Junkyard Find: 2005 Saab 9-7X Linear

The General had a healthy sales hit with the GMT360 platform in the 2002 model year, when the new Chevrolet Trailblazer, GMC Envoy, and Oldsmobile Bravada hit the showrooms. Since GM had devoured Saab in 2000 and most American car shoppers wanted trucks or truck-shaped machines by that point, it seemed to make sense to produce a Saab-badged GMT360 and extract some cash from that slice of the car-buying populace that craved both the rugged-lifestyle signifiers of a truck and the quirky-yet-sensible Swedish image of a Saab. The Isuzu-badged version— the Ascender— had had its debut for 2004, and so the Saab 9-7X appeared for 2005 (sadly, no Daewoo- or Vauxhall-badged versions were produced). Here’s a first-model-year 9-7X, found in a Denver self-service yard last week.

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Piston Slap: The Envoy's High Pressure Mission?

Dave writes:

Hello Sajeev,

I have a 2004 GMC Envoy, 4.2-liter six-cylinder, with about 123k miles that seems to be leaking coolant from somewhere around the radiator cap. Every time I come to a stop with the windows down or pull into the garage I can smell antifreeze. The radiator appears full and the reservoir seems to be maintaining a fairly consistent level of the pink stuff. It never leaks enough that I see wet spots except now and then around the cap, and even then it’s only a few drops at most. I’ve taken it to the mechanic; they double checked all the hoses and connections and even replaced the cap, but it didn’t help.

I replaced the cap a second time thinking I got a bad one, but the smell remains. By happenstance the cap I bought happened to be the exact same brand the mechanic used. I’ve attached a picture of the engine bay showing the areas where I can see dried coolant. The perplexing part to me is that, judging by the splatter pattern near the oil fill and the air filter box, some of the coolant seems to be making it to the fan. Still, I never see any wet spots leading in that direction. Do you have any suggestions?

As a side question, I have been getting an intermittent CEL with an associated P0526 code (fan speed sensor). It will come on for a trip or two and then go away on its own. Any chance the supposed coolant hitting the fan could be causing the CEL?

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