marcthunder9
Tacoma auxiliary heater issue
Summary of the thread
The main issue discussed is an auxiliary heater problem in a 2003 Toyota Tacoma, where the parking heater fails to activate, and an error is stored in the error memory. Initial diagnostics suggest a defective glow plug as a potential cause. A faulty temperature sensor is also considered a possible reason for the heater's failure to activate. The recommended solution is to have the vehicle checked by a certified workshop, which confirmed the defective glow plug as the cause.
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4 comment(s)
marcthunder9 (community.author)
Thank you for your reply. I did verify the coolant level and it appears to be normal, so I don't think I have a coolant leak. Regarding the temperature sensor, could a faulty reading prevent the heater from activating? I am not sure where to find the sensor and how to test it.
florianbecker3
A faulty temperature sensor could definitely cause the system to not activate the heater as a preventative measure. Locating and testing the sensor might require specialized tools and knowledge. Based on your initial diagnosis of a defective glow plug and the added symptom of the parking heater not activating, I would recommend getting it checked out by a certified workshop.
marcthunder9 (community.author)
Understood. Thank you for confirming that the temperature sensor could also be the source of the problem. I have decided to take it to a workshop; they have confirmed that a defective glow plug was the reason why the parking heater could not be activated. They have quoted me 440€ for the repair. Thanks again!
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TOYOTA
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TACOMA
florianbecker3
I am sorry to hear about the issues you are experiencing with your Toyota Tacoma. I understand that the parking heater cannot be activated. Has the coolant level been checked for leaks? I would also recommend that the temperature sensor is checked.