Tag Archives: GMC Sierra

Stuff about my GMC Sierra full sized truck.

Details of GMs new 4.5L DuraMax diesel V-8

AutoblogGreen has some more details on the new Duramax 4.5L diesel V8 that GM is working on. It sounds like the intent is to make this new engine able to fit in any of the existing GM models that have a gas small block V8. That would include the Chevy and GMC light duty trucks, as well as the Yukon and the Hummer H2. The downside is that it won’t be available until after 2009 so we’re stuck waiting until the 2010 model year (at the earliest) to get our hands on this new diesel.

PickupTruck.com has an article on the new 4.5L diesel V8 also and they reference an Automotive News article stating that the engine will get 30 mpg (7.8 L/100km) highway. That’s a pretty substantial improvement over the 22 mpg (10.7 L/100km) that the 5.3L V8 gets.

GM announces new light duty 4.5L V-8 diesel for North America

I was reading the Autoblog Green article GM announces new light duty 4.5L V-8 diesel for North America which made me a little excited. This would be a fabulous option for people like myself who would like to have a diesel pickup but not a heavy duty work horse truck. This diesel is smaller than the current 4.8L V8 gas engine (like I had in my old trucks) and produces more horsepower and way more torque. There is a reference to a 25% reduction in fuel consumption over the existing gas engines. I can only assume that this is a comparison to the 5.3L V8 that is pretty much the defacto standard engine in a GM full-sized truck.

Now, I was confused by the first comment on the article because the poster simply missed the point. They should be impressed by a 25% reduction in fuel consumption for pickup trucks. According to the sales numbers on pickuptruck.com, GM has sold a combined 350,000 pickup trucks to the end of May 2007. That will be almost 850,000 trucks by the end of the year. If the majority of those trucks can see a reduction of 25% in their fuel consumption, just think of how much less fuel will be used.

The poster may not see the use of a pickup truck but I’ll bet that a lot of their service companies, contractors, emergency services and other commercial operations do. They all drive a lot more in a year than the average family of 4. 50+ mpg makes very little difference on the whole. Yeah, it helps your own pocket a bit more but unless you’re driving a lot more than the average, you may be no better off once you take into consideration the (current) extra cost of a diesel. I’ve done the math and it almost make sense for me. I commute over 110km (almost 70 miles) a day and if I weren’t carpooling with two other guys, I’d likely have a Volkswagen TDI already, even with the extra up front expense and higher ongoing maintenance costs.

Oh, and forget the H2 being mentioned in the original article, that’s the red herring to get you to bite.

Air vent selector no longer working

As of this morning, my air vent selector is no longer working on my 2004 GMC Sierra. Needless to say, I was a little pissed when I couldn’t get any air to come out of the defrost vents since it was about -20°C this morning when I started on my way to worrk. I had left the selector on the floor vent mode like I usually do. This morning I tried to turn the vent selector to the defrost mode (which should also kick on the air conditioner) but the air kept coming out of the floor vents. I couldn’t tell if the air conditioner kicked on or not but since there was no air flow at all coming out of the defrost vents, I’m assuming it didn’t turn on.

After about 5 minutes driving with a fogged up front windshield, there was enough air movement to slowly start to defrost the windows. I was hoping it might just be that the diverter was frozen and eventually the air vent selector would switch properly. No such luck. So instead of coming straight to work this morning, I had to drop the truck off at the dealership to get them to take a look at it. Speaking of which, I should give them a call and see what’s going on.

It’s weird, this new truck doesn’t seem to be quite as solid as my old 2001 GMC Sierra. It groans when it starts, creaks on rougher terrain and has some odd suspension noises at times. I’m really starting to think that my next vehicle won’t be a GM.

Update: I called the dealership and they told me that they couldn’t reproduce the problem. Fun! Hopefully that is actually the case and it was just some stupid glitch this morning. As long as my air vent selector works and it doesn’t get stuck again, I don’t care. I’ll find out more when I get to the dealer after work and talk to them.

Frozen Washer Fluid Sucks

It really sucks when your washer fluid freezes in the lines leading up to the wipers. I had been driving around for almost a week trying to figure out how to melt the ice that had formed in the line on my driver’s side. Luckily it’s been dry along with the -26�C weather we’ve been having. Hmm, “luckily” seems wrong in that statement.

Anyhoo, I was getting ready to hit it with the hair dryer this afternoon as my last resort. However, we were over at Place D’Orl�ans and I parked in the underground lot. Apparently it was just warm enough! No more frozen washer fluid line! :)

I probably left a good amount there though. Figured I should run enough fluid through to try and not have it freeze again tonight.

2004 GMC Sierra Wiper Arms

My old 2001 Sierra had wiper arms that you could pull up and they would stay off the windshield. They locked into place and it was great because you could do this when clearing ice/frost/snow off of the windshield. It also made it a lot easier when you knew freezing rain was coming.

So, what did they do to the 2004 Sierra? Well, they made it impossible to do this now. Heck, you can barely pull the wiper up enough to get a snow brush under it. The hinge now has a solid metal piece that prevents you from flipping up the wiper. Well, at least I’ve been unable to flip mine up. The old truck didn’t require any force so I don’t really want to pull hard on the new ones.