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No Heat Help?

This is a discussion on No Heat Help? within the General Help forums, part of the LSx Technical Help Section category; I have a 99 Camaro SS I turned the heat on and nothing happened I looked at the heater cord ...

  1. #1
    Junior Member
    Join Date
    Mar 2007
    USA WI

    00 SS, 93p/u

    No Heat Help?

    I have a 99 Camaro SS I turned the heat on and nothing happened I looked at the heater cord lins going in and out both looked good. I know its common for the heater cord to get cloged but when I flip it from hot to cold I don't hear any thing 00ss you could hear the flap move or a vaccum noise the 99 nothing. Any input before I dig in to it would help


  2. #2
    Join Date
    Dec 2005
    Cedar Rpaids,IA

    1998 Camaro SS

    Does the position switch still work; can you go from defrost to air coming out the middle vents to air out the bottom? If so the temp switch or wires from it could have broken. If the switch and wiring appear to be fine then check to see if the heater core is clogged. Quickest way to check it in the car is to disconnect the inlet and return lines from the heater core and try to run water through it. If the core is plugged you wont get anything out or very little out the return hose.
    1998 Camaro SS Hard Coupe Bright Red #1593
    Mods: Lots!!, still my daily driver except for winter
    383rwhp 370rwft/lbs

    1979 Corvette
    Mods Lots!!, weekend cruiser
    325rwhp and 320rwft/lbs

    2007 Dodge Ram 1500 4x4 (Yes its got a HEMI)
    Mods: Catback, BFI CAI, Winter daily driver

  3. #3
    cutting and welding mark21742's Avatar
    Join Date
    Mar 2008
    mercersburg pa

    hugger orange

    also check the vaccum line where it comes off the back of the intake at the map sensor.....big hose goes to the break booster, small hose goes to the heater controls.
    not sure about yours, but my 04 goat also has a coolant shutoff inline in the coolant hose going to the heater that is vaccum operated, might check that too

  4. #4
    old timer blue02Z's Avatar
    Join Date
    Sep 2005

    Navy Blue Metallic
    2002 Z28

    you dont have to disconnect the hoses to the heater core to see if it is clogged, just get the engine warm and turn the heate on but leave the fan on low. feel the 2 hoses with your hand, if they are both hot then your heater core is fine, if one is hot and the other is cooler or not as warm, it could possibly be plugged up

  5. #5
    Join Date
    Oct 2007
    Beaver Dam KY

    79 T/A -91 Firebird
    1998 Trans Am -Oynx Black

    Just changed my heater core out about 4 weeksish ago.

    I got the lifetime warranty from otterzone and it looks exactly like stock and I dropped about 10 degrees of normal operating temperature.

    If you bend down the glove box(two tabs you press in to get it to fold down) you can see all the vacuum hoses right there. Keep us updated

  6. #6
    Veteran 0rion's Avatar
    Join Date
    Aug 2005

    98 Formula
    06 duramax

    sounds like either a switch or vacuum issue like these guys have been saying if you're not hearing the vents switch.

  7. #7
    Junior Member
    Join Date
    Mar 2007
    USA WI

    00 SS, 93p/u

    Thanks for the input I am going to work on it this weekend and will let you know what I find.

    "vetteemt" I did test the vents that switch works fine.

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