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  1. #1

    Default Heater takes forever

    Hey guys, my '00 Silverado 1500 4.8L takes a very long time for the heater to get hot, before i leave to work I let it warm up for 10 min with the heater blasting, then I drive for another 10 before I even feel a little bit on warm air, I don't know where to start looking? Also the fan makes a lot of noise with the A/C on but not so much with the heat I don't know if this is part of the problem or a separate issue

  2. #2

    Default

    Welcome to GMTC! Is the coolant level full When was the last time it had a coolant flush? I can let my 05 yukon xl idle for 10 minutes and I will have luke warm air. But, within a minute or 2 of driving it is warm. I also park in a garage that never gets below 35 degrees. If it is 10 degrees out it is going to take your truck longer to warm up. Possible causes for your issue are, bad thermostat, partially plugged heater core, low coolant. I am betting on a sticking thermostat. I would change it out and flush the system while you are at it. Cost you $25 for the thermostat and gasket. (be sure to not let the guys at the parts store talk you into a "fail safe" thermostat. They tend to stay open and you will never get hot heat) By letting your truck idle with the blower full blast you actually causing your truck to take longer to heat up. You are displacing heat from your coolant with the heater core. Like another radiator. That is why when your truck over heats they say to blast the heat. It displaces heat from the cooling system faster. If you let it idle with the blower off or on low it should heat up slightly faster.

    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)

  3. #3

    Default

    I have also tried it with no blower on and got the same results, Coolant is full, its been about a year since I've flushed it, but I only put about 1000 miles a month on it, it is parked outside usually never colder then 20, I'll try the flush and new thermostat first and go from there, any suggestions in type of coolant and thermo? My temp gauge never goes above 180 summer or winter

  4. #4

    Default

    If your thermostat is stuck open, you will not get any heat. The thermostat is designed to trap the water in the engine block and keep it at a certain temperature. If the thermostat stays open, the water just circulates and you have about 5 gallons running around not getting hot.
    I like all dogs I meet, and some people too.

  5. #5

    Default

    Quote Originally Posted by evo_lution View Post
    I have also tried it with no blower on and got the same results, Coolant is full, its been about a year since I've flushed it, but I only put about 1000 miles a month on it, it is parked outside usually never colder then 20, I'll try the flush and new thermostat first and go from there, any suggestions in type of coolant and thermo? My temp gauge never goes above 180 summer or winter
    that thermostat has to be stuck open. your gauge should be just under 210 when hot

  6. #6

    Default

    Ok. Coolant flushed, and new thermostat is in, truck is running a little below 210, but still hardly any heat!!

  7. #7

    Default

    you may have air trapped in the system. how long did you let it run with the cap off after refilling it? did you turn the heater on when you flushed it? you may need to disconnect the rubber hosed going into the heater core and try to flush them out with a garden hose. Your heater core could be partially clogged.

  8. #8

    Default

    Around 20min with cap off, I flushed it through the heater with it on, now when heater is on low I can fell the warm air, but if I turn it up, if starts coming out cool, and full blast doesn't really have much force

  9. #9

    Default

    Under the hood, find the two pipes/hoses that provide the coolant flow to the heater core. Are both hot?

    If both are hot, you may have an air flow problem inside the truck (when you have the control knob set to floor and the blower on high, do you get lots of air flow from the vents?)

    If they, or one, is not hot, you have a water flow through the core problem.
    Ray

    '09 Avalanche LTZ - Black
    '05 Envoy XL (sold)

  10. #10

    Default

    The hose on the right gets hot but the left one isnt

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