Mazda CT-L1005, Руководство по обучению

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Diagnosis and Repair Basic Climate Control
Diagnosis on the Heating System
•
The key element in diagnosing the heating system is determining the integrity of the
cooling system. The primary tool to do this is the radiator cap tester in conjunction with
the correct adapter. This will help determine if the cooling system is leaking or not.
NOTE: A coolant mixture with too much ethylene glycol reduces the heat capacity of the
coolant and hence the heating performance of the heater core. See the service
literature for the correct mixture.
Thermostat
•
If the thermostat is stuck open it can cause the coolant to flow only through the ‘big
circuit’. This will result in the engine reaching its operating temperature very slowly, and
less heat being available for the heater core to transfer to the air.
Heater Core
•
A heater core can develop a leak, which could result in a noticeably sweet odour coming
from the air vents.
Curriculum Training 05-10