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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.
Drivers side rear of the engine in the valve cover. The PCV hose will have a foam cover once that is pulled back you will see the pcv valve underneath.
The security system (Passlock) is having problems, it's typical on those trucks. You can find a great write-up here: http://newrockies.ca , it was the only thing that saved my Park Avenue.
THERE IS A PURGE VALVE ON TOP FRONT OF INTAKE AND A VENT VALVE IN REAR ON DRIVER SIDE NEAR GAS TANK.GM HAS A UPDATED REPLACEMENT VENT VALVE WITH HOSES FOR $300. PURGE AND VENT VALVE WORK TOGETHER TO VENT FUEL VAPORS FROM GAS TANK.
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