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2003 Silverado Z71 LS 1500 with Duel Climate, Blower?

lawenforcer10

By lawenforcer10
in Ask A GM Technician

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lawenforcer10 Enthusiast

lawenforcer10

Posted
Posted

Hello I was hoping I can get some help on my issue I am having. It's on a 2003 Silverado 1500 Z71 with Duel Climate control. I got in it this mourning and started to truck and put the heat/blower on full speed...well was going down the road and all of sudden the blower quit working...so know I have no blower/heat and it's literally zero degrees out today...well I was driving a short time later and it temporary for a few seconds turned on and then quit again and hasn't come back on...can someone please help with details on what to check or what you thino the problem is. ..I don't want to go out and just start buying parts and it not be the problem. ..thank you for any and all help on this issue...

Doug_Scott Senior Enthusiast

Doug_Scott

Posted
Posted

The most common cause of HVAC fan issues is the resistor block that is used to control fan speeds. It is generally mounted to the heater box. Check the wires that are attached to it, and you will likely see the connector is starting to melt and turn black. It has been so long since I have seen one that I cannot help with its location or how it even looks these days. Back in the day, the block hung inside the heater box, and had three or 4 coils of wire that controlled the power going to the fan motor, thus controlling the speed. High speed by-passed this block completely and had its own 30amp inline fuse on the Chrysler products.

Someone will likely post here where the resistor block is located on your truck.

 

Actually, a quick search found this

.
gmtech4 Senior Enthusiast

gmtech4

Posted
Posted

Hello I was hoping I can get some help on my issue I am having. It's on a 2003 Silverado 1500 Z71 with Duel Climate control. I got in it this mourning and started to truck and put the heat/blower on full speed...well was going down the road and all of sudden the blower quit working...so know I have no blower/heat and it's literally zero degrees out today...well I was driving a short time later and it temporary for a few seconds turned on and then quit again and hasn't come back on...can someone please help with details on what to check or what you thino the problem is. ..I don't want to go out and just start buying parts and it not be the problem. ..thank you for any and all help on this issue...

You need a new resistor module and a connector harness for it , Doug tends to ramble abit ...... Great guy though !!!!

lawenforcer10 Enthusiast

lawenforcer10

Posted
  • Author
Posted

Okay. Well I went online and looked up videos on youtube. So I know how to replace the resistor. Now the question comes that my resistor looks nothing like the ones they are replacing on the same year of trucks. There's looks like a 7 plug where mine is a 3 plug....mine doesn't look burnt or anything. Looks to be in good shape...I will post pics of mine...you all think it's still the resistor that I should change abd should i still worry about the wire? Thanks for all the help...

post-140345-0-40915400-1425106427.jpg

post-140345-0-40915400-1425106427.jpg

post-140345-0-40915400-1425106427.jpg

post-140345-0-40915400-1425106427.jpg

lawenforcer10 Enthusiast

lawenforcer10

Posted
  • Author
Posted

I think after looking online a little further it is going to be difficult to find this resistor at an auto parts store because if it has three prongs like mine it is for the auto temp control type. Which is what my duel climate control is...So it looks like I am going to have to order it and just trying to find out that this is definitely the problem before I order it and not be the problem...

lawenforcer10 Enthusiast

lawenforcer10

Posted
  • Author
Posted

I just kind of want a little reassurance that everyone thinks that it is the resistor that is the problem before I spend $100 on a part that doesn't fix it and then can't return...

gmtech4 Senior Enthusiast

gmtech4

Posted
Posted

What speeds do you have for the fan ?

 

 

I just kind of want a little reassurance that everyone thinks that it is the resistor that is the problem before I spend $100 on a part that doesn't fix it and then can't return...

lawenforcer10 Enthusiast

lawenforcer10

Posted
  • Author
Posted

What speeds do you have for the fan ?

It's doesn't have any speeds...mine is the digital automatic duel climate control...and even if you manually hit the fan button it doesn't work...it worked great and then going down the road all of sudden nothing would blow out and then probably 15 minutes later it came on for a few seconds and then quit again on its own..

gmtech4 Senior Enthusiast

gmtech4

Posted
Posted

It's doesn't have any speeds...mine is the digital automatic duel climate control...and even if you manually hit the fan button it doesn't work...it worked great and then going down the road all of sudden nothing would blow out and then probably 15 minutes later it came on for a few seconds and then quit again on its own..

Is there power at the resistor module ?

 

Is the there power at the blower at any speed selected ?

 

If you answered yes and no then the resistor module is deceased !!!! Lol

lawenforcer10 Enthusiast

lawenforcer10

Posted
  • Author
Posted

Ok. Went to the parts store and they told me if I bought the resistor that uf it doesn't fix it then I could not return it...so instead of possibly wasting $100 on the part. I went back home and used a jumper wire to run power directly to my blower motor to make sure it was still good. It checked out to be good. So went back and bought the resistor and had to wire it in cause it goes from a 3 plug to using a 5 plug now but it was simple and fixed the problem. Thank goodness cause we are prejected to get up to 8 inches of snow tonight :-) Thanks for all the advice and help...

Doug_Scott Senior Enthusiast

Doug_Scott

Posted
Posted

Happy to read it is fixed. Looking at the replacement you would never expect it to actually connect, even using the patch cord it came with. Yours was a three wire, new one is a 2 wire, with a 5 wire patch cord.

I think there was a recall for this in Canada a few years ago. Don't recall for sure, but I know there was some public notice regarding hvac fan in the 03-07 model GM trucks..

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