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Joel, Auto technician
Category: Chevy
Satisfied Customers: 1603
Experience:  GM, ASE Certified Technician. Chevy, Buick, Pontiac, Olds. Over 18 Years experience and growing.
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1998 Chevy: pickup..the relay, blower motor, Resistor, and fan switch

Resolved Question:

1998 Chevy S-10 pickup, I have replaced the relay, blower motor, Resistor, and fan switch. Only work on 2&3. Any suggestions?
Submitted: 9 years ago.
Category: Chevy
Expert:  Joel replied 9 years ago.

Hello and welcome.

Just so iam clear. You replaced motor, resistor, and only the fan switch-not the control head?

Customer: replied 9 years ago.
Reply to Joel's Post: did not replace the control head
Expert:  Joel replied 9 years ago.


The 2-3 speeds run from the switch to the resistor. 1 and 4 get power a little different., to switch then to resistor.

You will need to check with a test light for power at the resistor trerminal B (brown) This is low speed with fan switch on low, and mode switch on heat, or vent, etc. If no power at resistor, then need to check for power out of control head with switches in same position at terminal B(brown) on back of contol head. This circuit feeds low speed and high speed fan switch positions through a splice.

If no power ut of control head, the control head is bad. If yes power out f control head, then need to check splice. It is located in the harness behind the control head. Just follow that wires into the harness.

Let me know what you find.

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