Core

I wonder what this could be?




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I'm wondering how the car knows the temp isn't comfortable. Take it to a dealer. You could need a thermostat, heater control valve, heater core, or a sensor. Start/stop won't engage unless the coolant's in a certain temperature range. Sounds like the ECU thinks the car is too cold.

The Fed said:

I'm wondering how the car knows the temp isn't comfortable. Take it to a dealer. You could need a thermostat, heater control valve, heater core, or a sensor. Start/stop won't engage unless the coolant's in a certain temperature range. Sounds like the ECU thinks the car is too cold.

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Is there a possibility it will be stored if I scan the car for errors?


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Hi guys

Upon further investigation I’ve noticed:

When the heat is on, and the air is set to push out of the vents or even footwell,

The right side driver vent and the center right vent (and the right side drive footwell) blow out cold air, but the other vents seem to give out full heat!

Even the right side of the windscreen heater is colder than the left side


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You have 2 temperature blend doors, one for each side of the car. The one blowing cold air is stuck or inoperative. If you're in warranty let the dealer fix it. I don't remember if it sets a code but it's not needed since you have the problem. When I have a problem like this I make sure it's doing it when I pull into the dealer and don't shut off the car until at least the service advisor observes it, just in case. If you have VCDS you can do a scan for kicks to see if there's a fault set, just don't do anything else.

The Fed said:

You have 2 temperature blend doors, one for each side of the car. The one blowing cold air is stuck or inoperative. If you're in warranty let the dealer fix it. I don't remember if it sets a code but it's not needed since you have the problem. When I have a problem like this I make sure it's doing it when I pull into the dealer and don't shut off the car until at least the service advisor observes it, just in case. If you have VCDS you can do a scan for kicks to see if there's a fault set, just don't do anything else.

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Thank you very much for the advice, I am not in warranty but have a private warranty,

Heater fan motor
Thermostatically controlled radiator fan motor
Vicious coupling fan
Thermostat
Thermostat housing
Heater matrix
Radiator
Oil cooler
A/C pump

These are covered, on a side note, I contacted a VW specialist and told them the issue and they said they’ve had loads of MK7s in with this issue and it’s the heater matrix that’s failed because its clogged and will need a new expansion tank and flush! They are confident on it. I’ve used them many times and they’re really reliable and never try to rob, so I’m a little confused


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Hi guys, changed the heater matrix, flushed the coolant and took a bag out of the coolant tank that caused this “clog”.

It s now working fine


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