Question about 1998 Jeep Grand Cherokee

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Heater problems The heater barely pushes out any warm air. The a/c works just fine. The line running into the firewall doesn't get warm, but is warm further up the line in the engine compartment....any ideas?

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  • baptisedbyfi Dec 09, 2008

    I will try that and see. A mechanic buddy of mine said he thought the line was clogged going into the firewall.



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Check the heater core!

Posted on Dec 09, 2008

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Sounds like you have to much antifrezze in the mix drain about a quart and replace with water

Posted on Dec 09, 2008


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Why is my heater blowing cold

Most likely it is the heater control valve that shifts air from blowing across your heater core to your air conditioner core.

If your fan works and your car is fairly new..meaning your heater core isn't dirty and full of craap...then it is the climate cotrol valve.
If you are lucky, it might be a thermostat that is bad and blocking hot water from entering your heater core. Bottom line, if hot water doesn't circulate thru that little heater core, you won't get heat.
You might be able to look under the hood and grab the hot water lines that go thru the firewall and feed your heater core. If they feel cold to the touch after engine has warmed up, then you aren't getting circulating water to the heater core. If they feel nice and warm, then the heater core is fine, but your climate control valve has closed off the fan that blows across the core to disperse heat into the cabin

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your heater core might be clogged or have an air pocket in system for this, when engine is cool, take radiator, if you have a no spill funnel to use, then set it up and car and fill your no spill funnel and let it run to burp your system if you dont have one, then take cap off, place a bucket under.your radiator, start your car, let it run till warms up, watch your antifreeze if it starts to burp.and lower, then you had air pockets, it also.helps if you raise the front end of your car to a little if your heater core is clogged feel your heater core hoses, the top one should be hotter then.the other one, if not, back flush your heater core to do this, wait till your engine cools, take off both.heater core hoses then get about 6 feet of heater hose the same size, place about 4 feet of hose on the top heater core line and place a clamp, put this hose into.a.bucket, take the other two feet of hose and place on the bottom heater core line and clamp then take your garden hose and turn water on, into the bottom heater core hose, this will push all the antifreeze and junk out the top hose that goes into.the bucket do this till you have clean water coming out now if you also air compressor, after you have clean water, do the same thing with the air hose, but only use no more then.20psi of air, you dont want to screw the heater core up after you did the air, I.always run more water though it.again to make sure everything is out after you have done this, put the heater core hoses back on, and fill system, start your car, and do as I.said above to burp the system also check your radiator cap, I will always replace them if they.are more then 5 years old, the gasket goes bad, for every psi you lose in your system, you lose heat, I forgot how the math works, but it can be 10 degrees of heat lose do.a.back flush when your eng is cool

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I have a 98 mustang and the air only blows thru the defroster, i checked blower motor, i checked vents, all that looks fine and works but ac will not blow thru vents. i checked firewall where ac lines run...

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There could be several reason. The water pump could be weak. The radiator could be low on Anti freeze. The control valve on the heater line from the motor could be malfunctioning. The thermostat could be bad. You may even have an air bubble in the system that is causing the problem. The only way to be sure is to test each are. Check the fluid level and make sure it is good then run the vehicle till it warms up. With the vehicle running and warm locate the control valve on the hose running from the motor or radiator to the firewall, there are two. One will have the valve on it. You can open this valve manually and see if that allows the interior to warm up. If it does then the controller and vacuum lines to that valve. If it doesn't then remove the thermostat and see if that resolves the issue. If that doesn't resolve the issue replace the water pump.

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First, if the engine seems to take forever to warm up, you may have a stuck (open) thermostat. Replacing the thermostat would help get your engine to warm up quickly and maintain the proper running temperature of about 180 deg F. This would solve your heater woes.

However, if the engine warms up normally but the heater just doesn't seem to put out, check the heater inlet valve. This valve is usually next to the firewall on the engine side and is activated by cable(s) or vacuum lines. It is common to find that the valve cables have frozen, the cable ends have broken off, or the vacuum lines are disconnected or broken. Another common problem on vacuum run valves is that the vacuum diaphragm that operates the valve has failed. The diaphragm won't "hold a vacuum" meaning that it leaks and won't operate the heater valve.

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A clog can cause low heater perforance in the winter. I had a 1990 Cadillac Deville that had cold air blowing in the middle of winter, and had the system flushed and that solved the problem.

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