Question about 1986 Ford Mustang

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86 mustang fuel gauge does not work after replacing heater core. there is a harness that comes thru the firewall on the right side and single black wire that separates from the harness and not sure what that hooks up to. all of the other wires are hooked up and ok. would like to know what the black wire's use is.

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Black is almost always a ground wire

Posted on Jun 21, 2009

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1 Answer

How do I replace the heater core?

most cars and trucks now have the a/c and heater core behind the dash - the dash has to be taken out to get to the heater core look to see where your heater core hoses goes thru the firewall - if it is directly behind the motor your heater core is on the other side of the firewall

Apr 24, 2015 | 2005 Buick LaCrosse

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Heater core

There's two hoses that run from the front of the engine to the firewall; those tubes sticking out through the firewall are your heater core connections. You'll have to pull the dash out to access the heater core for replacement; once you get the dash out you should be able to figure the rest out.

Aug 02, 2012 | 1989 Ford Mustang

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Dodge Ram 1500 - I have no heat. Will replacing the thermostat slove this? If so how do I replace the thermostat?

Hello, No! I'm assuming that the temp gauge is working in truck & you are not over heating. On the passenger side firewall check both hoses going to/from heater core. If both are not warm then it is probably a heating core plug. You will have to replace the heater core.

Jan 06, 2010 | 1996 Dodge Ram 1500 Club Cab

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Need more detailed Instruction on how to replace heater core

Once again you have an ALL DAY JOB ahead of you. YES, You have to remove the "whole dash".

However, Sometimes you can get LUCKY and only unbolt it without pulling all the wires and cables and junk and it will come back just far enough to be able to remove the heater box.

NOTE: I have found that on SOME Ford models.,:

They install the heater core in the interior plastic housing and mount it on the firewall with the studs protruding thru the firewall then they put on the NUTS from the engine compartment side onto the bolts to hold the assembly onto the firewall.

Then when they mount the engine compartment housing OVER these same studs that protrude thru the firewall and then they install a SECOND NUT to hold the firewall compartment on.

So you have 2 nuts on the same bolt. Therefore you have to take the engine compartment side housing side off FIRST and then you will see the set of NUTS that hold the interior housing onto the firewall,

Oct 18, 2009 | 1993 Ford Escort 4 Door

1 Answer

2005 f350. Heater works but can't get air to flow out of leg vents....even when specifying leg vents on instrument panel.

If air is coming thru defroster then you have a vacuum leak.Defrost is the default postion(no vacuum).Look under hood on the passenger side next to heater core area and see if you can find the small black vacuum line going thru the firewall.Trace it back to the vacuum canister on right side of engine or fender well and make sure nothing is disconnected or leaks in the line and trace it from canister back to the source also.

Mar 02, 2009 | 2005 Ford F 350 Super Duty

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How to remove heater core

On the firewall on the passnager side find the heater core feed and return hoses (bkack in color and usually have a clamp or two on them. remove the hoses and replace with a single piece by-passing the heater core.

Feb 01, 2009 | 1998 Cadillac DeVille

1 Answer

Removing the heater core from 2000 silverado

When I replaced the heater core on my 95 Suburban, I seem to remember having to disconnect the A/C lines on the firewall for the evaporator. There were also several nuts to remove on the engine firewall side from studs on the heater box that pass thru the firewall. It is definately a lot of work.

Good luck.

Jan 10, 2009 | 2004 Chevrolet Silverado 1500 Crew Cab

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How to replace heater core 93 honda del sol

Heater Core Honda Civic/CRX/del Sol 1984-1995 Repair Guide REMOVAL&INSTALLATION
See Figures 1, 2 and 3
  1. Disconnect the negative battery cable and disable the SRS system (if equipped.)
WARNING All SRS wire harnesses are covered with a yellow insulation. Read the SRS precautions found in this section and install the short connectors as described.
  1. Properly drain the cooling system.
  2. Disconnect and plug the heater hoses at the firewall.
  3. Disconnect the heater valve control cable.
  4. Remove the heater unit attaching nut on the firewall.
  5. Remove the dashboard as follows:
    1. Remove the center panel.
    2. Disconnect the wire connectors at the fuse box.
    3. Disconnect the sunroof switch connector, if equipped.
    4. Disconnect the ground cable at the right of the steering column and the power mirror switch wire connector.
    5. Remove the side air vent knob and face plate.
    6. Remove the screws attaching the air vent control lever.
    7. Remove the center panel, radio and heater control head.
    8. Remove the gauge upper panel (4-door) or instrument panel (3-door).
    9. Disconnect the speedometer cable.
    10. Remove the center upper lid.
    11. Remove the side defroster garnishes on both ends of the dash.
    12. Lower the steering column.
    13. Remove the dashboard mounting bolts.
    14. Lift and remove the dashboard assembly.
  6. Remove the heater duct.
0900c15280061a21.jpgFig. 1: Removing the heater duct assembly
  1. Remove the steering column bracket and duct assembly.
  2. Remove the heater assembly mounting bolts.
  3. Remove the heater assembly and remove the heater core.
0900c15280061a22.jpgFig. 2: Removing the heater case assembly 0900c15280061a23.jpgFig. 3: Removing the heater core from the heater caseTo install:
  1. Install the heater core into the heater unit.
  2. Install the heater assembly and the attaching bolts.
  3. Install the heater duct and steering column bracket.
  4. Install the dashboard assembly. Tighten the mounting bolts until just snug.
  5. Raise and attach the steering column.
  6. Install the center upper panel.
  7. Connect the speedometer cable and install the instrument gauge assembly.
  8. Install the control head, radio and center panel.
  9. Install the side vent and face plate.
  10. Connect the ground cable at the right of the steering column and the power mirror switch wire connector.
  11. Connect the sunroof switch connector, if equipped.
  12. Connect wire connectors at fuse panel.
  13. Install the heater unit attaching nut on the firewall.
  14. Connect the heater valve control cable.
  15. Connect the heater hoses at the firewall.
  16. Connect the negative battery cable.
  17. Fill, bleed and leak check the cooling system.

Sep 01, 2008 | 1996 Honda Accord

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