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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Posted on Dec 10, 2008

  • anitamustang Dec 10, 2008




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How do i change 92 chev luminas heater core

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.

Sep 15, 2014 | 1992 Chevrolet Lumina

1 Answer

Flush clogged heater core

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.

Dec 26, 2013 | Saturn S-Series Cars & Trucks

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How do you install a heater core for a1991 Mazda Navajo

remove dash assembly try to back flush first or drain cooling system put water back in add cascade dish washing soap and drive a couple days if heater starts woreking better turn heat on high run engine open drain with a hose nozel on high and a large pan under drain flush all water out with engine running refill system with heat on high and vehicle running if heat still weak remove heater hoses the top should be the return line put a hose about 8 inces long on both out lets run the bottom hose to a high area where it can be suspended put a funnel in upper hose poor clr into hose until it comes out top of lower hose let set for hour and a half then flush out with water into a clear jug flush water vthrough upper hose then if u have air compressor have a 6 inch hose attatched to upper pipe and blow out core into same jug until the jug has clean and clear water refill cooling system and drive if heat doesnt work at first put engine under a load to release residule deposits in heater core and it should start flowing

Apr 01, 2012 | Cars & Trucks

1 Answer

No heat in car..thermostat new,flushed system,flushed heater core..still no heat

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.
If both heater hoses are warm up near the firewall where they enter the vehicle then you might have a bad solenoid or switch that is not operating the blend air door that moves between the A/C evaporator and heater core.

Oct 27, 2011 | 2000 Buick LeSabre

1 Answer

2003 madza protege5 hear does not work replace and flush out the system and changed out therostat heater core does not leak nor fogg the windshild still no heat from the vents only slightly warm air out...

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.

Dec 13, 2010 | 2003 Mazda Protege

1 Answer

2001 rx300 no heat from heater

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

Heater not working

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.

Jan 02, 2010 | 1997 Pontiac Grand Prix

1 Answer

The heat system is broken


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.

Nov 19, 2008 | 1999 Ford Taurus

1 Answer

2000 s-10 the blower works but no heat comes out the vent. where do i start?

First thing to check is the coolant level. The heater is the lowest priority of the cooling system so if there isn't enough coolant, none will flow through the heater core. If the radiator is full, the next thing to check is coolant flow through the heater core. The easiest way is simply by "feel" and here's how: Open the hood and identify the heater hoses by locating the two smaller coolant hoses that attach to ports at the fire wall. Once you identify them, start the engine and allow it to warm up to normal operating temperature. (195 to 200 degrees F or just under 100 degrees C) Now turn off the engine and feel the two hoses one at a time as close to the fire wall as possible. If one is warm or hot and the other is cool or cold then there is an obstruction in the heater core. If there is an obstruction in the heater core, you can usually back-flush it and clear it out. To back flush it you have to identify coolant flow direction, if you have identified a cold hose with the previous test, then that's the coolant outlet of the heater core, to back-flush, you would force water into the outlet, and watch for the obstruction to be blown-out of the inlet. Usually garden hose pressure is sufficient, but don't apply more force than the pressure maximum specified on the radiator cap! (Usually 15-17 PSI) You can burst a heater core with too much pressure, then you'll enjoy all the fun of removing the entire dash panel from your vehicle so that you can access the heater core case. If it is totally clogged up there may be no hope of clearing the obstruction, and replacement will become necessary.(which makes dash panel removal necessary too!) If the heater core is not obstructed and both hoses are the same temperature, the climate control system is not directing airflow through the heater core. The air diverter door may be cable or servo-electrically operated. Again access to the heater case may become necessary to service the air diverter doors. ( I wouldn't recommed anyone other than a skilled professional for dash panel removal and replacement because there are a lot of nuts, bolts, screws wiring connectors, vaccum hoses and possibly cables to deal with, not to mention engine coolant and air conditioner refrigerant in cars with A/C! ) Good Luck!

Oct 30, 2008 | 2001 Chevrolet S-10

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