MK3 Leon coolant flush advice?

[CardiffFR150]

Hi, I’m looking to flush the coolant system today as my heaters are blowing cold air and I suspect some sort of blockage in the system. Any advice before I let myself loose lol? P.s I have not done this before so kinda ain’t got a clue #Mk3 Seat Leon 1.4 tsi

 

[xyz]

Hi, I’m looking to flush the coolant system today as my heaters are blowing cold air and I suspect some sort of blockage in the system. Any advice before I let myself loose lol? P.s I have not done this before so kinda ain’t got a clue #Mk3 Seat Leon 1.4 tsi

Is there a silica bag in your header tank?


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[xyz]

Probably isn’t if yours is a 1.4. If there’s something on your header tank saying Mit silikat, you should have one!


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[BigJase88]

Uhoh

Check header tank for silicate bag, probably burst, if so new matrix time

 

[CardiffFR150]

Thanks for your replies. No sign of a silicate bag. Car temps are working fine. No loss of coolant. Blowers are cold but occasionally get a slight bit of warmth come through (very very slight). I’ve managed to drain the system by taking the pipe off bottom of the radiator. Flushed through with clean water several times. Now about to refill with 5litres of g13 purple. So far so good lol??

 

[BigJase88]

Thanks for your replies. No sign of a silicate bag. Car temps are working fine. No loss of coolant. Blowers are cold but occasionally get a slight bit of warmth come through (very very slight). I’ve managed to drain the system by taking the pipe off bottom of the radiator. Flushed through with clean water several times. Now about to refill with 5litres of g13 purple. So far so good lol??

Good luck fingers crossed

 

[CardiffFR150]

Good luck fingers crossed

No joy mate. Still blowing cold. I give up it’s off to the garage tomorrow

 

[xyz]

No joy mate. Still blowing cold. I give up it’s off to the garage tomorrow

Would an airlock cause matrix issues? Glad there’s no silica bag because as said further up, they can burst and block the matrix which (on a Golf anyway) ain’t a cheap job!


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[CardiffFR150]

Would an airlock cause matrix issues? Glad there’s no silica bag because as said further up, they can burst and block the matrix which (on a Golf anyway) ain’t a cheap job!


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I got a feeling there’s something definitely clogged somewhere because I’m getting a bit more warm air now (still cold) after that flush. To be totally honest I didn’t really know exactly what I was doing lol so may have cocked it up. Just hope my friendly local garage doesn’t bruise my wallet. Happy new year aye

 

[BigJase88]

I got a feeling there’s something definitely clogged somewhere because I’m getting a bit more warm air now (still cold) after that flush. To be totally honest I didn’t really know exactly what I was doing lol so may have cocked it up. Just hope my friendly local garage doesn’t bruise my wallet. Happy new year aye

Probs be a new Matrix job, crap design on the mk3 leon

 

[CardiffFR150]

Probs be a new Matrix job, crap design on the mk3 leon

Any idea roughly how much that will cost please mate?

 

[BigJase88]

Any idea roughly how much that will cost please mate?

If you take it somewhere private probably £500, main dealer is £1000 job, it’s a dash out job i believe.

or have a go yourself i’m sure some members have managed it on their drive. I wouldn’t fancy it myself though.

seat had my Audi A3 for 2 days to change the matrix.

 

[arossi101]

Probably alot more than than, 2.5 days of work, plus parts, out of warranty thats a major earner for a branch especially when you take the fact its over 100 an hour
Did you get to the bottom of it?

 

[CardiffFR150]

Probably alot more than than, 2.5 days of work, plus parts, out of warranty thats a major earner for a branch especially when you take the fact its over 100 an hour
Did you get to the bottom of it?

Yep. Bought a new matrix from Euro Car Parts and fitted it myself. It’s not a dash out job on the Mk3, it’s very simply accessible via the passenger footwell. Heaters working perfect now. Nice and hot. Took me about 30 mins.

 

[emilyjane2910]

Assume you got all the air out the system after filling back up? Normally have to run engine up to temp and then open the release valve and top up as needed.

 

[CardiffFR150]

Assume you got all the air out the system after filling back up? Normally have to run engine up to temp and then open the release valve and top up as needed.

Yes I ran engine with the expansion cap off and kept topping up until coolant was at normal level

 

[arossi101]

Yep. Bought a new matrix from Euro Car Parts and fitted it myself. It’s not a dash out job on the Mk3, it’s very simply accessible via the passenger footwell. Heaters working perfect now. Nice and hot. Took me about 30 mins.

If only more cars were that easy, I would have avoided that job like the plague as a homer. Did it bleed ok then, last time I done a golf it took ages but I had to run a guided for warranty purposes.

 

[CardiffFR150]

If only more cars were that easy, I would have avoided that job like the plague as a homer. Did it bleed ok then, last time I done a golf it took ages but I had to run a guided for warranty purposes.

Sorry for the late reply. To be honest I think most manufacturers have started to make the matrix more easily accessible. I believe my Leon mk3 has some sort of self bleeding system so I just let it run with the cap off the tank until the coolant leveled itself out. After around 10 minutes my heaters were working spot on


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[Cuprabenwytm]

Take the pipes off the heater matrix in the engine bay and connect a hose pipe to it blast that fucker out

 

[emilyjane2910]

Take the pipes off the heater matrix in the engine bay and connect a hose pipe to it blast that fucker out

De-ionised hose pipe?