How do you take out the heater core in a 1990 thunderbird?

https://www.bing.com/videos/search?q=how+to+change+a+heater+core+on+a+2002+ford+thunderbird&qpvt=how+to+change+a+heater+core+on+a+2002+ford+thunderbird&FORM=VDRE

Hope this helps

You will need to get a service manual as it is too complicated a job to advise here.

Please click on the link below and get the complete guide to remove and install heater core on 1995 ford Thunderbird :----- http://technoanswers.blogspot.com/2011/03/how-to-replace-heater-core-on-1995.html ------------ This should help.Thanks.Helpmech.

Inspect/Replace If it is necessary to remove the heater assembly, the cooling system must be drained before removing the heater core.
When a heater core leaks, a new heater core is installed or the old one repaired.
Heater Housing

• The heater housing is usually under the dash and must be removed to gain access to the heater core.
• Procedures for replacing the heater core vary with the year, make, and model of car. It threfore necessary to consult the manufacturer's repair manuals for the proper procedure for replacement.

The heater housing is disassembled to get to the heater core. Heater Core

• Remove the access panels(s) or the split heater/air conditioning case to gain acess to the heater core.
• Remove the heater coolant hoses.
• Remove the cable and/or vacuum control lines (if equipped).
• Remove the heater core securing brackets and/or clamps.
• Lift the core from the case. Do not use force. Take care not to damage the fins of the heater core when removing.
• To reinstall the heater core, reverse the removal steps.

When the heater core leaks and must be repaired or replaced, it is a very difficult and time-consuming job primarily because of the core's location deep within the firewall of the car. For this reason always leak test a replacement heater core before installation.

Heater Core Removal

1. Partially drain the cooling system.
   

1. Remove the tube gasket from the heater core tubes.
   

1. Remove four heater core access cover retaining screws and remove the access cover from the A/C evaporator housing (19850).
   

1. Remove A/C electronic blend door actuator.
   

1. Slide heater core (18476) and seals from the A/C evaporator housing.
   

Installation

1. Install the heater core in the A/C evaporator housing with the tube gasket on the outside of the case.
   

1. Install A/C electronic blend door actuator as described.
   

1. Position the heater core cover on the A/C evaporator housing. Install the four retaining screws.
   

1. Refill the cooling system.
   
   
   
   
   
   
   
   Item Part Number Description 1 18596 Heater Core Tube Gasket 2 18476 Heater Core 3 18B300 Heater Core Cover 4 390747-S2 Screw (4 Req'd) 5 18N267 Heater Core Cover Seal
   
   
   Hope this helps... Cobra
   

Section 12-03A: Air Conditioning System—Manual A/C-Heater 1996 Thunderbird, Cougar Workshop Manual REMOVAL AND INSTALLATION Heater Core Removal

1. Partially drain the cooling system.
   

1. Remove the tube gasket from the heater core tubes.
   

1. Remove four heater core access cover retaining screws, and remove the access cover from the A/C evaporator housing (19850).
   

1. Remove A/C electronic door actuator.
   

1. Slide heater core (18476) and seals from the A/C evaporator housing (19850).
   

Installation

1. Install the heater core (18476) in the A/C evaporator housing (19850) with the tube gasket on the outside of the case.
   

1. Install the A/C electronic door actuator as described.
   

1. Position the heater core cover on the A/C evaporator housing (19850). Install the four retaining screws.
   

1. Refill the cooling system.
   
   
   Heater Core
   
   
   
   
   
   Item Part Number Description 1 18596 Heater Core Tube Gasket 2 18476 Heater Core 3 18B300 Heater Core Cover 4 390747-S2 Screw (4 Req'd) 5 18N267 Heater Core Cover Seal

do you mean the FAN, could be the switch controling the fan. try that first, pulling the fan motor and heater core will be a pain.

I think a picture is all you need with your credentials.

Pull the panel under the glove box. You should be able to see the heater core. disconnect the two hoses under the hood on the firewall to the heater core. put a pan below to catch the antifreeze. Replace heater core. reconnect hoses.

I believe this is the easiest heater core ever invented. If it is like the 1986 model. I believe it is. You take out the glove box door. The heater core is right there under a cover in the duct work.