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Golf mk7 / Re: Hot air blowing only from passenger vent issue
« Last post by 2007GTI on Today at 20:48 »Yes, it's a 1 day job to change the heater matrix, VW stealers are taking the pi$$.
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Golf mk7 / Re: Hot air blowing only from passenger vent issue
« Last post by SteveAWOL on Today at 11:25 »Maybe query that they've turned you down under the All-in plan, I've got the same issue and mine is going in on Wednesday to my dealer and all of the work is being covered with the All-in warrantee. They have allocated three days so fingers crossed I'll have it back on Friday although they did initially have it back twice to test and take readings which they submitted before okaying the work.
I’d check the small print in the All In warranty. If you can’t see the heater matrix is excluded then I’d ask the dealer to show you where in the warranty documentation it’s excluded.
Marshalls closed my local dealership (who’d done a few previous repairs under warranty) in the spring, so I had to schlep about 45 minutes to nearest VW branch. I might’ve to trek up to the larger branch in Milton Keynes for a 2nd opinion if it is such a common fault which is typically covered then.
https://m.youtube.com/watch?v=WjvPcXs9muo&pp=ygUXIFZ3IGdvbGYgaGVhdGVyIHByb2JsZW0%3D
Interesting watch and may help with your diagnosis
I was also told it’s a 3 day job by dealership but local independent VW garages seem to think the matrix can be replaced in a day and judging by that video the latter seems realistic.
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Golf mk7 / Re: Hot air blowing only from passenger vent issue
« Last post by SRGTD on Today at 10:34 »Having a similar issue with my GTI whereby the passenger side vents can blow out nice hot air but all those on driver’s side won’t get any more than tepid.
Tried doing the A/C reset trick but that didn’t make any difference.
Took it to dealership who said that heater matrix needs replacing but that wouldn’t be covered by the All-In extended warranty; unlike the thermostat housing which got replaced a few years ago when there was a coolant leak and they removed the dreaded silica bag.
I’d check the small print in the All In warranty. If you can’t see the heater matrix is excluded then I’d ask the dealer to show you where in the warranty documentation it’s excluded.
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Golf mk6 / Re: Any ideas what this could be please?
« Last post by Norwichdaz on Today at 10:12 »Yeh just depends if its.fully sealed unit, as seen on some obviously a little easier if its outside the turbo...looking online for a turbo for it looks pretty sealed i think 
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Golf mk7 / Re: Coolant silicon bag
« Last post by Rudedog on Today at 10:08 »I'm having my matrix replaced next week at my dealers so I'm hoping they will have to drain the whole system which means they'll have to replace with G12 Eco. As I've mentioned I took my bag out within 6 months of buying my car over 5 years ago.
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Golf mk7 / Re: Hot air blowing only from passenger vent issue
« Last post by Rudedog on Today at 10:04 »Maybe query that they've turned you down under the All-in plan, I've got the same issue and mine is going in on Wednesday to my dealer and all of the work is being covered with the All-in warrantee. They have allocated three days so fingers crossed I'll have it back on Friday although they did initially have it back twice to test and take readings which they submitted before okaying the work.
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Golf mk6 / Re: Any ideas what this could be please?
« Last post by Nino on Today at 09:24 »Yeah you could be right to be honest - Only real way to tell is get until the car and see if there is play.
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Golf mk7 / Re: Coolant silicon bag
« Last post by Deddi on 28 November 2025, 22:56 »Thanks for the replies everyone, very useful 👍
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Golf mk7 / Re: Coolant silicon bag
« Last post by MEZZA on 28 November 2025, 22:20 »Just looking at other forums about this issue and came across a silicate cartridge you can get instead of a bag - looks like a small white cylindrical plastic object that goes inside the expansion tank and you can get them for about. £20.00 - supposed to be stronger than a bag but still need changing every few years - unclear as to if you just place it inside the tank or maybe there is specific tank for them - as been mentioned, VW put the bags in to help prolong coolant anti corrosion properties and unless you change to G12 Evo keeping to G13 without the bag could compromise this? Google VW silicate cartridge and you will see them - anybody have more info on this ?
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Golf mk7 / Re: Hot air blowing only from passenger vent issue
« Last post by Redreels on 28 November 2025, 21:16 »https://m.youtube.com/watch?v=WjvPcXs9muo&pp=ygUXIFZ3IGdvbGYgaGVhdGVyIHByb2JsZW0%3D
Interesting watch and may help with your diagnosis
Interesting watch and may help with your diagnosis