I would try replacing the engine thermostat it’s the cheapest place to start if that doesn’t get you any heat it’s possible that your heater core could be plugged
SOURCE: heater only blows cold air but hoses are hot
Hi!
It
appears we have an Air lock scenario and you will need to perform a
system Bleed.
Park
the vehicle on level ground, when cold remove coolant filler cap,
start engine and leave to idle, turn heater on full and blower to
max. When engine reaches operating temperature watch and listen near
coolant filler, keep clear as gurgling and hopefully a boil over
should occur. Top up with very warm coolant and wait as it may do it
again.
Check
for heat inside vehicle if warm replace coolant cap but keep an eye
on temperature gauge as the ~Air lock may have moved on from heater
matrix/core so proceedure needs to be carried out again from COLD.
If
persistent boil ups/over attention must made in the cylinder head
or
gasket area, or possibly water pump?
Please
press the Blue button to appraise my FREE Efforts, Thank You!
Paul
'W' U.K
SOURCE: My 2002 Avalanche 1500 4WD is not blowing hot air
Gas. Haven't dropped any pencils down the defroster vents have you? Sounds like a mixing door in the heat/ac box is not moving. Could be the motor to the door or a lack of vacumn to the controls. Make sure your canister under the hood is hooked up(probably is since you did not mention having defrost air only). If it has a cable instead of vacumn control for temp, verify it is connected and operating properly. TJ
SOURCE: 2002 dodge 1500 Changed radiator, thermostat, and hoses. No heat
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.
SOURCE: 2002 Dodge Ram pickup heater and defroster blows
sounds like it could be a mode door actuator problem which directs the flow of air in the heater case,
SOURCE: 2002 Dodge Neon cold air from heater. fan works,
YOUR HEATER CORE NEEDS REPLACED ITS LOCATED IN THE UNDER DASH PANEL ON PASSENGER SIDE.
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