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Replace heater core for 91 lumina apv - 1991 Chevrolet Lumina Apv

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Posted on Jan 02, 2017

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SOURCE: How do i change the heater core in 91 lumina apv

Remove glove box and pull computer down from holder, remove air vent valve from under dash and take the fuse box loose. from dash. you will find 6 screws holding cover in place over core. remove them then and remove two bolts that support dash board. pull dash out and remove core cover. Then take hoses loose under hood. You will find one core support on bottom of the left side remove it and take core out you will find the core will cost between 70 and 90 bucks then assemble back the same way.

Posted on Oct 25, 2008

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1 Answer

No heat


Check for the following causes:
  • Insufficient coolant - i. e., not enough to permit flow in the heater core.
  • Anti-freeze concentration (too much water will allow the liquid to freeze in the radiator, heater core or hoses). This can also cause engine overheating.
  • Collapsed hose to heater core (check both hoses).
  • Bad thermostat on engine.
  • Heater blower not working.
  • Heater door not opening.

Feb 28, 2011 | 1993 Chevrolet Lumina APV

1 Answer

I need instructions on how to replace a bad heater core in my 1990 chev. lumina apv van. Not sure how to do this.


you can get a repair manual on ebay for less than the price of a tank of gas. there will be instructions and photos in it. also search youtube for videos

Dec 08, 2010 | 1992 Chevrolet Lumina APV

1 Answer

Step by step discription on replacing heater core 1995 lumina apv 3.1


I would suggest photo copying the page from local library moters manuel to many things to do from memery.

Nov 27, 2010 | 1995 Chevrolet Lumina Apv

1 Answer

Heater only blows only on defrost


Check for any broken vacuum lines under the hood. Listen for any hissing sounds . If that does not help, try checking the heater core resistor under the dash board. It is connected to a 2 to 4 wire plug near the heater core. This causes speed fan problems among others.You may have to replace the resistor. It is not too easy to remove and install. You will have very little space .

Dec 29, 2009 | 1990 Chevrolet Lumina APV

1 Answer

Help with heater core replacement - what is the easiest way to replace this?


  1. Disconnect the negative battery cable.
  2. Remove the air cleaner and duct assembly.
  3. Drain and recycle the engine coolant.
  4. Disconnect the wiper linkage from the wiper motor.
  5. Detach both heater hoses at the heater core.
  6. Remove the lower center console.
  7. Remove both instrument panel insulators.
  8. Remove the heater outlet module screws, and the heater cover.
  9. Remove the heater core mounting clip screw, and the heater core line clamp screw.
  10. Carefully pull the heater core from the case.
  11. If necessary, remove the foam seals on the heater core module for transfer to the replacement core.
  12. If necessary, remove the heater core line clamp for transfer to the replacement core.
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You must disconnect the wiper linkage to allow clearance for removing the heater core coolant hoses

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View of the HVAC module—1 is the A/C module, two is the front blower motor (interior mount style)

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View of the heater core cover and related components

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Exploded view of the heater core case assembly

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Schematic of the HVAC Module air flow controls and air path diverter doors

To install:
  1. Installation is the reversal of the removal process. Tighten the mounting screws to 27 inch lbs. (3 Nm).

Sorry but this is the only way to replace it.

Dec 07, 2009 | 1992 Chevrolet Lumina APV

1 Answer

Need to chang a heater core in this van its a 92 lumana apv


Disconnect the inlet and outlet pipes on the upper right side of the firewall (Its somewhat of a long reach but you can do it) Drain the radiator and then remove the heater core. Its inside the van located in the heater box under the passenger side of the dash board. I believe you may have to remove the inner glove box. I know that is the case on the TransPort and the Silhouette but the Lumina dash is somewhat different in style.

Apr 12, 2009 | 1992 Chevrolet Lumina APV

1 Answer

Air not blowing on high


What kind of van is it? Sounds like the blower motor resistor.

Mar 18, 2009 | 1994 Chevrolet Lumina APV

1 Answer

How do i change the heater core in 91 lumina apv


Remove glove box and pull computer down from holder, remove air vent valve from under dash and take the fuse box loose. from dash. you will find 6 screws holding cover in place over core. remove them then and remove two bolts that support dash board. pull dash out and remove core cover. Then take hoses loose under hood. You will find one core support on bottom of the left side remove it and take core out you will find the core will cost between 70 and 90 bucks then assemble back the same way.

Sep 22, 2008 | 1992 Chevrolet Lumina APV

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