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Charles Shaw

Charle ... 2/9/2019

2015 Kia Optima LX 4 Cyl 2.40L

Preventive Maintenance

Heater on work at high

My heater only works only if it's on high what's causing this?

1 Answer


Teddy B

Teddy B 2/10/2019

You will need a Wiring Diagram & Parts Locator, or at least the
Factory Service Manual --- to learn your Heating Systems Blower
Circuit.
Then you can diagnose the issue,should that be a corroded wire,failed
switch or blower motor control module.
Finding & accessing the parts will be the challenge.

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