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2007 chevy trailblazer ss, steady loud knock behind glove…

Customer Question
2007 chevy trailblazer ss ...

2007 chevy trailblazer ss

Mechanic's Assistant: Are you fixing your Trailblazer yourself? What have you tried so far?

Steady loud knock behind glove box when turn motor on. AC/heat works, but think may be blend door actuator'

Mechanic's Assistant: Have you checked the coolant level? Has there been any leaking from the hoses?

No

Mechanic's Assistant: Anything else you want the mechanic to know before I connect you?

I love my car?? lol but the knock is relentless

Submitted: 9 months ago.Category: Chevy
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Answered in 4 minutes by:
9/8/2017
Chevy Mechanic: Gunvir Singh,
 replied 9 months ago
Gunvir Singh
Category: Chevy
Satisfied Customers: 2,013
Experience: Master Tech at Kennesaw Auto Tech
Verified

Hello, let me rebiew your request. Please stand by.

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Customer reply replied 9 months ago
okay thank you!
Customer reply replied 9 months ago
car not here for phone call remedy
Customer reply replied 9 months ago
turn on vehicle, loud knock starts and continues until shut off. heat ac works fine.
Chevy Mechanic: Gunvir Singh,
 replied 9 months ago

No need to call, just ignore the pop up.

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Chevy Mechanic: Gunvir Singh,
 replied 9 months ago

Are all the ac air controls working fine?

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Customer reply replied 9 months ago
but past couple years onlybon high setting for ac...doesnt blow on 1,2,3 or 4
Just 5 on knob for Ac or heat flow
Chevy Mechanic: Gunvir Singh,
 replied 9 months ago

The noise from behind the glove box is from eithe the defrost/ passenger air temp ot mode door actuator. They are installed close to each other. The issue with the blower only working at high speed points towards a faulty blower motor resistor.

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Customer reply replied 9 months ago
How determine which it is
Customer reply replied 9 months ago
I had reliable mechamic say had take dash apart get at it but forgot what said problem was
Chevy Mechanic: Gunvir Singh,
 replied 9 months ago

The complete dash does not have to come apart. The instrument panel carrier will need to be removed to get access to the HVAC housin where these actuators are installed. At that time you can touch the actuator and check which one is knocking.

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Chevy Mechanic: Gunvir Singh,
 replied 9 months ago

Only other way is by using a compatible scan tool to command the actuators one by one and check which one is the culprit.

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Customer reply replied 9 months ago
both repairs do not require pulling dash
Chevy Mechanic: Gunvir Singh,
 replied 9 months ago

Let me confirm. Do you have electronically adjustable brake pedal?

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Customer reply replied 9 months ago
Not sure
2007 chevy tb ss
Chevy Mechanic: Gunvir Singh,
 replied 9 months ago

Do you have the VIN number. I can check it with that.

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Customer reply replied 9 months ago
Not rigjt now car willbe back 530 pm
Chevy Mechanic: Gunvir Singh,
 replied 9 months ago

No problem. Let me check, if i can get the info without the vin.

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Chevy Mechanic: Gunvir Singh,
 replied 9 months ago

You do have automatic temperature control?

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Customer reply replied 9 months ago
No auto temp contril
Manual w knobs
Chevy Mechanic: Gunvir Singh,
 replied 9 months ago

Ok. Unfortunatelu on that model dash will need to be removed. It calls for approx 5 hours of labor.

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Chevy Mechanic: Gunvir Singh,
 replied 9 months ago

Do you have any other questions?

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Customer reply replied 9 months ago
wha t part needs be replaced please
Customer reply replied 9 months ago
What part?
Chevy Mechanic: Gunvir Singh,
 replied 9 months ago

For the noise one of the door actuators. Need to get access to the HVAC housing by removing dash to determine which one is faulty. In my experience i will recommend to replace all three as all three have same age on them. The actuators are not very expensive the labor is. If you only change one and another one goes out then you will be paying for the same labor again.

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Chevy Mechanic: Gunvir Singh,
 replied 9 months ago

And for the blower speed issue, i will recommend to check the blower motor resistor.

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Chevy Mechanic: Gunvir Singh,
 replied 9 months ago

Please read this:

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Chevy Mechanic: Gunvir Singh,
 replied 9 months ago

Hello, just checking if any updates?

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