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  1. #1

    Default Heater blowing cold air and 4 wheel drive not engaging: HELP!

    hi own a 95 chevy k2500 and recently the heat just blows cold air. i've already replaced the temp sensor, thermostat, blower relay, and blower resister, & flushed the coolant system, yet still nothing. also, it only blows on high setting. if the blower is on low or medium nothing blows out and the ABS light comes on. When the ABS light comes on there is a noticeable difference the driving power. Really just need help figuring this all out, if anyone can help out i'd appreciate it. Also, four wheel drive is not engaging either??

  2. #2

    mfleetwood's Avatar
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    Jul 2010
    Denver, CO
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    Sorry, I don't have any answers for you, but I did change the name of your thread so that you will get more people to read it, which will drive more replies in a shorter time.

    Good luck!!

    Mike (Denver, CO) - 2008 Sierra 1500 Z71 SLE 5.3L 4WD

    SUSPENSION: Rancho 4" Suspension Lift; Rancho RS9000XL Shocks; Rancho Skid Plates; Rancho MyRide Wireless Shock Controller;
    BFG All Terrain KO 315/70/17
    DRIVE TRAIN: 4.56 Gears; Detroit TrueTrac Differential; True Cool 40k Transmission Cooler
    PERFORMANCE: DiableSport Predator Tuner; Custom Tuned by Diablew; Magnaflow Exhaust; AFE Cold Air Intake
    ELECTRONICS: Kenwood DNX6180 Touchscreen; Subthump box w/10" Kicker; Driver Information Center (DIC); Rear View Camera
    ACCESSORIES: Westin Brush/Grill Gaurd; Westin Nerf Bars; Truxedo Tonneau; 20% Tint; Tow Mirrors w/Heat & Signals

  3. #3


    lol thanks man

  4. #4


    ok the cold air and no 4x4 is a vacuum leak. Look under the truck on the front axle passenger tube there is an actuator there with a vacuum line run to it. Follow that line back to the intake looking for broken or rotted lines. Check the rest of the lines coming off of the intake for the same. The blower motor is prob the resister pack under the dash, im not sure where it is on your year truck. As for the ABS I need more details like if it is activating causing the pedal to vibrate/pulse while braking etc.
    01' 1500 LT Z71 ECSB 5.3L
    line-x'd front brush guard with KC Daylighters, 6000k HID lows and highs, rewired highbeams, Trans-go mild shift kit, custom stainless duals, 3500 dually OEM taillights, K&N CAI. Still have OEM fender flairs and leveling kit in boxes waiting for time.

  5. #5


    thanks i will check out that vacuum line. as for the abs light when its on the braking in the truck doesn't change all that much maybe a little more vibration then usual. but the weirdest thing to me is when the abs light comes on while driving it will cut out the heat and, if im in four wheel (when it worked) it would knock that out to. anyone i,ve ever said that to has always been like "no way are you sure" i've checked everything i know how to check and cant figure it out. hopefully someone on here knows whats up. forgot to mention that when that light comes on it also seems to raise the rpms by a few hundred

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