Parking brake pedal stuck on me today due to the cold. Now I got to find out where it needs to be lubed.

 

My engine knocks for a few mins until it warms up, but only when it's below 40 degrees outside. Never did look into it, but never gave me trouble any other time of year. Still runs like new!

 

Refuses to keep my feet warm due to not switching over to floor heat (not temp. related, just only needed when it starts getting cold)

 

Perfect description of piston slap. Very common on 4.3L & 5.3L engines. It's caused by a lack of lubrication on the lower cylinder walls and piston skirts. After sitting for several hours, (overnight), the oil runs off of the cylinder wall so it's dry on a cold start. What you're hearing is the piston centering itself in the cylinder for the first few degrees of crankshaft rotation, when the piston is at BDC. A steady diet of Mobil 1 full synthetic 5W30 will quiet it down, IF the damage is not excessive. Change it every 3K miles and eventually you'll notice a difference.

My 98 had 30K miles when I bought it, and it knocked pretty good cold. Switched to Mobil 1 and it went away around 40K miles. Hasn't done it since and it has 220K miles now.

 

It makes my wife bitch because it doesn't have heated seats
Fortunately the heater will just about chase you out on the coldest of days

 

Mine too. My wife asked me today why we took the Blazer. Her feet got cold. Good thing is it blows out the defrost and vents.

 

Problem with one of the vacuum actuators, (or doors), on the left end of the heater case. Above and to the right of the gas pedal. Both actuators have 2 vacuum lines, and both of them are dual position actuators. You can see both actuators, and the linkage, without any disassembly. Somebody isn't playing nice with the others

 

Helped with the jimmy, i only use mobil 1 full synthetic, had a knock for a short time when super cold when we first got it, now, not anymore.

But to add to this, mine always alerts me by having something go wrong when its cold out... Will be fine all summer long, but once it starts to get cold.... must know i dont have a garage.

 

Thanks! I might actually have to look into it now if there's a chance I don't have to pull the whole case(I tell my wife to wear 2 pair of socks. lol). Good thing (wallet wise) is I got a 98 bravada at work I can yank needed stuff from.

 

Open the driver door, get on your knees, stick your head under the steering wheel, here's what you'll see:




With the engine at idle, move the mode switch and you should see the actuators move the linkage. You can check for vacuum in each mode switch position by following this chart: