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Discussion Starter · #1 ·
Hi yall!
New member here and first post but I have been reading on here since we bought our car in Feb of this year. This car has been one thing after another since we got it. That being said, the main issue is the one that I’m posting about here. Sorry if this is too long!

Car Details: 2006 VW Jetta TDI 1.9L Automatic- manufactured in 08/2006 so I think that makes it the MK 5.5?

Bought the car in Feb 2022 and it had a coolant leak. We quickly determined that the leak was caused by a major split in the upper heater hose (part number 1K0-122-157-HP) that connects to 1K0-122-291H and that it needed to be replaced. Since our car was manufactured after 07/2006, the actual dual hose set up was a bit pricy so we purchased a gates hose in the correct size for just that side with a 90* bend on one end and hooked it all up.

At the end of April, the leak returned. This time though the coupler (1K0-122-291H) was shattered so we ordered a new one and replaced it. After just 3 days of just moderate driving, the new coupler busted but this time looked melted. We didn’t get an OEM part and just chocked it up to that one being faulty. Once again, after two days of driving this time, it busted again, this time looking more broken than melted and just like the lip of it, rather than at the bend like it busted both previous times.

We’re at a loss. Called our local VW dealer this time to see if they happen to have the coupler and hose in stock so we can go OEM. They didn’t but when I told the parts guy what was up he suggested to test the coolant pressure and said it could have something to do with the radiator or the water pump. We are hoping to be able to do this this weekend and I will post the results here too. We have VCDS and can rent gauges and such if needed. We would love for this car to at least be reliable enough that we can drive it when we need it!

Something else to mention, though I am not sure if it is related or not: the AC in the car also doesn’t work. It blows fine and everything but is not cold despite being charged properly (I think)

Any ideas or suggestions of what could be going on here or what else we need to check or test?

Is it just the fact that we are using aftermarket parts? I would hate to shell out for the OEM parts and it continue happening and ruin those more expensive parts.

What is the normal pressure range for the cooling system? If it is over pressurized, any suggestions for narrowing down the cause of the issue? I have quite a bit of car experience but not so much with this specific issue.

Posting the VCDS Autoscan and a pic of the first and third fitting that busted (didn't get a pic of the second I guess) below. I know it shows more issues than mentioned above but we just haven’t finished recoding it after doing the MFSW retrofit so that should explain some things here. Other things that show malfunction, I have no clue what is causing those yet but they are not the priority at the moment. lol I will put the Advanced Measuring Blocks for the HVAC system in a comment too in case it is related or anyone can give tips on that situation too.

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Thank y'all so much for any help/hints/suggestions y'all can provide!


2 Posts
Discussion Starter · #2 ·
Group 1:
Compressor Shut-Off Code: 0.0
Engine Speed: 800/min
Vehicle Speed: 0.0km/h
Standing Time: 03:06
Group 2:
Compressor Current (actual): This field is blank
Compressor Current (specified): 0.820 A
Compressor Speed: 1000/min
Compressor Load: 4.8 Nm
Group 3:
Refrigerant Pressure: 10 bar
Radiator Fan Activation (actual): 38.8%
Radiator Fan Activation (spec.): 39.2%
Engine Speed Increase: ON
Group 4:
Outside Temp (unfiltered): 32.0*C
Outside Temp (filtered): 32.0*C
Blank Box
Coolant Temperature: 42.0*C
Group 5: Outlet/Footwell Blower Temperature
Outlet Blower Temperature: 35.0*C
Blank Box
Footwell Blower Temperature: 37.0*C
Group 6:
Evaporator Temperature: 33.0*C
Interior Temperature: 37.0*C
Group 7:
Fan/Blower Status: ON
(no units): 3.0
(no units): 1.0
System Voltage (Terminal 30): 14.00V
Group 8:
Status Terminal 15: ON
blank box
Signal Damping: 0.0%
(no units): 2.0
Group 9: Electrical Heaters
Rear Window Heater (actual): Off
Rear Window Heater (specified): Off
PTC Heater (actual): Off
PTC Heater (specified): 0.0
Group 10:
PTC Heater Driver Intention: Off
Heater Off: Off
Parking Heater Condition: Not Installed
(no units): 0.0
Group 11: Fresh Air Recirculating Air Flap
blank box
Specified Value: 100.0
Group 12: Left Temperature Flap
Current Value: 29.0
Specified Value: 32.0
Cold Stop: 32.0
Warm Stop: 221.0
Group 13+:
Error Not Available
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