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Tim's Auto Repair
Tim's Auto Repair, mechanic
Category: Chevy
Satisfied Customers: 15766
Experience:  Have owned a repair shop for 25 yrs.
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91 chevy lumina: blows cold air..ramps..the car hasnt been drove

Resolved Question:

I have a 91 chevy lumina and the heater just blows cold air. I replaced the thermastate and tried bleeding off the air with the front of the car on ramps. the car hasn't been drove for three years . can you point me in the right dir.   the air cond. works.    even tried blowing through the heater line and water came out of the heater core.       help..............
Submitted: 7 years ago.
Category: Chevy
Expert:  Tim's Auto Repair replied 7 years ago.

does both heater hoses get hot that is connected to the core?

does the engine get hot,or does it run normal

thanks

Customer: replied 7 years ago.

the heater hoses do not seem to get hot.

the engine seems to run fine and the fans turn on and like they should.

but there is no temp gauge just a light and have never seen it come on.

the water in the raditor does get hot and seems to cycle just fine.

can.t see where the heater hose goes from the bottom of core it dissapears into the engine?? could there be a valve thats not opening??

Expert:  Tim's Auto Repair replied 7 years ago.

if the hoses dont get hot...the core3 is clogged or it still has an air pocket in it...i know you said air will go through it but coolent may not

thanks

Service and Repair

HEATER CORE

NOTE: The OEM service manual does not provide images for this procedure.

TOOL REQUIRED:

REMOVE OR DISCONNECT

  1. Air cleaner and duct assembly.
  2. Drain coolant.
  3. Rotate engine forward. See: Engine, Cooling and Exhaust\Engine\Service and Repair
  4. Both heater hoses at heater core.
  5. Right and left instrument panel sound insulators.
  6. Rear compartment heat duct adapter bolt/screw and adapter.
  7. Heater outlet duct bolts and duct.
  8. Heater core cover.
  9. Heater core.

INSTALL OR CONNECT

  1. Heater core.
  2. Heater core cover. TIGHTEN
    • Screws to 3 NM (27 lb. in.).
  1. Heater outlet duct and bolt/screws. TIGHTEN
    • Screws to 2 Nm (18 lb. in.).
  1. Rear compartment heat duct adapter and bolts/screws. TIGHTEN
    • Bolts/screws to 3 Nm (27 lb. in.).
  1. Right and left instrument panel sound insulators.
  2. Both heater hoses and clamps to heater core.
  3. Rotate engine back.
  4. Refill coolant.
  5. Air cleaner and duct assembly. TIGHTEN
    • Bolts to 5 Nm (44 lb. in.
    • ).
Inlet

 

Heater Hoses

Remove or Disconnect

 

  1. Rotate engine forward.
  2. Drain cooling system.
  3. Hose from heater core.
  4. Hose from inlet pipe.
  5. Hose.

Install or Connect

  1. Hose.
  2. Hose to inlet pipe.
  3. Hose to heater core.
  4. Rotate engine back.
  5. Refill cooling system.
Outlet

 

Heater Hoses
Quick Disconnect Fitting

 

Quick Connect Heater Inlet Nipple

Remove or Disconnect

 

  1. Drain coolant.
  2. Air cleaner and duct assembly.
  3. Heater inlet pipe retaining bolt.
  4. Heater inlet pipe quick disconnect from nipple.
  5. Quick disconnect nipple. Inspect
    • O-ring sealing surface on pipe.

Adjust

  • If replacing heater inlet nipple, remove retainer from pipe and discard, as new nipple is equipped with retainer.
  • If replacing pipe, remove retainer from pipe and reinsert retainer in nipple.
  • If reusing pipe and nipple, retainer can remain in place on pipe.

Remove or Disconnect

  1. Quick disconnect nipple.
  2. Heater inlet pipe quick disconnect to nipple.
  3. Heater inlet pipe retaining bolt. Tighten
    • Bolt/screw to 8 N.m (71 lb. in.) .
  1. Air cleaner and duct assembly. Tighten
    • Bolts to 5 N.m (44 lb. in.) .
  1. Refill coolant.
  2. Inner and Outer Mode Valve Actuator
    Locations
    icon_note_blank.gif Notes Behind RH Side Of I/P
  3. also make sure your acuator is working
  4. thanks
Customer: replied 7 years ago.

how do I make sure the acuator is working?

Expert:  Tim's Auto Repair replied 7 years ago.

hi

by pulling a vacuum on it ..it should open...also check your vacuum solinoid

thanks

Tim's Auto Repair and 3 other Chevy Specialists are ready to help you
Customer: replied 7 years ago.

Just wanted you to know that the heater core was not the problem.

I did what you suggested and it did nothing but cost me time and money.

After all of that the hose from the heater core to the thermastate was clogged.

 

Thanks

 

The repair only took 3 min. instead of the hours to replace the core.

Expert:  Tim's Auto Repair replied 7 years ago.

ok

glad you got it

thanks