HELP - heater core replacement

[ian.f]

42 minutes ago, Magnet said:

Worth trying Parts in Motion. 
Kind regards,

Gareth. 

Great shout! They had one 👍

[Magnet]

Thanks Ian,

Perhaps you could do us a favour and Like the post and fill in your model and year on the profile. 

[Magnet]

Thanks Ian.

 

[Vytas]

16 hours ago, ian.f said:

So I’ve just spoken to the garage. They’re not able to find anything specifically wrong. They advised that it’s probably a stuck thermostat, or the heater core. 
So I think I’m going to have a go at doing the heater core, as that’s where the majority of the issues seem to get resolved. 

Does anyone have the part number for the core please? I’d like to check before I buy a replacement and strip it all down!

Thanks

 

Here`s what the garage quoted me with part numbers.

[Magnet]

Thanks,

Could you confirm that the coolant temperature gauge reaches 90 within about 3 miles, and holds that reading for the rest of the journey? 
Sorry to point this out, but I guess the above quote will be plus VAT?? 
Kind regards,

Gareth. 

[ian.f]

1 hour ago, Vytas said:

 

Here`s what the garage quoted me with part numbers.

Thanks, that matches my part number also. 
 

22 minutes ago, Magnet said:

Thanks,

Could you confirm that the coolant temperature gauge reaches 90 within about 3 miles, and holds that reading for the rest of the journey? 
Sorry to point this out, but I guess the above quote will be plus VAT?? 
Kind regards,

Gareth. 

From my side, yes. I hit 90 pretty quickly…dependant on ambient temps. Stays at 90 constantly. 
When I did a core flush 6mnths ago, all the pipes were hot enough to the touch as well.

[Vytas]

4 hours ago, Magnet said:

Thanks,

Could you confirm that the coolant temperature gauge reaches 90 within about 3 miles, and holds that reading for the rest of the journey? 
Sorry to point this out, but I guess the above quote will be plus VAT?? 
Kind regards,

Gareth. 

Hi

Yes + VAT. The total was ~950 including the diagnostic 84£ charge.

[ian.f]

Looks like I won’t be sorting it out this weekend 🤦‍♂️

 

[ian.f]

Right, scratching my head now. 
So with a defective part received, I thought I’d dismantle it just to have a dry run. 

Took the car out to do the errands today and it was heating very well. I wouldn’t say hot, but certainly very warm. 

Still took it apart to see what’s going on. With the car running and temps showing 90degrees, both feeder pipes to the heater core were red hot. I couldn’t get to the whole core obviously, but the exposed metal parts were also red hot. 

So I have no idea what’s going on. The only thing I can think of is when the mechanic was investigating he inadvertently fixed it.

I’m going to have the coolant changed this week, hasn’t been done in a couple of years, so I’ll put some flush in it and then get it changed. 

🤷‍♂️

[Vytas]

4 minutes ago, ian.f said:

Right, scratching my head now. 
So with a defective part received, I thought I’d dismantle it just to have a dry run. 

Took the car out to do the errands today and it was heating very well. I wouldn’t say hot, but certainly very warm. 

Still took it apart to see what’s going on. With the car running and temps showing 90degrees, both feeder pipes to the heater core were red hot. I couldn’t get to the whole core obviously, but the exposed metal parts were also red hot. 

So I have no idea what’s going on. The only thing I can think of is when the mechanic was investigating he inadvertently fixed it.

I’m going to have the coolant changed this week, hasn’t been done in a couple of years, so I’ll put some flush in it and then get it changed. 

🤷‍♂️

Yes, the pipes are also hot on mine, but the bottom part of the core was cold to touch, as all the sediments apparently collect there. So the flow is still there it just doesn't get to the bottom part of the radiator.

[cliffcoggin]

1 hour ago, ian.f said:

So I have no idea what’s going on. The only thing I can think of is when the mechanic was investigating he inadvertently fixed it.

More likely he flushed out some sediment or removed some air.

I suggest you reverse flush the matrix alone, i.e. not the whole cooling system, with mains pressure water. You may be lucky to dislodge sediment and limescale enough to get the heating working again.

[squish14]

3 hours ago, ian.f said:

Right, scratching my head now. 
So with a defective part received, I thought I’d dismantle it just to have a dry run. 

Took the car out to do the errands today and it was heating very well. I wouldn’t say hot, but certainly very warm. 

Still took it apart to see what’s going on. With the car running and temps showing 90degrees, both feeder pipes to the heater core were red hot. I couldn’t get to the whole core obviously, but the exposed metal parts were also red hot. 

So I have no idea what’s going on. The only thing I can think of is when the mechanic was investigating he inadvertently fixed it.

I’m going to have the coolant changed this week, hasn’t been done in a couple of years, so I’ll put some flush in it and then get it changed. 

🤷‍♂️

I had the same thing everything was getting hot that I could reach and also had a flush. But none of it sorted the rear heating or it actually getting to "High" temp. After changing the core everything is working

[Sid2020]

Vw golf mk7 /7.5 suffer with blocked heater cores and it’s caused by a additive bag that be built into the coolant  reservoir bottle that bursts and clogs the heater matrix, common fix was to disconnect the 2 coolant pipes that go thru the bulk head and use a power wash in one hose to push the blockage back out the other pipe, takes abit of time but easier and cheaper then replacing the matrix radiator, hope this maybe of help