hannah_eule59
Seat Toledo auxiliary heater problem
Summary of the thread
A 2005 Seat Toledo owner is experiencing issues with the auxiliary heater, which fails to activate and shows an error code. The suspected cause is a defective glow plug. Another person suggests checking the temperature sensor and coolant level, as these can also affect the heater's operation. Ultimately, the problem is confirmed to be a defective glow plug, which is resolved by a mechanic.
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4 comment(s)
hannah_eule59 (community.author)
Did the temperature sensor throw a specific error code when you scanned yours? Was the coolant leak obvious, or did you need a pressure test?
moritzstar1
The temperature sensor didn't throw a specific code, but it was giving erratic readings. The mechanic suspected it based on the symptoms and live data. The coolant leak wasn't massive, but I was topping it up every few weeks. Get it checked. If you suspect the glow plug, take it to a workshop because those auxiliary heaters can be hard to access.
hannah_eule59 (community.author)
You were spot on. My mechanic found a defective glow plug for the auxiliary heater. The bill was 440€, parts and labor. Thanks for the help.
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SEAT
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TOLEDO
moritzstar1
I had a similar issue last winter. Check the temperature sensor. A faulty sensor can prevent the heater from starting. Also, check your coolant level because a leak can mess with the climate control system and auxiliary heater.