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avtech999

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  • First Name
    Huw
  • Location
    HIGH WYCOMBE
  • Audi Model
    A3
  • Audi Year
    2014

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  1. Hey, hopefully you have all solved this by now but having fixed mine in November - it was heater matrix being blocked by the sealant from the header. I replaced the heater matrix and all is well wit hthe world. yeah, A/C was becoming painful to clear the windscreen, lol. I tested the old matrix afterwards and it was completely blocked - both with normal flow and pressure flow. It's a bit tedious as a lot of the interior has to come out, but it works a treat and is a damn lot cheaper than getting the garage to do it!
  2. I recently bought a 14 plate A3 with very high mileage for not much money, the only problem it had was the heating didn't work and apparently no-one could find the solution (someone gave up on it). The problem was the heater matrix was blocked. The heating system in the A3 (certianly the 1.6tdi) contains a sealant in a bag at the bottom of the header tank which bursts when the temperature strays outside the recomended temperature (according to an independant I discussed it with). It is there to prevent a catastrophic loss of coolant if there is a leak and "get you home". the problem is, if it bursts accidentally, it clogs up the collant system and typically finds it's way to the heater matrix where it sits - blocking it. You can check if this is the problem by finding the two pipes which go through the bulkhead and feeling them when the enginge is warm. On my little car, the top one of the two was nice and cosy and the bottom stone cold. when I took the matrix out, it looked imaculate but as soon as the new one was fitted and fluids topped up again properly, the car was right as rain and has been since. I tried flushing fluid through the old one from a tap and with pressure but nothing would go through it. Can't say this is your definitive answer, but it's certainly worth checking! (As a side note, I was quoted £900 for parts and labour but did the job myself for around £90 in parts + half a day of my time). Hope this helps.
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