On a 2004 GMC Envoy 4.2l , how do you replace heater hose that comes out of left side of block and goes behind engine to right side and then to...

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Customer

On a 2004 GMC Envoy 4.2l , how do you replace heater hose that comes out of left side of block and goes behind engine to right side and then to heater. GM says to drop transmission!!!!

Last updated
Relly De Jesus
GM Mechanic

Hello and welcome to ExpertHelp.com! My name is Relly De Jesus and I'm going to do everything in my power to answer your question to your full satisfaction!

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Last updated
Relly De Jesus
GM Mechanic

Hi Tom

How are you doing? May you pleaes check out the diagram below that may help you out on the hose layout.

This will not require a transmission drop as they're saying. I'll be standing by for your response. Hope you find this helpful.

Thank you

Relly

Posted
Customer

But what has to be removed to get to part #5?  Also, I don't think I can even touch 2 bolts #4 from above let alone get a wrench on them.

Posted
Relly De Jesus
GM Mechanic

Hello Tom

Good to hear back from you. To remove part #5 you will need a special quick connect release tool to get the fitting off the tubing. You might find the tool at your local parts store, and I think it looks like the picture below.

Is there anything else I can add or help you with Tom? 

Relly

Posted
Customer

The problem is getting to the hose where it comes out of the left side of the block and also to the two bolts #4 in the diagram. I think the battery, battery tray, serpantine belt, and alternator will have to be removed to get to the hose on the left side of the block.  Will anything else have to be removed?  Also, I don't see how the two bolts #4 in the diagram can be reached from above, I can't even see where they are located. Any idea how to get a wrench or socket in there?

Posted
Relly De Jesus
GM Mechanic

Hello Tom

Please click the blue HOSE REMOVAL link below to see how to use the special tool

HOSE REMOVAL

With regards to the part number 4 which is the bolts, I never had a chance to access it for it was always the hoses coming from the firewall I am replacing. I am suspecting that it will be access on the dash firewall. Try to look underneath the dash if you can have a good look on the bolts.

Relly

 

Posted
Customer

The 2 bolts #4 attach the metal part of this line to the back of the engine block going thru the top part of the transmisson housing.  That is why they are difficult, impossible, to get to. 

Posted
Relly De Jesus
GM Mechanic

Good to hear back from you Tom... I believe that there's no easy way to do it but to drop the tranny to gain access to the bolts. I don't think that we have special tools that can access this bolt.

Relly

Posted
Relly De Jesus
GM Mechanic

Hi Tom

How are you? Hope everything is good. Please let me know if there's anything else I can add or help you with. 

Thank you

Relly

Posted
Relly De Jesus
GM Mechanic

Dear Tom, It was a pleasure helping you with your GMC issue today. Here is a summary of the resolution.

Issue identified : Heater hose replacement
Solution Implemented : Provided diagram and procedure of heater hose replacement. Solution accepted and cx provided a tip. 
If issue resurfaces : If issue resurfaces in next 30 days, come back to this Question page and let me know. If you are unable to find your way back to this Question page, please contact our customer support either by email (s**t@experthelp.com) OR call us at ***-***-****

Posted

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