Heater fan does not work

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I've replaced the eatc computer control head, I've replaced the thermostat, I've replaced the heater fan motor, I have changed the pigtail to the heater fan motor, and checked all fuses and relays. Wtf!

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in New Baltimore MI

Dec 11, 2020

2 Replies

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Popular Answer

pushrodon Dec 11, 2020

Have qualified personnel TEST all fuses - there are multiple HVAC fuses which are in cabin AND under hood. You just think you’re checked the fuses !

pushrodon Dec 11, 2020

Using a 12 lot test light - this testing will take about 8 minutes .. Good luck with!

pushrodon Dec 12, 2020

Yes - absolutely keep in mind the blower resistor module in center of firewall under hood - I was under the impression you had already replaced that - I misread your post - that is the # 1 suspect as this point. However it is still worthwhile to TEST ALL FUSES anytime an electrical problem occurs - it is one of the more beneficial and simplest test a DIYer can quickly perform.

DaveJMon Dec 12, 2020

Don't guess -- follow Pushrod's advice, as you've already replaced far more things than needed. The blower speed controller is suspect on these automatic temperature controlled systems. It is located under the hood at the firewall.

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Tuffy Tire & Auto Service Center - Grandview

4.7

(89)

2.39 mi

1524 W 5th Ave

Columbus, OH

Closed

Opens 8:00 AM Mon

Call

Excite Auto Repair & Towing

4.4

(15)

5.94 mi

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Closed

Opens 9:00 AM Mon

Call

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(42)

6.56 mi

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Closed

Opens 8:00 AM Mon

Call

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(531)

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Closed

Opens 7:30 AM Mon

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Closed

Opens 9:00 AM Mon

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Tuffy Tire & Auto Service Center - Grandview

Excite Auto Repair & Towing

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Tuffy Tire & Auto Service - Grove City

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Boyd's Tire & Service - Columbus

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Excite Auto Repair & Towing

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Tuffy Tire & Auto Service - Grove City

Blackstone Complete Auto Care

Boyd's Tire & Service - Columbus

Tuffy Tire & Auto Service Center - Grandview

Excite Auto Repair & Towing

All In Auto Service