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Heater Cores and Blower Fans
Mazda 323
Ford Explorer Limited
Car Heaters

Your heater heats when air is being recycled but as soon as you open fresh air valve it turns cold The thermostat and coolant has been flushed and changed This is on a 1993 Mazda 323?

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Wiki User
2006-02-21 11:55:28
2006-02-21 11:55:28

sounds like you need a new heater matrix.

1

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flush the system and change thermostat,this should fix problem. I flushed mine and i changed coolant and thermostat,it is now fine.

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There could be many reasons. Not enough coolant or bad flow, faulty thermostat, low oil. If the coolant freezes then it will overheat. If your car continues to overheat then you should have the coolant flushed and thermostat replaced.

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THe fluid will need flushed and changed.

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Check the temp sender and make sure the wiring is connected. How long has it been since the thermostat was changed and the coolant was flushed? You might try those...or at least a thermostat change. The coolant level is too low, and/or there is not enough water mixed with the coolant.

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Blown head gasket is a distinct possibility, unless you just flushed and changed the coolant. In that case it is trapped air escaping.

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Low coolant? System air bound? Hoses collapsing under pressure? Water pump not circulating coolant?

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is your car equipped with a coolant overflow bottle replace thermostat have radd removed flushed and rodded

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If your radiator isnt leaking and car is having a over heating problem and coolant spewing out. Chances are your thermostat needs replaced. possible the radiator needs to be flushed. But more likley its thermostat

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Yes, this sounds like coolant from a cooling system that has been neglected and not flushed and changed regularly. Have the leak fixed, a new thermostat installed, a fresh mix of 50/50 coolant installed, and bleed the system.

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Sounds like you have a thermostat problem. Have it changed and have the cooling system flushed and refilled with fresh coolant. That should cure the problem.

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have you flushed your radiator or changed the thermostat it could be stuck

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Hi there, if you have flushed any engine and have changed thermostate there are only two options that are left; (providing that there are no leaks) 1. the thermostat is faulty / 2. your water pump is broken and needs to be replaced

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Make sure you have the correct thermostat in there, if it is set too high you will get that bouncing. The thermostat is set to open at a certain temperature and allow the coolant to exchange with what is in the radiator. Under normal conditions you will notice a rise and fall of the temp gage as the coolant reaches max temp then lowers after the exchange. An overly sensitive sensor or an aftermarket gage set up will exaggerate it. I would not worry too much since it is a good indication that your cooling system is working well, the coolant in the radiator certainly seems to be cooling down enough to cause a big swing in temp. Check on that thermostat though as it may be letting the coolant get too hot before releasing it.

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Nothing to do with the thermostat, everything to do with changing the coolant on the recommended* basis (or sooner). The "green" coolant is NOT long-life and recommended to be changed more often than the "yellow". But even the 'long-life' requires changing no longer than 5 years. NOTE: Both these coolant types are mentioned in the Owners Manuals.

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It sounds like you have a blown head gasket. Combustion gases can enter the cooling system through either a blown head gasket or cracked cylinder head. The gases (under pressure) force coolant out of the reservoir. This also causes a void in the upper part of the cooling system , leaving no coolant at the thermostat and the coolant temperature sending unit. The result is a erroneous temperature Reading and will even prevent the thermostat from opening.

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form_title=Replace the Coolant Fluids form_header=The fluids in the cooling system need to be replaced regularly. When was the last time you go your coolant flushed?=_ If the thermostat needs to be replaced, would you like me to install a new one?= () Yes () No Have you noticed any leaks in your radiator?= () Yes () No

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The defrost is cooing your coolant by circulating the fluids through the heater core. Check the water pump to insure that its pumping and check the radiator for blockages in the fins. Also check for an air bubble that can happen when a thermostat is replaced.

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it could be the thermostat needs to be changed or the heater core needs to be flushed out.these would be the cheaper things to try first.

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It could be one of many things.......radiator fans notworking/low on coolant/stuck thermostat/ radiator may need to be flushed......


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