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My radiator got cracked by letting a friend use my 2003 gmc envoy, I think near the reserve, they used some kind of poxy to seal it. it was running good for about a month, as long as I keep anti-freeze in it. I noticed todat it was running high, the reserve has antifreeze in it, should i pour more into the radiator?

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Yes, Check the Radiator. it can still be low on fluid and have some in the Reservoir.

Posted on Jan 12, 2009

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How to purge radiator on a 2003 GMC envoy


Install a back flush kit on the engine. Connecting a garden hose to it will push any air in the block into the radiator so you can see when the air has been purged.

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I just changed the oil in my 2003 Gmc envoy and the oil is dark, sludgy and foamy. I checked my coolant and it is good. There is no white yogurt under the oil cap. What could it be?


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1 Answer

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Two things: #1 someone has overfilled it by mistake thinking they were putting oil in the engine. Yes I have seen this.
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Jan 01, 2012 | 2003 GMC Envoy

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NEED TWO PEOPLE, USE PIANO WIRE GUITAR STRING OR SIMULER WIRE, FROM OUT SIDE PUSH WIRE THROUGH WINDOW SEAL TO INSIDE EACH PERSON PULL WIRE AROUND WINDOW CUTTING SEAL, THEN LIFT OUT WINDOW, SCRAPE OUT OLD SEAL , REPLACE WITH NEW SEAL AND INSTALL WINDOW!

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1 Answer

Car ran hot and water is leaking near the passenger front tire near the finder. Is the water pump in this vicinity?


That sounds like the cooling system reservoir area. Those blow out coolant, not generally just water, when pressure forces the coolant past the radiator cap. You could have a crack or a bad gasket. Open the hood and see where all the dampness stain is, that would be a clue. You might be lucky and only have a bad hose.

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1 Answer

How do I locate the radiator drain plug ? 2003 GMC Envoy


It is at the lower end of the radiator you my have to re move a plastic shield / on some it faces down through a hole in the support / and others it faces toured the engine it is in the corner. be careful if it is a plastic tank and don't turn it to much cause the nut in the radiator can strip or come off . if you should need any further assistance feel free to ask thank you for using FIXYA . Have A Grate Day .

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1 Answer

Radiator drain plug for 2003 gmc envoy. need to flush radiator


if you cant find the drain plug you can pull the lower radiator hose to flush it

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1 Answer

Shuts off when the truck is idoling.


Check the coolant level in the radiator, then check the reserve resivoir. make sure the engine is cool...sometime when it gets low, you can hear it cycling more clearly...Or you have water in the heater box under your dash near the dampener....Check for leaks at all heater hose connection locations...

May 19, 2009 | 2004 GMC Envoy

1 Answer

Why does my heater keep running after I shut my Envoy off?


I have the same problem. I have also been searching the web for a solution. I came across someone saying that it was the heater module located behind the glove department. I can't find now where i read this but it said the part was approx. $150.00. He was having same problem as us, heater wouldn't obey touch commands to turn on/off or when heater did blow it would only blow real low or real high. Like you, after turning off engine blower motor was still running even though it wasn't blowing air out.
I'm tired of paying for things that are not due to normal "wear and tear" on my 2003 Envoy. Let me know if this helps you and how you repaired it. I'll probably have to take mine to the shop but because I'm a "girl" I swear they think I'm crazy with all my Envoy complaints.

Dec 01, 2008 | 2003 GMC Envoy

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