Hello!
I know this has probably been discussed a lot, but, trust me, I hav done loads of research regarding this issue and still do not know where to start off, so pleae do not be harsh on me if this matter has been addressed way too often before me...
So, I got a 2003 Seat Alhambra 1.9TDI (85 kW) Automatic Gearbox.
Guess what? The auxiliary heating of the coolant is not functioning and it is getting cold.
I know I should start off with running computer diagnostics, but here is what I would really want to finally get to know:
Assuming there can be either d5wz vs d5ws installed on my car, what does the system consist of in reality?
A dopsing pump under the fuel tank, yes?
The heating unit iself with the piping under driver's side rear floor.
Then, is there an outside temperature sensor in the engine beay (behing/beneath the window wiper assembly)?
And, Is there another pump (circulation??) located in the engine bay, left side (near to the coolant expansion tank), which keeps buzzing some time after the vehicle ignition is switched off?
I know the units control board may have sustained damage due to temperature changes, and I know that after some consecutive start failures I must clear errors before the unit can start even if it has been repaired, and I know the glow plug is working.
Are there any strainers I would need to inspect for clogging up?
Could anyone please tell me what this system consists of (both models). I like that car, but I want to DIY as much as I can since its not worth spending much money on by bringing it to a shop if I can (possibly) correct the fault myself.
The steering wheel is on the left side if it matters.
You have mentioned all parts it have and it is the same on both models. If im correct your car has model that was not prone to control module problems, pre facelift version. You should start with diagnosis or just check if wiring is intact at heater itself.
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Yes, you've mentioned everything involved with the system.
An 03 won't have the problem with the control board, if the coolant pump in the engine bay is running then its either going to be damage to the wiring loom or the glow plug that needs fixing. Both extremely common!
Father in lae removed the plug and tested by applying the voltage it requires. Said it was good.
The thing is I after ignition is switched off, I can hear some buzzing from the collant expansion tank area where afaik the pump is.
If not for this pump or glow plug, what comes next? Is there not a strainer somewhere that coukd be clogged up?
What about the fan and flame sensor, are they likely to fail on this model?
Really appreciate the help you guys reply fast!
To clarify, he removed the glow plug and tested it?
If the pump and glow plug are both ok then check the wiring from the car, its common for the supply to snap.
There is no strainer or fuel filter, nothing to clog up.
The fan can be tested with VCDS, its known to fail but its not common. I've never seen a flame sensor fail on any of the models.
When father in law applied voltage did the heater run? If so you are looking car side and as Mirez said wiring issue,itââ,¬â,,¢s common for corrosion and wire break at the plug.
The noise you hear is the run in pump running.
He removed the plug and tested. I was not present at the time, but trust him sincr he has been fixing all sorts of stuff on cars for a very long time.
I will try to get the car into our garage this weekend because I want to see the wires myself.
Also, he had once already replaced the pump located in the engine bay for this exact car (the car belonged to him ar first, then to a friend and now it is back in the family).
Will havr a look at it all myself and post an update.
You really need to plug vcds in and see if it has any errors as it will lock out after a certain amount of fail to starts, glow plugs and glow plug screen are other favourites aswell. Trouble is you can visually check wiring etc and if thatââ,¬â,,¢s ok you are still working blind as you donââ,¬â,,¢t know what error could be in the ECU stopping it running.
Would VCDS Lite be sufficient?
P...s. I am also experiening weird beeps (3 equal in a row).
Hard to determine the exact circumstances under which it happens but seems to be moat often when going on lots of bumps (country gravel roads) or turning right rapidly.
No indications on the panel.
Quote from: seatalehandro on November 23, 2017, 09:25:45 AM
Would VCDS Lite be sufficient?
I think the lite version will give codes but not measure blocks or other features like turning fan on etc
Now Iââ,¬â,,¢m sure someone on here (or another forum?) had a similar problem, but also when going over bumps?
Think it turned out to be a battery wire loose or something to do with the assosciated wiring.
Check for fault codes on number 18 module, if you get a message "no response from controller" this is usually because the heater has lost it's power supply which could be number 12 fuse has blown or been removed or the red wire has broken at the heater multiplug (very common)
Thanks for all the replies, nice to see an active forum considering how old the car is.
Still waiting for the garage to free up then I will inspect everything listed here.
P.s. Regarding the three beeps, it first began after my front right ABS sensor died on me (I have to put on winter tyres soon, then I will also replace the ABS sensor), although, it may just be a coincidence.
One one single occasion this (I assume related to these beeps) caused quite an unpleasant situation - I was on a highay, took an exit (pretty sharp and long right turn), and the car (hard to remember in details) suddently acted weird - the speed meter and rps meter spiked, and for a second the car didnt reac to pushign the throttle, then the immobiliser started giving warning beeps (i knew it would stall), so I parked on the side, turned the engine off and on again anf everything was fine.
The only other occasion I experienced something similar was the second the ABS sensor failed on me.
As for battery terminals, I checked them, cleaned them and they are tight, the same goes for that small black terminal box in the engine bay, one terminal needed cleaning.
I am thinking problem with the ABS sensor (I had it diagnosed that front right is the one to blame) could have been related to the aforementioned electrical bugs, but they have not occurred again ina long time.
Have someone had the problem with control module on a 2005 1.9tdi ?
plenty. they tend to overheat and control module dies.