Finished the flushing of the coolant system 3 times today then replaced the heater core. Refilled with VW G13 coolant, burped the system, ran it up to operating temperature and voilà, consistent heat once again.
Nissen is a quality brand. They’re designed that way to produce optimum heat. I think it’ll be a long time before you have to deal with clogging again.
I just had the same symptoms and it was the heater core. 2014 Jetta SE 1.8 TSI with 54K miles. I hope that isn't it for your sake.
Quick update: 12/29/18 Ended up taking apart the heater box and fixing the vents and their pesky foam, and also replacing the old heater core which looked like it was original factory.
Bought a OEM vw core. Not taking a chance on jobber. Seeing I didd the labor myself the job only costed me 160$
Spend the extra couple of bucks and get a Valeo heater core. It is a pain in the butt job but not actually hard.
I found a Febi unit it at a local euro parts dealer that somehow always has the most obscure mk2 parts in stock when I need them. Ill give the Febi a try but if this one fails I'll have to bypass it like a hack.
My buddy bought a Meyle for his MK4 and it unfortunately leaked within a few months and he had to redo the job.
I've had an aftermarket (Mahle/Behr) heater cores explode on me after a year.
They replaced the core in my 2003 Ranger when I bought it. Internet said it was a common problem, and that it was electrolysis. The soloution was to ground the heater core, which I did. Five years later it let go again.
Write your review about heater core
Help others - share your experience with this part.
Voted AGAINST engine oil RAVENOL on the rating page
The brake pads OEM Alfa Romeo got the first review!
The brake caliper OEM BMW got the first review!
The brake pads OEM Infiniti got the first review!
For wiper blades PIAA already 100 reviews.
For battery Energizer already 25 reviews.
In the rating best water pump already 12 brands participate!
In the rating best timing belt already 13 brands participate!
In the rating best head gasket already 3 brands participate!
In the auto rating oil filter for Volkswagen Passat already 5 brands participate!
In the auto rating brake pads for Mazda 5 already 10 brands participate!
In the auto rating tires for Subaru Outback already 50 brands participate!
For cabin filter Fram already 25 reviews.
Voted AGAINST engine oil RED LINE on the rating page
Voted AGAINST engine oil PENNZOIL on the rating page
