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Heater blowing cool

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Golf457

Passed Driver's Ed
Location
Guilford, UK
The heating in my Golf Mk7 has been a problem since the Winter started five months ago. It’s been into VW four times now and they are still struggling to fix it.
Initially the heater would suddenly blow cold after driving for about an hour. Also the heat was only luke warm. They flushed the heater matrix twice and replaced a flap motor. It’s stopped going completely cold but the max temperature from the blowers was 43 degrees C and VW agreed it should be more like 73.
During my last visit they claim to have replaced the heater matrix and said that it still hasn’t fixed the problem. They said come back in a few weeks while we wait for a new specialist tool to arrive from Europe.
Are they having me on? I’m not convinced they did replace the heater matrix.
Now the weather is warmer and the blowers are now up to 60 degrees. It’s going to be difficult to know if they’ve done anything now it’s blowing hotter. Come next October I expect it’ll be cold again. One thing that still occurs is the heat on the left is about 10-20 degrees warmer than on the right.
Does anyone know what this specialist tool might be?
 
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mickR

Ready to race!
Location
Yorkshire. UK
Sounds like a fob off story to me. If the car is still under warranty I'd take it to another dealership who is not connected to the one it's been to already.
 
D

Deviation01

Go Kart Champion
Location
St. Louis
I had that issue and they had to replace some kind of a sensor.
 
The Fed

The Fed

Old Guys Rule
Location
Florida
Do you have automatic climate control? I believe it will report bad sensors if it's scanned. There's an interior temperature sensor or it's the heater control valve in the heater hose that's probably the problem if they fixed everything else.
 
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Reflex2dr

Ready to race!
Location
Midwest
On mine if you turn the heat on before the car is fully warmed it will never get to operating temp, and it will blow cold. as soon as you tuen the heat off the temp will start to rise again about 10-15 seconds later. Are you experiencing a similar problem?
 
The Fed

The Fed

Old Guys Rule
Location
Florida
Reflex2dr said:
On mine if you turn the heat on before the car is fully warmed it will never get to operating temp, and it will blow cold. as soon as you tuen the heat off the temp will start to rise again about 10-15 seconds later. Are you experiencing a similar problem?
Click to expand...

That doesn't sound right. I leave my HVAC set to 78 and it gets hot unless I turn on the AC.
 
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Reflex2dr

Ready to race!
Location
Midwest
The Fed said:
That doesn't sound right. I leave my HVAC set to 78 and it gets hot unless I turn on the AC.
Click to expand...

the temp needle will literally drop when i turn the heat on and it wont get to operating demo even if you're driving it. Does not happen if I don't use the heat or if its fully warmed.
 
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Golf457

Passed Driver's Ed
Location
Guilford, UK
I don't have climatic control so I'd have thought it would be simple. Would it still have sensors?

I've got VCDS and measured the control knobs, flap positions etc and all look normal; even when the heat suddenly went cold. I took a log reading while driving too and it looked fine. The only temperature sensors I could measure were outside temp and coolant temp.

There are no error codes.

I usually wait for the car to warm up before turning on the heat so I don't get quite so cold.
 
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Golf457

Passed Driver's Ed
Location
Guilford, UK
Hobby55 said:
As said earlier get a second opinion.
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A second opinion would be good. I won't do that yet because I've already paid £100 for VW to diagnose it plus I have RAC warranty and VW have made use of it once (RAC won't pay for diagnosis). Initially I took the car to a local garage and they were reluctant to do it suggesting I try VW's good will gesture as the car was 3.5 years old. It seems this kind of problem is unpopular with garages.
I'll push VW to finish the job and see if they'll guarantee it'll still work come next winter.
 
G

Golf457

Passed Driver's Ed
Location
Guilford, UK
I've just phoned VW for an update on the part they are waiting for. The reception guy said late March before it comes in. I asked what it is. He said he's not sure, it's called a "system flush" and they can't fit the matrix until they have that ready to use. Very mysterious since they've already flushed it twice.
So it turns out they haven't fitted the matrix yet which is a good thing because when they do it should be fixed. They definitely fobbed me off earlier that it had been changed.
Sit back and wait another month.
 
The Fed

The Fed

Old Guys Rule
Location
Florida
Reflex2dr said:
the temp needle will literally drop when i turn the heat on and it wont get to operating demo even if you're driving it. Does not happen if I don't use the heat or if its fully warmed.
Click to expand...

That's not right either. Perhaps your thermostat isn't closing fully. What you're describing is what happens when you take out the thermostat.
 
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