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Answered 2006-11-14 00:01:07

bad fan clutch, clogged radiator.....................when you turn the defrost on, the heater core is acting like the radiator...............good luck, Mike

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The heater core has no gasket. If it is leaking, it must be replaced.


That means either you have air in your heater core or your heater core is being bypassed


Sounds like a heater hose got left loose or maybe one of the hoses are leaking a little.


More than likely its the defrost timer or the defrost heater. You can try and advance the timer which is usually located at the top of the refrigerator compartment. Its usually a small round circle with a slot in the middle. Take a slotted screwdriver and advance it till you hear it click then stop advancing it. This more than likely is defrost mode. It should kick on the defrost heater. Listen closely if you can hear the heater kicking on and sizzling the ice. If you do advance the timer to run after about 1/2 an hour and repeat the process until the ice is gone. If this works then the timer is defective and needs replaced. If this process doesn't work then the defrost heater is probably defective.



1. heat control linkage disconnected or broken or vacuum source problems(low vaccum source or broken vacuum lines) 2. heater unit doors stuck or non functioning heater door actuators


a heater hose runs from intake to heater core to radiator. the heater core is were the heat comes from inside the car as well as defrost


Yes they have a heater/defroster.


ihave a 1986 chevette that when i turn defrost on it blows out heat and when i put heater on it blows out only cold air? ihave a 1986 chevette that when i turn defrost on it blows out heat and when i put heater on it blows out only cold air?


The fastest way to defrost a windshield is to turn the defrost vent on without heat or simply open the windows. Another option is to warm the inside of the car by turning the heater on.


it should if you have the heater control in the defrost position this is to remove the moisture from the air


Blocked heater core, faulty heater valve, disconnected connection to the heater valve.


If your heater core wasn't leaking at the time your radiator was replaced , then ( no ) That would be two separate jobs


Yes, the ac will run in the defrost position to dry the windshield.


Most likely a bad or disconnected vacuum hose to the defrost/floor selector in the heater ducting.


No, the XJ Cherokee does not have the same heater box as a WJ Grand Cherokee.


The most common thing will be that you have a leaking heater core...........


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If defrost is on it could be your compressor going bad. See what happens when you leave off defrost or disconnect your compressor. It only controls defrost and air conditioning. I had the same problem


If the heater does not work, check: -heater fuses and/or any heater relays -heater control head -heater blower motor resistor


It is a strange looking part under the hood tapped into the heater hoses on the left side of the valve cover(when standing by the grille). Between the oil filter and the firewall. It has a vacuum hose coming out of the top of it that goes through the firewall to control the different controls of your heater (eg. vent, heat, defrost)


The compressor is coming on because you have the heater set to defrost. Take it off defrost and the compressor will not come on. I would suspect the compressor is locked up.



Blown Heater Core - The heater fan blows past the heater core and if it has a hole in it your antifreeze ios being blown onto your windshield.



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