Can anyone help,,Heat stopped blowing on coldest day of yr
Thread Starter
Junior Member
Joined: Feb 2024
Posts: 33
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2007 GL450
Can anyone help,,Heat stopped blowing on coldest day of yr
the front and rear blower isn’t working. I went into store left the AC button on to allow car to receive warm air while turned off. Came back blower no longer works.?07 gl450.I was about to buy front blower but thought why isn’t rear working then realized rear doesn’t have fan control so maybe I can rig power to it to allow rear to work until I resolve this if someone knows how I can send power to rear can it be done from front blower or a relay-resistor etc. which color wire to send power + to so rear fan will kick on high?I need some heat for the family it’s below freezing in car.
Passenger door side #10 fuse that chart says is for blower had no fuse In it..Must be normal cause it worked fine with no fuse in there adding 1 didn’t do anything anyways. Big #67 fuse in hatch is good.Any other fuse to check?i Cant find any relays or resistors to test and wouldn’t know how. I’d hate to waste time waiting on a blower and it ends up being a resistor or relay.
Vents are working fine you hear them switching and feel hot air seep out.
Thank you guys
Passenger door side #10 fuse that chart says is for blower had no fuse In it..Must be normal cause it worked fine with no fuse in there adding 1 didn’t do anything anyways. Big #67 fuse in hatch is good.Any other fuse to check?i Cant find any relays or resistors to test and wouldn’t know how. I’d hate to waste time waiting on a blower and it ends up being a resistor or relay.
Vents are working fine you hear them switching and feel hot air seep out.
Thank you guys
MBWorld Fanatic!
Joined: Jan 2010
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NGL450 w/EORP, S550
Have you read the car out with an Mbstar scanner? Short test or actuations within chassis I believe will get you to the hvac system specific tests.
If you’ve checked all fuses and you don’t have any water intrusion issues then that is what I would do next.
If you’ve checked all fuses and you don’t have any water intrusion issues then that is what I would do next.
Thread Starter
Junior Member
Joined: Feb 2024
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2007 GL450
Unfortunately I don’t have a MB scanner.I was going to buy something budget wise like a MBII but not sure if that would do much more work then my snap-on Solas.I’m certain it’s a blower or a relay resistor issue.I know where the blower is located but I don’t know where the resistors/relays are located and the forum mentions there’s a odd looking blower fuse under the hood that breaks apart but I can't find that fuse location.
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NGL450 w/EORP, S550
Having such a system within, allow you to actuate either blower motor through the computer interface, and then you can eliminate faults that way. For instance, if you’re able to manually trigger the blower fan during a short test, you know it’s a Sam or ECU issue.
you should really think about investing in a system that can bidirectionally talk to it.
you should really think about investing in a system that can bidirectionally talk to it.
Thread Starter
Junior Member
Joined: Feb 2024
Posts: 33
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2007 GL450
Now I’ve read that the rear heat has its own blower. If it’s isolated from the front blower and can still be turned on to different speeds using front control panel this is probably pointing at something other then front blower being dead Because the back isn't working either.
Idk,it’s penny pinching they installed all this stuff for rear heat/ac but didn’t think that a suv with 3rd row seating needed a separate control panel and the rear passengers are stuck with whatever front passengers put speed on using front panel.I mean even the old fords,caravans etc **** vans got rear controls.
Idk,it’s penny pinching they installed all this stuff for rear heat/ac but didn’t think that a suv with 3rd row seating needed a separate control panel and the rear passengers are stuck with whatever front passengers put speed on using front panel.I mean even the old fords,caravans etc **** vans got rear controls.
Thread Starter
Junior Member
Joined: Feb 2024
Posts: 33
Likes: 1
2007 GL450
Having such a system within, allow you to actuate either blower motor through the computer interface, and then you can eliminate faults that way. For instance, if you’re able to manually trigger the blower fan during a short test, you know it’s a Sam or ECU issue.
you should really think about investing in a system that can bidirectionally talk to it.
you should really think about investing in a system that can bidirectionally talk to it.
The problem now is it is winter and very cold and I have children. I don’t understand why they did not put a separate rear control panel for rear heat. The rear speed must alway be the same as front. So if front heat not working then rear heat not working either.
MBWorld Fanatic!
Joined: Jan 2010
Posts: 3,114
Likes: 782
NGL450 w/EORP, S550
I have a ancient laptop, running a pirate copy of MB star that I bought a decade ago.
It’s clunky and unmanageable, but it works.
There’s a site sponsor here called Benz ninja. I would look at what that service offers.
you can roll a dice with a harbor freight scanner that says it talks to Mercedes, but you really rolling the dice here on what kind of functionality you’ll get.
given your situation, I would go with the remote in option such as Benzninja. It’s not gonna be the cheapest, but it’ll be cheaper than taking this thing to the dealer every time it has an issue like this.
is this the car that you dried out after it had been flooded? If so, some of the electronics you might’ve think were saved might’ve gone bad again. Again, just spitballing here..
It’s clunky and unmanageable, but it works.
There’s a site sponsor here called Benz ninja. I would look at what that service offers.
you can roll a dice with a harbor freight scanner that says it talks to Mercedes, but you really rolling the dice here on what kind of functionality you’ll get.
given your situation, I would go with the remote in option such as Benzninja. It’s not gonna be the cheapest, but it’ll be cheaper than taking this thing to the dealer every time it has an issue like this.
is this the car that you dried out after it had been flooded? If so, some of the electronics you might’ve think were saved might’ve gone bad again. Again, just spitballing here..
Last edited by Max Blast; Dec 15, 2024 at 10:12 PM.
