Question about 1986 Toyota Cressida

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Heater Core Leak

The heater core in my 86 cresssida is leaking and in the past the previous owner re-routed the tubes straight back into the engine. I can not figure out how to remove the heater core? Also i was woundering if there was an eadier way to change the core without completley gutting my dashboard?

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  • Anonymous Mar 16, 2014

    do I have to remove a lot of covers



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Dash has to come out. Sorry.

Posted on Jan 09, 2009


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1 Answer

My heater doesn't work on my 2000 Intrigue. The blower works and it doesn't overheat. What could be the problem

There are two reasons that could be the cause. The most common is that the blend door in the heater control box is non-operational and is not routing the air from the blower through the heater core. The other possibility is that the heater core is clogged and not getting coolant flow. Actually, a third (more remote) possibility is that if the car is used, a previous owner may have bypassed the heater core if it was leaking. You would have to check the heater hoses under the hood to make sure they are being routed through the firewall and not connect to each other, bypassing the heater core.

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Heater Core

Hi.. The same DRAIN for the A/C use the HEATER.
The HEATER core in your car is Spensive work.
Because is nessesary to REMOVE the INstrument panel.
If you DON'T use offten the HEATER.
I recomend Make a BY PASS. On the Heater tubes.
Or using a Hose routing from one outtlet to the other one.

I hope this help on your problem.

Thank you for use fixya...

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Either a hose isn't tight or has a crack in it. You could also have a defective heater core.

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Your heater core has developed a leak - the wetness on the passenger side carpet is engine coolant
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Your strategy: disassemble dash down to heater core, determine whether you'll need a new heater
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Water leaking out of overflow from heater core.

If coolant is leaking from the heater core into the interior or through a weep hole out of the car your heater core has sprung a leak.
Most vehicles have easily accessible heater cores, only requiring removal of a panel under the dash or hood to gain access. On the '97 Skylark it's accessible under the dash.
  • Disconnect the negative battery cable.
  • Drain and recycle the engine coolant.
  • Raise and safely support the front of the vehicle.
  • Detach the drain tube, then disconnect the heater hoses from the core tubes.
  • Carefully lower the vehicle.
  • Remove the console if equipped.
  • Unfasten and remove the sound insulators, console extensions and/or steering column filler, as required.
  • Remove the floor or console outlet ductwork and hoses.
  • Remove the heater core access cover.
  • Unfasten the heater core mounting clamps/bolts, then extract the heater core from the vehicle.

To install:
  • Install the heater core, then secure using the clamps/bolts.
  • Fasten the heater core cover.
  • Connect the outlet hoses and ducts.
  • Install the sound insulators, console extensions and/or steering column filler.
  • Raise and safely support the vehicle.
  • Install the drain tube and connect the heater hoses to the core tubes.
  • Carefully lower the vehicle.
  • Connect the negative battery cable.
  • Fill cooling system and check for leaks. Start the engine and allow to come to normal operating temperature. Recheck for leaks and check coolant level. Add if necessary.

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It sounds like you probably have a leak in your heater core. Replacing a heater core can be a difficult job. If you decide want to try it I suggest you get a shop manual to help you out. I can give you a relatively easy temporary fix that will stop the leak until you have more time to fix it or you can take it into a shop to have it done. The down side is this fix will temporally disable your heater. Wait for the engine to cool. Open the engine compartment and look all the way in the back between the engine and the firewall. Find the 2 heater hoses that pass through the firewall. They should be about 1 inch in diameter. Undo the hose clamps and disconnect them from the firewall. Get a short piece of metal tubing about the thickness of the inner diameter of the hoses. Use this metal tubing to connect the heater hoses together and clamp them using the two hose clamps. Now the antifreeze that would normally circulate through your heater core will instead circulate through this loop and not enter the passenger compartment. If you can't find a short piece of metal tubing to do this fix you can completely remove one of the heater hoses. Then take the other heater hose and connect it to location near the engine where you disconnected the first hose. Save the first hose so you can hook it up later when you do the more permanent fix. Make sure to position all hoses such that they aren't resting on any hot surfaces. I hope this advice helps you out.

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1 Answer

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first check to make sure that the hose,s back there didn't crack / of there fine then the heater core has blowen open and is know leaking / if you are in an aera that diesn't get real cold take the hoses off and route one to the other till you can get it fixed

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My 1996 Cadillac Sedan Deville heater blows cool air and engine is running at normal temps. It never seems to get up to temperature.

If you are not the original owner, the previous owner may have bypassed the heater core. The heater core is like a small radiator that has hot water running through it from your motor. It is inside of your dash board, near your a/c and heater controls. That is how yur car gets hot air. The air runs through the heater core making it hot. Bypassing it is a cheap and quick fix for a leaking heater core. When they get a leak, they leak all inside the car down to the floor board. Check under the hood along the fire wall. If it is bypassed, you will see two hoses spliced together. One will be bigger that the other slightly. If this is your problem, you are more thatn likely need to replace your heater core

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check closer to just underneath the firewall--it could be a smaller problem than a heater core--Ford 4.6--5.4 engines have a tube just underneath the intake manifold that the rubber hose goes bad and it will leak towards the back of the engine.Lets hope so-what i hear its very expensive to change a heater core in an Expedition.

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Make sure that you have 2 heater hoses going into the dash. These are 5/8" hoses coming from the water pump and going into the top of the engine. The 2 hoses go through the firewall into the heater core. If you don't have the 2 hoses going to the heater core, the previous owner may have it routing itself back to the engine. It the hoses are routed back to the engine, there's a chance of the heater core being bad as well and this is why it's by-passed.

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