I have a 2000 grand cherokee 4.7 its has reently started overheating but heater is blowing out only colder air.
Generally this condition is the result of coolant loss, or failed thermostat. If coolant goes below cylinder head level, or thermostat remains closed,heat will stop working. Do not drive with this condition as excessive heat buildup in cylinder head can and will do serious damage to heads and or head gasket.
Find out where leak is and correct it. Change thermostat as it may also be damaged. Check for excessive steam from tailpipe or miss in engine, as these symptoms indicate a cylinder head problem.
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tks for your input i made the mistake of not burping the system when i added some coolant recently.burped it and at least so far it seemed to solve the problem.again thanks for your comments/etc.
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