2013 TDI Golf - lost heating

[occxlr8ed]

Back story: heater core pipe was found to be leaking and was replaced at regional VW dealership. Pressure tested to be fine.

Picked up the car last week and noticed the heater no longer works. Still blows cold air just fine, but zero heat. The mrs also notices gurgling sounds when she turns off the car. Temperature gauge still sits on a constant 90c when running.

They have offered to pay for it if the instance it was something they did but at my expense if not, at my local VW which upfront charges $195 for a diagnostic.

Wondering if anyone has guidance on what could cause this, and if it was likely something the "repair" did?

Anyone in VIC that has a VCDS tool i could borrow to scan any codes?

Just would rather take it to my local euro specialist if it's not related, but obviously if it is would take it back to VW.

Thanks!

[Hillbilly]

Probably didnt bleed air out of it properly Take it for a run get it hot, turn heater to hot and sit it in thew garage with top off coolant bottle overnight. If there is air in it you will hear it bubbling quietly

[occxlr8ed]

Tried doing that yesterday, took off the cap and coolant shot out everywhere, almost burnt my hand! Is that normal?

Whilst I had the cap off didn't notice any bubbling, but the level kept going up and down

[Hillbilly]

Was car running I meant when you park it up at night Is there a tap on the heater thats turned off

Going up and down sounds like air park it turn it off and then remove cap till morning.. Never take cap off when running

[occxlr8ed]

Yeah....read somewhere that's how you can self bleed it, cap off whilst the car is running.

Will give it a go

[Hillbilly]

Yeah....read somewhere that's how you can self bleed it, cap off whilst the car is running.

Will give it a go

NO NO you will chuck it all out if you do that park it in garage turn it off take cap off wait till tomorrow to see if level has dropped a little bit

[occxlr8ed]

Dealership think its a blocked heater core.

[gregozedobe]

Could also be the flaps that control whether cold air or hot air is sent to the vents.

If it was working OK before then IMO that is more likely than a blocked heather matrix. Is the silica bag in the coolant bottle still intact ? (when they burst they block the heater matrix).