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Yes, as long as the engine is of similar size, you shouldn't have any problems fitting the radiator from a 2001 Yukon to a 2004 Yukon XL model. There are a couple of things to be aware of. The radiator should have the same connections on it as the one you are replacing for best fit, but are not required. If a mechanic is doing the work, they shouldn't have any issue resolving any concerns like auto to manual transmission differences...but playing it safe and getting the replacement from a like vehicle is best.
You need to make sure that the engine has what an engine needs to run. The obvious ones are fuel and spark. Make sure there is at least 40LBS of fuel pressure at the injector rail when cranking. If so, you will need to make sure the injectors are opening. If you verify that the engine is getting fuel you need to make sure there is fire to the plugs when cranking. If it is getting fuel and spark, you need to make sure there is enough compression for the engine to run. And lastly, if it has everything else it needs to happen at the correct time.
Seems like a common problem with these trucks. I thought I was the only one. I just posted this comment for someone who has a 2003.....I'm not an expert and not sure how widespread the warning message can be, but in my personal case:
I have a 2001 Yukon Denali.....I have the same problem and have for many months. I took it in a few times and the GMC Dealership finally told me that It's the ride air bags. In my case they are leaking. Its not the same safety airbags in the front dash to prevent injury...but these models have air bags under the truck that automatically adjust to level when weight shift...you might hear the occasional sound coming from the back while driving or when more people are in your Denali. To me it sounds like a power tool. The Service tech told me it's not harful nor will it damage anything, but it costs about $2000 to fix, because they have to replace the whole thing. He said you may notice the sound coming on from the airbags more often because of this..because the system is working harder to adjust the weight due to the leak/loss in air. So occasionally for about a year...the light comes on....but it has done nothing else.
Very easy, just going to need some simple hand tools. Possible a torx 55 bit for the front caliper pins and some sort of c clamp to push pistons back. Be sure to lube your slide up well to keep them from rusting up.