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01-23-2013, 06:49 PM #1
No heat while idling, Only when cruising/accelerating?
So, I noticed a little problem with "timmy" today. I went out to start it 10 minutes before I was leaving for work, turned the heater knobs all the way to hi, expecting to get in a warm vehicle 10 minutes later... Well, I got in and it was as cold as it was outside (9 Degrees) Air was blowing ice cold, and I assumed it was just because I was used to how fast my commuter car (nissan 240sx) heats up. So I lowered the knobs, and started driving. Almost instantly, I felt the heat kick in. so I blasted it again. Great! So I pull up to the coffee shop, and while I'm idling in the drive thru, I notice my heat turn slowly to cold... Start driving again, and it heated up again! What could be causing this? I don't know much about heater cores, but could this be the issue? Any ideas, or suggestions about how to diagnose this would be greatly appreciated... I'd rather not have to put my truck in neutral and rev it at red lights to keep my heat on.00 Chevy Tahoe LT, 5.3 4x4
01-23-2013, 07:01 PM #2
Not knowing what make/model/year "timmy" is, I guess I'll assume "timmy" is your 2000 Tahoe.
It's probably not your heater core, but more than likely the actuator that controls the antifreeze going into the heater core. It might be the rotary switch on your dash as well.
The NBS trucks heater cores require the dash to be completely dis-assembled to replace them.
2013 Silverado LTZ White Diamond Crew Cab
Advent OGM1 Navigation
Husky Liners GearBox Underseat Storage
EGR Rail Caps
K&N Air Filter
Flowsound 40 Muffler
Hypertech Max Energy Tune (only top end limiter removed and AFM disabled)
Chrome Tailgate Handle Cover
TonnoPro HF-155 Tonneau Cover
WeatherTech Front and Rear Splash Guards
Husky Liners X-Act Contour Floor Liners
WeatherTech Side Window Deflectors
01-23-2013, 07:12 PM #3
01-23-2013, 07:27 PM #4
01-23-2013, 07:35 PM #5
Hmmm, i haven't checked it in a while, but maybe low coolant? bad thermostat?
01-23-2013, 07:43 PM #6
Low coolant is a possibility, when at idle the heater core might not be filling up with hot coolant.
My girlfriend's Cobalt appears to have a bad air flow changing mechanism (I guess that's what you call it), and will only do floor and defrost. Her car uses electronic actuators to rotate a plate to change each flue's position. She's living with floor and defrost, hopefully the mechanism isn't too expensive to replace.
01-23-2013, 09:54 PM #7
- - - Updated - - -
And the reason I said thermostat because maybe it was faulty and stuck open? But that wouldn't make sense because I'm getting head while moving.
- - - Updated - - -
So, due to someone talking out of their a$$ on fb, i went outside now, at 12 degrees, to figure out what was wrong. topped it off, and heat cranked like normal. And when I said the coolant was low, that was an understatement. Now tomorrow project is to figure out why coolant was that low. I haven't check it in a while, but it could have been something from the accident.
01-24-2013, 12:19 AM #8
1995 Silverado 4x4
6" BDS Suspension Lift-3" Body Lift-Add A Leaf in rear -Trailmaster SSV Shocks-Duel Steering Stabilizer Kit -AirAid Cold air intake-
4.56 Gears with Detroit Auburn Locker-Pro-Comp Traction Bars with duel shocks-Aluminum Skid Plate Kit-38.5" x 16.5" Mickey Thompson Baja Claws-Constant Dropping fuel gauge
2005 Yukon XL Jet Power Programmer, Bilstein Shocks, Bilstein rear springs, Helwig Anti-sway bars, EGR Window Visors, EGR Hood Shield, Denali Headlights, Headlight harness upgrade, GE NightHawk Bulbs, White Night Rear lighting system, Russell Braided SS brake lines, PowerStop Brake pads, PowerStop cross drilled and Slotted Rotors, http://www.gmtruckclub.com/forum/sho...5-GMC-Yukon-XL
2002 Silverado ext cab 2wd (Sold)
2003 Yukon XL (Totaled)
01-24-2013, 03:24 AM #9
If you are that low on coolant it's either leaking out (preferrable) or leaking into the engine (bad).
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