Signal
01-26-08, 06:56 PM
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PureDrifter thanks again....I tryed what you told me and its still the same....could it be the two code that is not giving signal to the heater motor....how do I find or locate the code 21 - Main O2s & Heater Signal and the 24 - IAT Sensor Signal, maybe those two sensor need to bee change.....let me know if im wrong or on how to fix this problem.....thankyou very much
help plz
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