Question about 1997 Hyundai Elantra

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No Heat Change thermostat on hyundia elantra and still no heat, cool air stills blows after the car is running at normal tempature.

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Hi this sounds like the elec operated coolant control valve has failed? common fault on ford models however to confirm this? if you warm engine to normal then turn temp setting to full hot do not put fan on yet! locate the heater hoses from engine to point they go into bulkhead of engine bay? feel each hose for heat ? if one is warm/hot and other much cooler/cold ? then cooler valve is not opening so coolant can flow thro heater matrix inside car understand?? unfortunate;y this valve is not servicable but is easy to change and not too expensive ? its location is normally at point prior to entering car interior and you will find it if you follow heater hoses? it may well be in bay below the grill below w/screen is normally plastic renewal will be apparent when you see it ? hope this helps ? just one point all above is on assumption you have checked radiator coolant level is topped up ?? if not this will also give no heat thro heater ? if very low

Posted on Oct 28, 2008

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What causes hyundai Elantra 2002 tempature gauge fluctuates between normal and hot


The thermostat "seals" the cool coolant giving up (rejecting) heat in the radiator & heater core from the hot coolant absorbing heat in the running engine "block".

When the coolant in the engine reaches a specific temperature (180 ~ 195 degrees) as determined by the value selected by manufacturer or when replaced, it opens and allows the hot coolant in the engine block to be pumped out to the radiatot & heater core for cooling and the cool coolant in the radiator / heater core is pumped into the engine block - replacing the hot coolant. The thermostat senses cool coolant in the engine block and seals shut until the temperature of the coolant in the engine block rises to 180 ~ 195 degrees again. This process continues over and over for as long as needed.

You should check to make sure that the coolant level in the reservoir / radiator is sufficient by checking when cold. Do NOT remove a radiator cap when it is hot! With the cap off, start the engine and add additional coolant as the engine warms up to normal operating temperature. If coolant levels are ok, the trouble could be related to the thermostat or possibly a faulty temperature sending switch. This means that the temperature of the coolant is fine - but the switch or sensor that converts the temperature to a voltage for the gauge on yur dashboard is the problem.

If the temperature is fluctuating up and down, you should have it fixed. Good luck!

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