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Repalcing heater core - 1998 Toyota Camry

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Don't replace it until you have checked it out. It might be a bad heat valve on the heater hose, the control to the valve may not be opening/closing it, there might be air in the hoses, the antifreeze level may be to low to supply the core...

Posted on Jan 13, 2013


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get a Chilton's manual for your vehicle. they have step by step instructions for removal and reinstall.

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Heater core leaking through floor vents.

Bad heater core you will need to replace it. About a 2 hour job, very easy to do:

Remove the HVAC module assembly. Refer to HVAC Module Assembly Replacement.
Remove the HVAC filter cover.
Remove the heater core/evaporator tube seals from the module.
Remove the heater core cover screws (1).
Remove the heater core retaining screws (1).
Remove the heater core retaining straps.
Remove the heater core.
Remove the rubber seals from the inlet/outlet pipes of the heater core.

Installation Procedure

Install rubber seals to the outlet/inlet pipes of the heater core.
Install the heater core to the module.
Install the heater core retaining straps.

Install the heater core retaining screws (1).
Install the heater core cover.

Install the heater core cover screws (1).

Install the heater core/evaporator tube seal from the module.
Install the HVAC filter cover.
Install the HVAC module assembly. Refer to HVAC Module Assembly Replacement.

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I have a 97 Tahoe. No heat comes out when I sit idle, when I start driving it starts to come out luke warm only, when I turn the fan on high it starts to blow cold air again wether I am idle or driving. ...

hi, there could be two things, one is that you may have a going bad water pump if you haven´t replaced it in the last 3 years then i recomend you to do it, if you do repalce it in less that that time then you may have a bad heater core, but that is a pain to replace so i recomendo you to take it to a local shop to repalce it for you, hope this helps.

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Leaking heater core~how to find the core?

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.
f74-01.gif 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.

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Here you go, Good Luck !! Click on link & scroll down a ways. Any picture will expand if you click on them.

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Water Retention

I am sure the pressure test will show the location of the leaks, also no explorer does not have a rear heater core.

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