Question about 1994 Chevrolet G20

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Replace heater core 2002 chevy 3500 - 1994 Chevrolet G20

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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  • 231 Answers

SOURCE: Heater Core

1) disconnectnegative battery cable
2) remove coolant reservoir
3) dis-connect heater hoses from heater core and plug holes in heater core, some coolant will drain out
4) remove mounting bolts and nuts on fire wall
5) remove glove box liner and door
6) lable and dis-connectheater controls
7) dis-connectand remove computer and mounting bracket
8) move radio antenna wire
9) remove kick pannel and un-bolt lower corner of dash
10) remove screws and nuts holding the housing inside the cab
11)remove the heater housing from the vehicle
12) detatch the core retaining straps and remove the heater core
13) installation is this procedure in reverse
I hope that this fixes your problem good luck and please take the time to rate this response.

Posted on Oct 17, 2008

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Shouldibuyit
  • 44 Answers

SOURCE: replace heater core 1994 chevy g20 conversion van

Here a are the instuctions to remove it. I did not know if you have A/C or not so I included both for you.

REMOVAL & INSTALLATION
Without Air Conditioning
ALL MODELS
See Figure 1

  1. Disconnect the negative battery cable.
  2. Remove the coolant recovery bottle.
  3. Place a pan under the van and disconnect the heater intake and outlet hoses. Quickly remove and plug the hoses and support them in an upright position. Drain the coolant from the heater core into the pan.
CAUTION When draining engine coolant, keep in mind that cats and dogs are attracted to ethylene glycol antifreeze and could drink any that is left in an uncovered container or in puddles on the ground. This will prove fatal in sufficient quantity. Always drain coolant into a sealable container. Coolant should be reused unless it is contaminated or is several years old.
  1. Remove the heater distributor duct-to-case attaching screws and the duct-to-engine cover screw. Remove the duct.
  2. Remove the engine cover.
  3. Remove all the instrument panel attaching screws.
  4. Carefully lower the steering column. Raise and support the right side of the instrument panel. Refer to for further details.
  5. Remove the defroster duct-to-case attaching screws and the two screws attaching the distributor to the heater case.
  6. Disconnect the temperature door cable. Carefully fold the cable back and out of the way.
  7. Remove the three nuts from the engine compartment side of the distributor case and the screw from the passenger compartment side.
  8. Remove the heater case and core assembly.
  9. Remove the core retaining straps and remove the core.
To install:
  1. Install the core.
  2. Install the core retaining straps.
  3. Install the heater case and core assembly.
  4. Fasten the three nuts on the engine compartment side of the distributor case and the screw on the passenger compartment side.
  5. Connect the temperature door cable.
  6. Install the defroster duct-to-case attaching screws and the two screws attaching the distributor to the heater case.
  7. Install the steering column.
  8. Fasten all the instrument panel attaching screws.
  9. Install the engine cover.
  10. Install the duct. Install the heater distributor duct-to-case attaching screws and the duct-to-engine cover screw.
  11. Connect the heater intake and outlet hoses.
  12. Fill the cooling system.
  13. Install the coolant recovery bottle.
  14. Connect the negative battery cable.
1990-95 MODELS With A/C

  1. Disconnect the battery ground cable.
  2. Remove the engine cover.
  3. Remove the steering column-to-instrument panel bolts. Lower the column carefully.
  4. Remove the upper and lower instrument panel attaching screws. Remove the radio support bracket screw.
  5. Raise and support the right side of the instrument panel.
  6. Remove the lower right instrument panel bracket.
  7. Remove the vacuum actuator from the kick panel.
  8. Disconnect the temperature cable and vacuum hoses at the case. Remove the heater distributor duct from over the engine hump.
  9. Remove the two defroster duct-to-firewall attaching screws below the windshield.
  10. Under the hood, disconnect and plug the heater hoses at the firewall.
  11. Remove the three nuts and one screw (inside) holding the heater case to the firewall.
  12. Remove the case from the van. Remove the gasket for access to the screws holding the case together. Remove the temperature cable support bracket. Remove the screws and separate the case. Remove the heater core.
To install:
  1. Install the heater core.
  2. Assemble the case and fasten the screws.
  3. Install the temperature cable support bracket.
  4. Position the gasket, then install the case in the van.
  5. Fasten the three nuts and one screw (inside) holding the heater case to the firewall.
  6. Connect and plug the heater hoses at the firewall.
  7. Fasten the two defroster duct-to-firewall attaching screws below the windshield.
  8. Install the heater distributor duct.
  9. Connect the temperature cable and vacuum hoses at the case.
  10. Install the vacuum actuator at the kick panel.
  11. Install the lower right instrument panel bracket.
  12. Fasten the radio support bracket screw.
  13. Fasten the upper and lower instrument panel attaching screws.
  14. Fasten the steering column-to-instrument panel bolts.
  15. Install the engine cover.
  16. Connect the battery ground cable.
  17. Refill the cooling system as necessary.

Posted on Nov 28, 2008

boscia
  • 163 Answers

SOURCE: replace a heater core in 2000 chevy blazer

it is located under the dashboard against the firewall of the passenger seat. i recomend buying a repair manual from your local auto parts store before attempting as it requires draining, flushing, refilling and bleeding the cooling system as well as removing many other componets like the entire dashboard and thermostat

Posted on Dec 01, 2008

  • 61 Answers

SOURCE: how to replacemy heater core in a 92 chevy caprice

with or with a/c

Posted on Dec 13, 2009

Jim1969pa3
  • 152 Answers

SOURCE: I have a 1999 chevy silverado and I need to change heater core

Not a whole lot different. Just need to keep removing plastic down at the heater until you get to the heater core. Then disconnect it on the firewall side.

Posted on Dec 22, 2009

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These will help.

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  1. Drain the engine coolant.
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  3. Remove the outlet heater hose from the heater core.
  4. Reposition the inlet heater hose clamp at the heater core.
  5. Remove the inlet heater hose from the heater core.
  6. Remove the screws that retain the cover to the heater case assembly. This is located underneath the dash on the passenger side.
  7. Remove the straps that retain the heater core to the heater case assembly.
  8. Remove the heater core from the vehicle.

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Heater Core Removal & Installation To Remove:
  1. Drain the engine coolant.
  2. Release and reposition the outlet heater hose clamp at the heater core.
  3. Remove the outlet heater hose from the heater core.
  4. Release and reposition the inlet heater hose clamp at the heater core.
  5. Remove the inlet heater hose from the heater core.
  6. Remove the screws that retain the cover to the heater case assembly.
  7. Remove the straps that retain the heater core to the heater case assembly.
  8. Remove the heater core from the vehicle.
To Install:
  1. Installation is the reverse of removal.
  2. Refill the cooling system.
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