eberhardlorenz45
Seat Altea Diesel Rough Running When Cold
Summary of the thread
A 2011 Seat Altea diesel was experiencing rough running when cold, with an error code indicating an auxiliary heater malfunction and increased fuel consumption. The issue was suspected to be a failing PTC heater, which assists in engine warm-up. After confirming the problem with a professional, the PTC heater was replaced, resolving the rough running and restoring proper heating and fuel efficiency.
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4 comment(s)
eberhardlorenz45 (community.author)
Fuses seem okay. I don't have the exact code to hand, but it mentioned 'auxiliary heater malfunction'. The cold air is only at the beginning, then it gets better. Is it possible to check the heating element myself, or is it too complex?
miaguenther4
That error code confirms it's likely the PTC heater. While you could technically check the heating element for continuity with a multimeter, accessing it can be a pain, often buried deep. Given the symptoms and the error code, it's almost certainly a faulty heating element within the PTC heater unit. Considering the price you mentioned, it's probably the best bet to get it done professionally. You'll regain proper temperature control and fuel economy.
eberhardlorenz45 (community.author)
Cheers for the help. Took it to a garage, they confirmed the PTC heater was shot. Quoted 350€, got it sorted. Heating's back, and it's running much smoother on cold starts now.
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SEAT
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ALTEA
miaguenther4
Sounds like a classic PTC heater failure. The symptoms align perfectly: poor cold starts, fault codes, and increased fuel consumption. These electric heaters assist engine warm-up, especially in diesels. First, have you checked the relevant fuses? A blown fuse is an easy fix. Also, can you read the specific fault code stored? That could give more insight. Is the cold air constantly blowing or only for the first few minutes?