A/C BLOWS hot air ONLY when windshield defrost in use
07-22-2023, 08:15 AM
#1
New Members
Thread Starter
Join Date: Jul 2020
Location: Florida
Posts: 27
Received 0 Likes
on
0 Posts
My Ride: E 60 5 series BMW
Model Year: 2007
Engine: N52
A/C BLOWS hot air ONLY when windshield defrost in use
HELP PLEASE IM leaving in florida and rain every day , a/c is full charge to expec,
As soon the FRONT windshield defrost is pushed
blows hot air .
super annoying with 100*F ,
please can anyone give me some advice
As soon the FRONT windshield defrost is pushed
blows hot air .
super annoying with 100*F ,
please can anyone give me some advice
Last edited by Bmw4u; 07-24-2023 at 06:43 AM.
07-22-2023, 10:29 AM
#2
Super Moderator
Join Date: Jul 2011
Location: Augusta, GA
Posts: 3,543
Likes: 0
Received 300 Likes
on
287 Posts
My Ride: 05 530i M54
Model Year: 05 530i
Engine: 3.0 M54
Check heater valve at operating temp by feeling the hoses going towards the firewall if hot then it needs to be changed.
The following users liked this post:
Bmw4u (07-24-2023)
07-24-2023, 07:52 AM
#3
New Members
Thread Starter
Join Date: Jul 2020
Location: Florida
Posts: 27
Received 0 Likes
on
0 Posts
My Ride: E 60 5 series BMW
Model Year: 2007
Engine: N52
Thank you , is not hot
one thing to be clear,
The hot air only only blowing hot fron the front windshield , no the other vents,
a/c is fighting to compensate for the heat from the defrost,
and they said all BMW , do not have a option , to change the hot air
I find that wrong , my others cars , all blows cold air if the a/c is on , NOT HOT FROM THE DEFROST , is so anointing
one thing to be clear,
The hot air only only blowing hot fron the front windshield , no the other vents,
a/c is fighting to compensate for the heat from the defrost,
and they said all BMW , do not have a option , to change the hot air
I find that wrong , my others cars , all blows cold air if the a/c is on , NOT HOT FROM THE DEFROST , is so anointing
07-24-2023, 08:06 AM
#4
Super Moderator
Join Date: Jul 2011
Location: Augusta, GA
Posts: 3,543
Likes: 0
Received 300 Likes
on
287 Posts
My Ride: 05 530i M54
Model Year: 05 530i
Engine: 3.0 M54
The only things it can be is:
1. Low on Freon (leak in system)
2. Defrost actuator not working correctly
3. IDrive is not set all the way to cold
4. Heater valve (highly likely if it's original)
Your a/c should be blowing cold. The only time my a/c did what you're describing was due to the heater valve. Once I replaced it everything worked as it should. I knew mine was bad because the hoses coming out of it was not cool at all
1. Low on Freon (leak in system)
2. Defrost actuator not working correctly
3. IDrive is not set all the way to cold
4. Heater valve (highly likely if it's original)
Your a/c should be blowing cold. The only time my a/c did what you're describing was due to the heater valve. Once I replaced it everything worked as it should. I knew mine was bad because the hoses coming out of it was not cool at all
07-24-2023, 08:15 AM
#5
New Members
Thread Starter
Join Date: Jul 2020
Location: Florida
Posts: 27
Received 0 Likes
on
0 Posts
My Ride: E 60 5 series BMW
Model Year: 2007
Engine: N52
The only things it can be is:
1. Low on Freon (leak in system)
2. Defrost actuator not working correctly
3. IDrive is not set all the way to cold
4. Heater valve (highly likely if it's original)
Your a/c should be blowing cold. The only time my a/c did what you're describing was due to the heater valve. Once I replaced it everything worked as it should. I knew mine was bad because the hoses coming out of it was not cool at all
1. Low on Freon (leak in system)
2. Defrost actuator not working correctly
3. IDrive is not set all the way to cold
4. Heater valve (highly likely if it's original)
Your a/c should be blowing cold. The only time my a/c did what you're describing was due to the heater valve. Once I replaced it everything worked as it should. I knew mine was bad because the hoses coming out of it was not cool at all
now i do a leak in the shafts of the a/c , very small , for that i evacuated all freon and vacuun , fill to espec ,
do you think that is why the houses from the heater valve are not hot , and why blows super hot air from the from windshield ?
07-24-2023, 08:55 AM
#6
Members
Senior Members
Just change the heater valve anyway. It is old, there are diaphragm seals inside. If it isn't bad now, it will be. It is pretty easy to change and when I did mine, not much coolant even leaked out. Hardest part are the clamps and if you have the tool, they are easy -- $15 Amazon.
The following users liked this post:
Bmw4u (07-25-2023)
Thread
Thread Starter
Forum
Replies
Last Post