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My 1992 sonata 5 sp manual has coolent coming out of the heater causing it to over heat.it appears that the heater is leaking as coolent is on the floor of the passenger seat and drivers side.i was wondering how to block the coolent flow to the heater? this will cheaper than replacing the heater.
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Didn't see any leaks, because all the coolent has already leaked out. 100% sure if you let it cool down, fill it up with coolent and restart it, you will soon find your leak. (if you don't find the leak just by adding coolent) Im willing to bet its your lower or upper radiator hose.
Your heater core is leaking. Will not defrost because the moisture leaking out of the heatercore is just refogging up your windows. Replace the heater core. Feel your floorboards, espically the passenger side and see if its wet. Check and see if coolent lvl is low. Im 98% sure if you let your engine get to operating temp, and get down in the passenger floorboad and look up under dash, you will see the coolent spraying/leaking out. Sorry to be the bringer of bad news, they are always hard to replace.
Possible causes include low coolent level ( I know it sounds wrong, but if the coolent level is low hot coolent won't circulate to the heater core)
The thermostat may be stuck open, if it is the engine won't reach proper operating temp. Only solution is to replace, but it is easy to do and thermostats are inexpensive.
Heater core may be plugged, this is more likely if stopleak has ever been used to stop a radiator leak. Solution would be backflushing the heater core.
The valve that controls the flow of coolent to the heater core could be stuck or defective or the vacuum switch that controls the valve might be defective.
yes, the heater core is leaking coolent and when the heat is turned on , the evaporated coolent is what is steaming your windshield. Replace the heater core to solve this problem.
Your collant level is insufficient ( too low a level ) to deliver hot coolent to the heater core....
Check coolent level in overflow bottle... it should read full....
OR
Your thermostat is frozen open not allowing the coolent to sufficiently heat up ...
you can find the coolent lines into the heater through the fire wall disconect them and put pressure through the core to see if its clogged other than that possably a coolent flush cause stuff builds up in the antifreeze and clogs the lines. your heater uses the heat from the engine coolent to heat the air in the heatercore so naturally if you got bad coolent you got heating problems too
Is the fan working and blowing air but there is now heat?
If there is no heat and air is blowing out check your radiator level. If the engine coolant is too low water will not get to your heater core. Remeber check the radiator level and not just the coolant reservoir. Becareful when working around a hot car. wait til the car cools down to check the level of the coolant in the radiator.
Yes open the plastic valve on the top in pipe to the heater while the engine is not running air will be expelled retighten and start run till temp gauge half way up the dial if this does not happen then its the Thermostat hey presto heat should make toast
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