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    Heater problems and it's freaking cold!

    Ok, so my 2000 GMC Yukon is blowing cold air at idle RPMS's. The coolant was changed out about 10 months ago, so it's unlikely that there's a problem with that (level is great). After startup, I've let the truck run for upwards of 15-20 minutes and get only cold air. BUT, if I rev the RPM's...
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    Coolant amount: 2 or 4 gallons?

    Ah, good point. I didn't pull the drain plugs off of the block, so perhaps there's still a bit left inside.
  3. S

    Coolant amount: 2 or 4 gallons?

    Alrighty folks, I swapped-out my thermostat on my 2000 Yukon after the truck temp pegged on the gauge AND I was getting cold air from the heater. I assumed that the thermostat was stuck "closed" so a replacement was in order. I proceeded to drain the coolant from the system, and was...
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    Oil leaks!

    Yep. I have noticed the same thing on my 2000 Yukon as well--although not as severe. I changed my oil and filter a couple of days ago, and was able to visualize the entire area with good light and access (my fire station has a mechanics pit). The pictures you're showing are very similar...
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    Tune-Up Items for a 2000 Yukon?

    Page two? Do tell brutha! I'm going to do it all...
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    Fluctuaning Heater on 200 GMC yukon

    Well, the coolant was slightly low, and I topped it off with 50/50. I started it up and let the engine come up to temp. It's been very cold in the Seattle area (20's-low 30's for low temps), so I let it warm up for about 5 minutes. The heater did seem to warm up faster, but I feel it still...
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    Fluctuaning Heater on 200 GMC yukon

    Thanks, I'll continue to troubleshoot and evaluate the things you mentioned. CR
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    Fluctuaning Heater on 200 GMC yukon

    Alright, kind of a weird thing on my 2000 GMC Yukon. I notice that after starting, and allowing the truck to "warm up," the heater does not blow warm/hot air. It's simply cold. BUT, after I begin driving for a length of time, AND at higher RPM's, the heater starts to work--providing warm/hot...
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    Tune-Up Items for a 2000 Yukon?

    What's up y'all! Hey this is my first post ever! I have a 2000 GMC Yukon (new body style), and my wife is the primary driver. Typically she handles "her" car/truck and I take care of mine. The rig has about 140,000 miles, and it's due for a tune up (not sure when the last one was). I'm...

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