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Re: My 1998 dodge ram 1500 heater wont blow hot air I...
Check to see if both heater hoses are same temp when engine is at normal running temp if not heater core not flowing coolant may need to flush also make sure it does reach normal temp around 200
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How hot is the engine running in degrees f? Does the radiator fan run?
With hvac turned on, check voltage and ground at the blower motor. If good voltage and ground, suspect the blower motor is faulty.
You can try replacing the water pump, but your heater core isn't fine. Unless you just replaced it. In that case you haven't purged all the air out of it.
It probably low on coolant. The heater will blow cold when there is not enough water (coolant) to keep the heater core full. Check the radiator (not the overflow reservoir) when it's cool.
is the engine block and rad and heater core all full of coolant?there may have somw air trapped somewhere so the system is not full.if thats the case then the heater wont circulate the proper amount of coolant hence no heat.make sure all the air is out of the system
I have the same truck, I have flushed the radiator both ways, flushed the heater core both ways flushed the engine four times, I have owned this truck for eight years and still cannot get it to heat up the cab. It will keep the windshield defrosted but that is all. If you find any tricks to fix this let me know PLEASE
Why was radiator replaced?Did it have heat before ? If it was plugged, the heater core may also be plugged. Try flushing it with a water hose in both directions. I dont know why the botton radiator hose would be cold, the radiator should be a uniform temp and the air coming through the radiator should be HOT, when the engine is at operating temp. What condition was the old coolant? if it was rusty, the water pump may have lower flow than normal.
are heater inlet outlet mix valves standard for all dodge heater cores. I have 2001 dodge cummings blows warm air not hot when gauge is 195 degrees would there be a mix valve under the dash because it is not inline outside the wall
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