No heat from vents?

Tiny
BHAMDOC1973
  • MEMBER
  • 2014 BMW X5
  • TURBO
  • 2WD
  • AUTOMATIC
  • 157,099 MILES
I replaced this n55 motor. I didn't have to disconnect any of the heater hoses or the hoses at the heat control valve, but of course all the other coolant hoses were removed. I installed everything and all is good. But no heat from air vent.
Image (Click to make bigger)
Thumb
Wednesday, January 1st, 2025 AT 9:38 AM

11 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 54,137 POSTS
If when the other engine went out if they used head gasket sealer it could of clogged up the heater core so I would remove the heater hoses and try a flush, also, these car had a problem with the heater control valve for the heating system so I would check that at it as well, here is the location and a video to help go over failure issues as well.

https://www.youtube.com/watch?v=SNRb6pSwYuU&t

Check out the images (below). Please let us know what happens.
Images (Click to make bigger)
Thumb
Thumb
Was this
answer
helpful?
Yes
No
Wednesday, January 1st, 2025 AT 3:27 PM
Tiny
BHAMDOC1973
  • MEMBER
  • 2,010 POSTS
No the coolant was clean. Only the engine oil looked weird. And I added all fresh coolant. I'll remove the heater control valve and see.
Was this
answer
helpful?
Yes
No
Wednesday, January 1st, 2025 AT 3:50 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 54,137 POSTS
Sounds good, let me know what happens.
Was this
answer
helpful?
Yes
No
Thursday, January 2nd, 2025 AT 10:15 AM
Tiny
BHAMDOC1973
  • MEMBER
  • 2,010 POSTS
I also checked the cap on the coolant expansion tank and found this, do you think it would affect anything?
Image (Click to make bigger)
Thumb
Was this
answer
helpful?
Yes
No
Friday, January 3rd, 2025 AT 10:04 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 54,137 POSTS
Yes, it could make the engine overheat. Are both heater hoses hot when the engine is warm? If not, I would look at the heater core being clogged or the heater control valve. Also, these cars have a water pump just for the heater.
Was this
answer
helpful?
Yes
No
Friday, January 3rd, 2025 AT 11:58 AM
Tiny
BHAMDOC1973
  • MEMBER
  • 2,010 POSTS
Don't think they have a water pump for the heater, I will see what the heater control valve does. The car does not overheat at all. Do you have instructions on the heater core? I think dash may have to come out if so.
Was this
answer
helpful?
Yes
No
Friday, January 3rd, 2025 AT 12:00 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 54,137 POSTS
Yep, the dash will need to come out to fix it, but I would use a garden hose to see if you can unblock it.
Was this
answer
helpful?
Yes
No
Friday, January 3rd, 2025 AT 12:04 PM
Tiny
BHAMDOC1973
  • MEMBER
  • 2,010 POSTS
There are 3 hoses going into the firewall, all 3 I think come from the heater control valve, how would I know which ones to feed water to see if it comes back out from another hose?
Was this
answer
helpful?
Yes
No
Friday, January 3rd, 2025 AT 12:09 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 54,137 POSTS
It looks like all three go to the heater core. So, all of them should be hot. Check out the images (below). Let us know how it goes.
Image (Click to make bigger)
Thumb
Was this
answer
helpful?
Yes
No
Saturday, January 4th, 2025 AT 11:04 AM
Tiny
BHAMDOC1973
  • MEMBER
  • 2,010 POSTS
I swapped the valve control and got some heat after waiting few minutes, ill check it more after I get this vac hose swapped which broke while replacing the control valve.
Was this
answer
helpful?
Yes
No
Monday, January 6th, 2025 AT 11:07 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 54,137 POSTS
Okay, it sounds like you may have fixed it. Time will tell.
Was this
answer
helpful?
Yes
No
Tuesday, January 7th, 2025 AT 10:21 AM

Please login or register to post a reply.

Related Heater Not Working Content

Heater Not Working
VIDEO
Heater Not Working
Instructional repair video
Heater Not Working
GUIDE
Heater Not Working
Step 1 - A heater cannot operate unless the engine is full of coolant/antifreeze. If coolant level is low check the system for leaks.
VIEW MORE