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I recently had the heater core replaced on my 2000 TJ Sport. the ac system was recharged but does not blow cold. The ac lines under the hood are frosty cold and the condensation comes out the drain tube, but the air from the vents is barely colder than the ambient temperature.
Re: I recently had the heater core replaced on my 2000 TJ...
I would return the vehicle to where the work was done. It sounds like something such as the blend door was not reinstalled properly, or something wasn't reconnected properly.
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the ac core only blows cold air but You must be talking about the heater core.. In which case I would suggest that you bleed the air out of the coolant system as there is an air lock in the heater core.
You need to check the heater core it has two hoses going to it feel of them if one is hot and the other cold heater core is stopped up replace it or flush it out if they are both hot it can be the switch or a vacuum line the vacuum line will be on the passenger side under the hood where the airconditioner hoses go in the body
You may want to check your coolant level, low coolant will not circulate to heater core. You may have a plugged heater core, if you remove the 2 heater lines under the hood these lines i think a 3/4 and go directly into the firewall on the pass side.. take them off drain the coolant and flush it out by putting a water hose to one side and let it drain out of the other line. this is a cheap way to flush a heater core. good luck hope this helps
flushing the radiator changing the thermostate and the heater core will not have any effect to the vehicle AC systems to make the AC systems blow cooler air. you need to have the systems check by the AC shop to check if you have any leaks, it may be low on refrigerant and may just need recharging. any ac shop can tell you exactly what wrong with it and what need to be done. You may have a small leak somewhere causing the ac unit to be low on refrigerant which they can put a die in the systems to detect any leaks you may have.
Have some one watch the heater control valve, under the hood tapped into the feed hose for the heater core, and while you switch from hot to cold they should see movement, if not it has to be checked for vacuum feed and or replaced.
Sounds like a stuck heater core valve. Find heater core valve. Under hood, find the two heater core hoses going into firewall. One of the hoses has a valve. Operate temperature control (full heat, then full cold) check that valve changes position. If not either replace valve or control system failure. Also, when temperature control in cold position, one hose should feel hot and the other cold. Temp fix: disable valve to close no heat or on heat.
THE BLEND DOOR THAT CONTROLS HOT TO COLD SWITCHING IS STICKING. THE CONTORL HEAD IS ELECTRIC AND MAY BE CAUSING THE PROBLEM. HEAT AND AC ARE 2 COMPLETELY DIFFERENT SYSTEMS EXCEPT FOR THE CONTROLLER UNDER YOUR RADIO. HEATER COIL IS REALLY A HEATER CORE WHICH IS A LITTLE RADIATOR INSIDE THE CAR BEHIND THE DASHBOARD.
Have you checked to see if small vacuum line on firewall under the hood is a-ok ( no breaks or cuts) it's usually on passenger side and goes through the firewall to inside. Also I think when the heater core goes out you have no defrost either so when it is cold and wet outside your windshield will fog up.Also did you check your fuses.
Hi There,
If the fan blows only cold air, then you might have a restriction on the heater core. The heater core is like a small radiator inside your dash. The coolant flow through it can be restricted by corrosion. The lack of flow of coolant through the heater core will result in a lack of warm air inside the car. Flushing out the heater core may help. If not, you will have to replace it. I would say though, 80% of the time the cause is just restriction. Get the heater core flushed and I am sure you will get your heat back.
MIke
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