Question about Mitsubishi Eclipse

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No heat. Heater core was replaced, all new hoses, system flushed. When the heat is turned on (vehicle up to temperature), there is a quick burst of heat, then cold air.

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  • SkydvrA35591 Dec 10, 2008

    Yes, originally there wasn't one.
    Installed a new one too.

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HAVE YOU CHECKED YOUR THERMOSTAT

Posted on Dec 10, 2008

  • anitamustang Dec 10, 2008

    SORRY, GOOD LUCK HOPE YOU FIND A SOLUTION

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It is probably not the heater core do to most times when the heater core goes bad it stars putting water into the interior of the car. It may be the heater core supply valve or the blend door actuator is not working. Try warming the Vehicle, then carefully feel the heater hoses, are they both hot? If one is cooler than the other, You need to flush the core, or do a replacement job on the heater core. Also if the system has a heat control valve on the heater hose, make sure it is working! Also check the thermostat, and the temperature blend door, thats under the dash, in the heater plenum. You can flush this yourself, buy the prestone flush kit and install the tee in the heater return line. Disconnect the heater hose at the waterpump, clamp the hose in back of the tee you installed and back flush till it runs clear.20 mins or so.

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A quick check of the heater core is to feel both heater hoses after the engine has fully warmed up. If both heater lines are hot, the coolant is circulating. If one feels cooler than the other, flushing it backwards with a low volume garden hose might help, unless there is a water valve in one of the lines that is closed-only some have a valve, not all cars. Pull the hoses off and try it. Some have even used an air compressor blow gun. If a lot of crud comes out, you may have fixed it.
Sometimes, the older cars get, the rubber seals on the heater case deteriorate, so cool air can sneak in and the heater just doesn't work as well. Big job to fix that. Try flushing the core if you think it needs it, and check heater case doors operation-maybe the temperature blend door is not opening fully.

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How do you install a heater core for a1991 Mazda Navajo


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Feel the heater hoses under the hood when the vehicle is warmed up. They should both be warm.
You may also have a valve that shuts off the coolant flow on the heater hoses. The valve may be faulty.
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What is the coolant temperature after it has been running?. If the temperature is normal and you still have no heat there may be a blockage in the heater core. I would recommend reverse flushing out the heater core to try and dis-lodge whatever may be clogging it and see if that helps.

To reverse flush it just dis-connect the hoses to and from the heater core, hook a garden hose up to the oultet side, and turn on the water.

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1 Answer

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If your vehicle is not leaking or overheating(coolant level is fine) and there is no smell or fluid in the floor board, then the heater core is not leaking(most likely) but it still maybe clogged. Find the heater core lines, they run from tthe engine into the firewall, with the vehicle running and at operating temperature feel of both hoses, they should be warm to hot, if one is and the other isn't then you have a clogged heater core. If this is the case turn off the vehicle and let it cool down then pull the two hoses check to make sure there is no blockage in the hoses then use a hose and flush it through the heater core and see if anything comes out, this should clear out the heater core. If water will not come out of the other side of the heater core it is definitely clogged try flushing through the other way, if water still wont pass through you may need to pull the heater core from behind the dash and try to clean it or replace it. This is where I would begin.

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3 Answers

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Just because the heater core isn't ruptured or leaking doesn't mean it's allowing coolant to pass through it effectively. If you can confirm the engine is reaching the proper operating temperature you should back flush the heater core. If you can reach the hoses going into the firewall try and touch them. One will likely be very hot and the other cool too the touch. That is an indication that the coolant isn't flowing through the heater core because of a clog. Drain the coolant or pinch off the lines so you don't loose all the coolant. Remove the coolant lines to the heater core and using a garden hose flush the heater core out in both directions. Reinstall the hoses, fill up the coolant and run the engine until it warms up with the heat on.

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1 Answer

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Hi,

You haven't said what is actually wrong with the heat system (there can be several different failures). For the time being I'll assume the fan blows plenty of air but the air is always cool/cold regardless of where the heat temperature selector is positioned.

The most common cause on these cars is a plugged heater core. With the engine at normal operating temperature, feel the heater core hoses (under-hood, mid/lower portion of firewall, access from passengers side). They should both be very warm. If not expect blockage in the heater core.

While a replacement heater core along with a good cooling system flush is the ultimate cure, reverse flushing the heater core will restore heat. This can be accomplished with a garden hose. Disconnect both heater core hoses (not with the engine hot as the coolant get very hot!!) and connect a garden hose. Turn on the water supply to flush the core. Flush the core in both directions (by hooking the hose to one side of the heater core and letting the water run, then disconnecting and connecting to other side of the heater core...). An old garden hose with end cut will work fine if your existing hose will not fit over the pipe (plumb it together anyway you can).

The heater core sits rather low in the cooling system. This means crud in the system will settle there eventually causing blockage. If you flush the core the crud will eventually cause blockage again. Reflushing will work over and over again if saving money is the primary goal.

If this is not the problem, the blend air door is probably not working.

Reply and we'll continue. I don't want to repeat things that have already been done, as $2000 should of covered both things I have mentioned.

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1 Answer

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