Question about 1999 Chevrolet Tahoe

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99 tahoe air flow problem

I have a 99 tahoe and the air flow from all vents and defrost is minimal, i replaced the heater core and the blower motor with three different ones. all the blend doors are working properly.

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  • abwigs Jan 10, 2009

    1999 chevy tahoo does not have a cab filter, thanks for something different to look at.

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  • 196 Answers

Have you replaced the cab filter ?

Posted on Jan 07, 2009

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1 Answer

Heater not blowing hot air


IT could be one of several things: possible the blower fan motor is bad; or the valve that lets the hot water in from the engine to the heater core is not opening; or the door that lets the air flow past the heater core and onward to your vents is not opening. All these are controlled by your heater switch, via relays and vacuum lines. If the blower motor works well when you put power to it directly, but not when it is hooked to the car, a connection in the switch or a relay may be bad. if you get little or no effort from the blower motor when you hook it directly to a good battery, it's the blower motor itself gone bad. If you get airflow but not heat, it's the device which diverts the hot water into the heater core. and if its the door to let air flow over the heater core, it could be a relay, a vacuum hose or the switch.

Dec 09, 2013 | BMW 325 Cars & Trucks

1 Answer

Overheating


Couple of possibilities here. One is the heater core bypass valve that allows the coolant to flow to the heater core. Make sure that the vacuum tube has not come off of it. Should be under the hood just on top of the blower motor assembly. Let the engine get hot and check to see if the hoses going to the heater core are getting hot coolant flowing through them.

Does the air flow through the defroster, front vents, and floor vents when they are selected? If not, this can indicate a vacuum leak on the HVAC control panel or a failure of the switch.

Nov 24, 2012 | 1999 Plymouth Voyager

1 Answer

The heater stays on the floor will not go to defrost


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Could be faulting acutar motor for the hot air door. stocks5958.gif (1) Heater Core Cover (2) Heater Core (3) A/C Defroster Seal (4) Upper HVAC Module Case (5) Dash Seal (6) A/C Valve (7) Heater/Defroster Valve (8) Temperature Valve (9) A/C Valve Lever (10) Mode Valve Actuator (11) Heater/Defroster Valve Lever (12) Mode Valve Cam (13) Lower HVAC Module Case (14) Rear Heater Duct Seal (15) Temperature Valve Actuator Screw (16) Temperature Valve Actuator (17) HVAC Module Wiring Harness (18) Blower Motor Resistor/Relay Assembly (19) Blower Motor Acoustic Insulator (20) Blower Motor (21) Blower Motor Fan (22) Passenger Compartment Air Filter Access Door (23) Dash Seal (24) Evaporator Block Seal (25) Evaporator Core (26) Passenger Compartment Air Filters (27) Air Inlet Valve (28) Air Inlet Housing (29) Air Inlet Housing Seal (30) Air Inlet Actuator (31) Heater Core Pipe Seal

Dec 28, 2010 | 1999 Chevrolet Silverado 1500

1 Answer

Heater heats but does not blow. Is the Heater core fused


So the blower motor doesn't work? if so check the link below.

blower motor does not work


Or the blower motor works but there is not very good air flow out the vents? If so it was pretty common on the older GM's for the evap core to leak and cause a bunch of debris/dust/dirt to stick to it causing airflow to slowly be limited as it became covered in dirt. Sometimes you can remove the blower motor and clean the evap core to regain some air flow.

Nov 21, 2010 | 1992 Oldsmobile Cutlass Ciera

3 Answers

My heater is not working in my 2001 honda civic. Is it my thermostat?


Does the heater blow cold air from the vents or do you mean the there is no airflow from the vents? cold air from the dash vents when the heater control valve is set fully hot could be an air pocket in the cooling system. The radiator sits slightly lower than the engine causing air pockets to get trapped in the engine when you replace the coolant. you'll have to purge the cooling system to restore flow to the heater core. No airflow (blower motor inop) this could be a bad blower motor transistor. pin test the blower motor circuit.

Jan 06, 2010 | 2001 Honda Civic

1 Answer

Blown heater core in a 1977 ford f-150 pick-up


1976-79 Without Air Conditioning
  1. Disconnect the temperature and function control Bowden cables from the heater housing. This must be done to prevent damage to the cables.
  2. Disconnect the wires from the blower resistor.
  3. Remove five screws attaching the air inlet (vent) duct to the heater housing.
  4. Disconnect the blower wires.
  5. Drain the radiator and remove the heater hoses from the heater core.
  6. Remove three heater stud retaining nuts and remove heater.
  7. Remove gasket between the heater hose ends and the dash panel at core tubes.
  8. Remove heater core cover and gasket (four screws).
  9. Pull heater core and lower support from heater.

To install:
  1. Install foam gaskets on heater core and install in heater assembly.
  2. Install the core seal and cover plate.
  3. Position heater assembly in vehicle and install three stud retaining nuts.
  4. Connect heater hoses to heater core and fill radiator.
  5. Connect blower motor wires.
  6. Place defroster nozzle on heater so that the defroster and heater openings are in the up position, and there is no air leak around the seal.
  7. Install air inlet (vent) duct to heater. Push duct firmly against seal on side cowl and tighten five attaching screws.
  8. Connect wires to blower motor resistor.
  9. Connect temperature and function control cables to heater, and adjust the cables.
  10. Reinstall gasket between the heater hose ends and the dash panel at core ends.
  11. Fill Cooling System.

  12. Hope this helps you! Please remember to rate my solution.

    Lefty64

Apr 09, 2009 | 1986 Ford F150 SuperCab

2 Answers

Heater problems


I believe you have one of two problems either your heater core is plugged up and not allowing enough flow or the temperature blend door located under the dash is not moving.The heater core is easy to check,A quick check of the heater core is with the engine running and with the blower motor off or on low carefully chck to see if both heater hoses are equally hot if not remove them from the heater core and use a garden hose to backflush it the blend door can be more of a hassle as it can be operated by a motor or vacuum servo and even a simple cable these also have been known to break but with the blower on high change the temp control from cold to hot and see if you can hear a change in the sound of the blower and sometimes you can hear the door shut it more than likely the door is ok but you will need to check it and see.
Good Luck
Jim

Oct 07, 2008 | 1993 Geo Tracker

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