Member Since: 01 Aug 2021
Location: Manchester
Posts: 27
Webasto aux heater smoking all the time
My webasto aux heater is smoking all the time along with toxic diesel smell like unburnt diesel
I just had both manifolds replaced due to sudden unforeseen failure warranty company is arguing it is not
Are these connected
10th Feb 2024 12:40 pm
PROFSR G
Member Since: 06 Mar 2017
Location: Lost
Posts: 4658
No, the FBH is very likely clogged with unburnt diesel residues due to short journeys in cold weather, and where it hasn't had a long enough burn time to clear itself.
If you don't have Webasto diagnostics to help sort it, you could try starting the car from cold once the temp is below 8°c. This should command the heater to start and run until the coolant reaches 72°c or thereabouts.
By which time the FBH should have burned off any residues. Lots of smoke is normal for these if they have not been running for a long enough period.yµ (idµ - eAµ) ψ=mψ
10th Feb 2024 3:57 pm
Martin Site Admin and Owner
Member Since: 06 Nov 2004
Location: Hook Norton
Posts: 18456
Check it's not dripping fuel out of the exhaust, if so pull the fuse/disconnect a plug to it to stop it running (fire risk).06 D3 SE / 15 LR D90 XS SW / 88 LR 90 Td5 / 68 BMW 2000 ti
Any issues with the site let me know!
10th Feb 2024 4:07 pm
Tazwu99
Member Since: 01 Aug 2021
Location: Manchester
Posts: 27
Is it normal with this issue to have so much smoke and toxic fumes
I’ve been going up and down motorways at 2 degrees but when I stop the car bellows smoke
10th Feb 2024 4:08 pm
Tazwu99
Member Since: 01 Aug 2021
Location: Manchester
Posts: 27
Martin wrote:
Check it's not dripping fuel out of the exhaust, if so pull the fuse/disconnect a plug to it to stop it running (fire risk).
If I pull the fuse out will it stop it working and if so which fuse do you know
10th Feb 2024 4:09 pm
PROFSR G
Member Since: 06 Mar 2017
Location: Lost
Posts: 4658
Is the smoke coming from the FBH exhaust just inside the passenger front wheel arch?yµ (idµ - eAµ) ψ=mψ
10th Feb 2024 4:11 pm
Tazwu99
Member Since: 01 Aug 2021
Location: Manchester
Posts: 27
Yes it’s coming from the las front wheel arch
10th Feb 2024 4:13 pm
PROFSR G
Member Since: 06 Mar 2017
Location: Lost
Posts: 4658
OK something very wrong there so as it seems to be continuing to burn even after a motorway run. As Martin says pull the fuse (number 28 I think) but it will be on the inside of the fuse box cover beside the battery.yµ (idµ - eAµ) ψ=mψ
10th Feb 2024 4:17 pm
Tazwu99
Member Since: 01 Aug 2021
Location: Manchester
Posts: 27
Thanks
10th Feb 2024 4:29 pm
Tazwu99
Member Since: 01 Aug 2021
Location: Manchester
Posts: 27
PROFSR G wrote:
OK something very wrong there so as it seems to be continuing to burn even after a motorway run. As Martin says pull the fuse (number 28 I think) but it will be on the inside of the fuse box cover beside the battery.
So am I correct now I have pulled fuse 28 that there should not be any smoking and smell?
10th Feb 2024 4:37 pm
PROFSR G
Member Since: 06 Mar 2017
Location: Lost
Posts: 4658
Get it looked at by a LR specialist. It might be a coolant issue (air lock) or faulty temp sensors in the burner. I can't recall what else if anything is on that fuse circuit, but you can always pull the wiring plug from the side of the heater if you need to replace that fuse.yµ (idµ - eAµ) ψ=mψ
10th Feb 2024 4:40 pm
PROFSR G
Member Since: 06 Mar 2017
Location: Lost
Posts: 4658
Tazwu99 wrote:
PROFSR G wrote:
OK something very wrong there so as it seems to be continuing to burn even after a motorway run. As Martin says pull the fuse (number 28 I think) but it will be on the inside of the fuse box cover beside the battery.
So am I correct now I have pulled fuse 28 that there should not be any smoking and smell?
Yes the burner shouldn't operate now.yµ (idµ - eAµ) ψ=mψ
10th Feb 2024 4:41 pm
Tazwu99
Member Since: 01 Aug 2021
Location: Manchester
Posts: 27
Great thanks all for your help it was working when it went in to get the manifolds replaced but smoked since and leaked diesel out of the aux heater exhaust which again didn’t occur before
10th Feb 2024 4:48 pm
Tazwu99
Member Since: 01 Aug 2021
Location: Manchester
Posts: 27
PROFSR G wrote:
Get it looked at by a LR specialist. It might be a coolant issue (air lock) or faulty temp sensors in the burner. I can't recall what else if anything is on that fuse circuit, but you can always pull the wiring plug from the side of the heater if you need to replace that fuse.
I’ve pulled 28 and the fuse box only states it’s for the aux heater
10th Feb 2024 4:49 pm
PROFSR G
Member Since: 06 Mar 2017
Location: Lost
Posts: 4658
Are you saying when the engine was switched off was the burner continuing to run? Or was it just that it was smoking constantly?yµ (idµ - eAµ) ψ=mψ
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