Climate Control Module 599-215?

JUWANSAYLES

MEMBER
2001 CHEVROLET TAHOE
5.3L
V8
2WD
AUTOMATIC
300,000 MILES

The vehicle listed above is an LT.
Auto HVAC system
A/C Control Module 599-215 is the climate control part number
I have recently replaced my blower fan, and fan resistor twice
It all started when I bought the new climate control module and plugged it in but was immediately met with strong air coming from the car vents, even when turned off. So I unplugged and did some researching, and everyone said replace your blower fan resistor, so I did. But once I replace it, the fan wouldn't come back on, on the 1st speed level or 5th. So, I placed the fan thinking that was it, still nothing.
Just trying to see where do I go from here?

6 Replies

JACOBANDNICKOLAS

MECHANIC
109,932 POSTS

Hi,

The blower motor resistor is what determines the fan speed. Power is directed through the resistor by the controller.

If you told me the fan only ran at high speed, the resister would be my first suspect. However, it doesn't seem that is what is happening.

The fan motor only runs as fast as the power supplied allows, so the motor wouldn't be the issue.

Why was the controller replaced? Is the part you installed new or remanufactured?

Let me know.

Joe

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Friday, January 3rd, 2025 AT 7:41 PM

JUWANSAYLES

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4 POSTS

I believe it was remanufactured and bought off eBay.
It worked when plugged in the first time, which is how I knew the resistor was bad cause even when truck off, the fan will still blow full speed. So, I unplugged the control module until I got the new resistor and fan.

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Saturday, January 4th, 2025 AT 1:18 AM

JACOBANDNICKOLAS

MECHANIC
109,932 POSTS

Hi,

If you got it online, there is a chance you got a faulty part. Since it works on high, the blower motor is most likely good, however, the resister is the likely problem.

I would start with that. Let me know if it resolves the issue.

Joe

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Saturday, January 4th, 2025 AT 5:42 PM

JUWANSAYLES

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4 POSTS

I have replaced everything, blower fan, resistor and just replaced the climate control module with a brand new $450 one from Dorman. Still nothing.

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Sunday, January 5th, 2025 AT 10:59 AM

JACOBANDNICKOLAS

MECHANIC
109,932 POSTS

Hi:

Does it even work on high now? Do me a favor. Read through the list I attached below and let me know which one you have. We need to start checking the wiring to see if there is a possible open circuit. I just need to make sure I am looking at the correct schematic.

Joe

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