Another webasto question…..

[datsundrew]

Does anyone know if the G263 evaporator sensor has any relevance to the webasto??I’ve read just about everything there is on here about the webast heater and I’m trying to get mine working on the dolphin tdi I bought recently.
I have done a scan on VCDS, and there was a code for an intermittent heater glow plug. I have done output tests for the glow plug, the fuel pump and the fan, all appear to be working and no more codes thrown up as a result. We’ve had frosts over the weekend, so I was up early to try it, Dis showed 3 degrees, so I was hopeful, but nothing happened.
the only code present is the G263, which I will replace, but is it necessary??
aircon and heater are otherwise excellent.

 

[Proghound]

G263 is the outflow temperature sensor behind the dash, that you have to be a contortionist to get to without taking the dash out on a RHD car. I don't think that should make any difference to the Webasto, which relies on the external temperature sensor, the engine coolant temp sensor and the cabin temp sensor in the back of the climate unit.

 

[datsundrew]

G263 is the outflow temperature sensor behind the dash, that you have to be a contortionist to get to without taking the dash out on a RHD car. I don't think that should make any difference to the Webasto, which relies on the external temperature sensor, the engine coolant temp sensor and the cabin temp sensor in the back of the climate unit.

Thanks, I’ve done 2 G263’s so far on different cars this year, and yes it’s not easy lol.
My thoughts were it had nothing to do with the webasto, but worth the ask.
when I tried to fox the air con on the other car in the summer, it didn’t work after replacing the 2 sensors, fan control unit etc, no codes and gave up. 2 days later it decided to work, and working since. Just hoping for same luck with this.

 

[audifan]

Stale diesel is another reason for the Webasto not to work correctly then once cleared its OK. It is a real shame there is no purge facility to flush the fuel feed line. Perhaps there is a need to break into the fuel line manually to pump out the fuel.

 

[datsundrew]

Stale diesel is another reason for the Webasto not to work correctly then once cleared its OK. It is a real shame there is no purge facility to flush the fuel feed line. Perhaps there is a need to break into the fuel line manually to pump out the fuel.

That’s a good point. I can operate the pump on VCDS, so I’ll disconnect the pipe at the webasto and see if I can prime some through. I somehow doubt it is that as although I can operate glow plug, pump and fan individually, when it was frosty at the weekend there was no sign or sound of it even trying to work, it as if it’s being blocked by it’s operating parameters, hence the G263 idea

 

[Deleted member 19621]

When its cold, use VCDS to check Block 16 of the Engine ECU as shown here. https://www.a2oc.net/community/index.php?threads/webasto-gremlins.51018/page-2#post-505357 That will tell you if the webasto is being commanded to start at all. I would guess it is not, but its work ruling out

 

[datsundrew]

An update for you all!
so at the weekend I took the webasto out to have a look at it. I had a working spare which I swapped out.
before swapping I did a scan, 01412…..glow plug implausible signal. I’ve done loads of research and it looks like once the glow plug ignites the diesel and the burner is maintained, the glow plug itself becomes the flame sensor and feeds back info to the ecu to tell it it’s going or not, and if not it shuts down and logs implausible signal.
not the easiest job in the world as it’s quite fiddly, and everything has to go back in the same order as removed, or you’ll be doing it again…..a few times if you are like me!
So, it was in, connected and then I went into output tests, glowplug, dosing pump, then fan, and as before all seemed well. Next I went into ‘test run 022, and I could see the interior light dim slightly (the glow plug), then the pump ticked slowly, then the fan started. I leapt out to feel the webasto exhaust, and it was slightly warm, a slight whiff of diesel and it shut off. Another scan, same code. After repeating this 4 times it started making a different noise, the pump speeded up along with the fan and a huge cloud of smoke……it was alive!!!
after a couple of minutes the smoke cleared, it was sounding quite happy and the heater was working well!!
These little things are awesome. On Sunday morning it fired up without issue, so I think it’s fixed!

 

[Proghound]

Excellent stuff, well done Possibly the initial reluctance was just stale diesel in the feed line?

A working Webasto is a wonderful thing isn't it. I use the A2 in preference to my Volvo when it's cold, because it's just so much easier to defrost when the Webasto is helping you from inside, and then it's nicer to get into afterwards The A2's heated seats on a setting of 3 out of 6 are also at least as warm as the Volvo's on full. The cabin is a lot more comfortable because, while the Volvo does a good imitation of the mouth of a furnace after the first couple of miles, for some reason it does that and only that until it thinks its warm enough, rather than modulating it a bit according to what temperature you've set.

 

[datsundrew]

So…. What’s the difference between the replacement and the original? You’d assume it was the glow plug not working causing the issues, but once in bits it was obvious that the burner chamber was full of carbon build up, especially around the glow plug and the gauze behind it. It looks like the fuel is pumped into the gauze and the glow plug ignites the fuel, and then once red hot and running the glow plug shows less resistance and the ecu shuts the power to the plug. So I’m fairly confident that it’s fixable. Its not easy to get into the burner so I’ve bought another cheap on on eBay to use as bits, and a gasket set. I intend to then use this fixed one to put into ORC, as I know the thermal cut out has gone in that as the scan shows a constant temperature of 124 degrees constantly.
I will add here that I’ve had a slight head start in all this as I have 2 cheap Chinese diesel heaters, one in the garage and one in my Landrover. One has been great, but the one in the garage is very temperamental.

 

[datsundrew]

Excellent stuff, well done Possibly the initial reluctance was just stale diesel in the feed line?

A working Webasto is a wonderful thing isn't it. I use the A2 in preference to my Volvo when it's cold, because it's just so much easier to defrost when the Webasto is helping you from inside, and then it's nicer to get into afterwards The A2's heated seats on a setting of 3 out of 6 are also at least as warm as the Volvo's on full. The cabin is a lot more comfortable because, while the Volvo does a good imitation of the mouth of a furnace after the first couple of miles, for some reason it does that and only that until it thinks its warm enough, rather than modulating it a bit according to what temperature you've set.

Yes, no doubt old fuel, and the fact I’d done so many output tests the exhaust was literally dripping diesel, hence the continued smoke, it was quite impressive!!
this is in the dolphin grey £380 jobbie (Chad) the previous owner said it hadn’t worked for a long time.
Im currently commuting to wales in the silver 05 tdi, ‘help me, I’m poor, poverty spec, which has the electric heater, which to be fair isn’t that bad. I didnt know it had this as I’ve used it on several cold mornings below 6 degrees and it was rubbish, wouldn’t clear the screen etc. Then suddenly driving to work I could smell burning, like being at your Nans in the 70s kind of burning smell, then heat! I pulled over to see what was on fire, and realised it was coming out of the vents. Since then it’s worked well.
Im looking for to driving with the webasto, and no doubt my partner will be fully appreciating it

 

[datsundrew]

like your Nanas Fire….

 

[datsundrew]

From what I’ve researched, it looks like if pin no1 on the webasto is given a live feed, it’ll fire it up. So my next project may be to get a circulation pump that’s fitted to some webasto equipped cars, and then use a remote fob to switch the heater and pump on remotely, so I can switch on 5 mins before heading out into the cold.