Question about 1999 Jeep Cherokee

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I have a 1999 Jeep Cherokee Sport. The heater works but is not near as hot as last winter. Coolant level is full. Engine temp gets to about 200*. What is most likely the problem.

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Your problem is more than likely a worn heater core, also i have seen mice shredding up insulation or other debris and moving it to several sections of the ventation system which could be blocking airfow but that usually only occurs when vehicle sits for a few days, anyways the heater core is most likely worn and needa to be replaced.

Posted on Dec 29, 2010

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Try flushing out the radiator and make sure the heater core is flushed as well. If not your heater core maybe going out.

Posted on Dec 29, 2010


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Please describe your my blower works in my 1999 windstar but it wont get warm problem

If your not getting any heat out of the vents and the blower motor is working than the first thing to do is check the coolant level. If it is low the first thing to stop working is the heat.

If its full than make sure the engine is coming up to temp. The temp gauge should read around 200 degrees F. when the engine is up to full operating temp.

If the those two are o.k. that make sure you hear a difference in air flow out of the vent when you switch the heat selector from full cold to full hot. If you hear no difference than you may have a blend door or blend door actuator problem.

If all that checks out than the last thing may be a plugged heater core. Especially if the coolant is muddy looking (really common with fords). Back flushing the heater core may help or cure the problem.

Dec 16, 2010 | Ford Windstar Cars & Trucks

1 Answer

1999 Jeep Wrangler - 4cyl - 5 speed. Where do I start if my heater is not getting hot. Really doesn't get warm. Just blows out cool air. Side note: This is my 3rd winter with this Jeep and it's never...

The temp reading on the dash is a very big clue... Likely the thermostat (at the end of the large top radiator hose inside the metal housing) is stuck open. When that happens, the coolant in the engine never reaches full temp. Not only can that result in a low heat condition but it can also give you poor fuel mileage as the computer always thinks the engine is cold and therefore it adds extra fuel to keep it running.
Replace with a 195 degree(f) thermostat, run the engine (with the heater on full heat) to nearly normal temp, turn it off and wait about three minutes, then re-start and continue filling. Once full, add whatever is necessary to the recovery bottle and close it up and check for leaks.

Dec 09, 2010 | 1999 Jeep Wrangler

1 Answer

Why is my 1999 jeep grand cherokee is leaking all of my coolant i replace thermostat and seal can it be my water pumpbefore it was doing that my heater wasnt blowing hot wat cant it b

Likely the heater isn't blowing hot because the coolant level is low. You need to look at everything...hoses, under the pump pulley, radiator, both sides of the engine from underneath and check the tailpipe for steam. No one can tell you what's leaking without looking at it. There are too many items that can leak. Look carefully and you will find the problem. When checking, look first with the engine cold and the cap removed. If you find nothing, put the cap back on and run it to build pressure and look again. (careful working near fan and can get hurt there)

Nov 29, 2010 | Jeep Cherokee Cars & Trucks

2 Answers

1999 jeep cherokee sport heater problem. Air just blows warm and not hot. Gets warmer when stepping on the gas, but still goes back to warm and then cold.

Check the coolant level in the over flow tank/ bottle under the hood. You may find that the coolant tank is empty or very low, causing the engine to also not have enough coolant to circulate in the heater core that provides heat to the passenger area. Just a simple solution for now.

Feb 20, 2010 | 1999 Jeep Cherokee

1 Answer

I have an 01 Jeep Cherokee Sport. I am having

As soon as the vehicle reaches around 180/195 (depends on the temp of the t-stat) the thermostat should open and thereby filling the top hose with warm/hot water.
Are you sure the thermostat is facing the right direction? Is the cooling system full?
Here is what you can do: remove the t-stat, replace any lost coolant/water and run the vehicle with heater on full blast for about 15 minutes or until the temp gauge is showing about halfway. During this time be sure to monitor the coolant level in the reservoir.
If you still have no hot air you may have a blockage or perhaps the heater hoses are not even connected.

Jan 06, 2010 | 2001 Jeep Cherokee

1 Answer

Heater wont work in my 1999 jeep cherokee sport. The fan blows but wont get warm. Does not leak in the floorboard as some do. Was wondering if there is a fuse for the heater?

One or more of:

1. Your coolant level is low
2. Your thermostat doesn't close and needs to be replaced
3. The valve from the cooling system to the heater core is stuck
4. Your heater core is clogged

Jan 03, 2010 | 1999 Jeep Cherokee 4WD

2 Answers

Heater problem

Ok, some clues, good. When the jeep has been driven for 10minutes, it should be at operating temperature. What does the temp. gauge indicate at that time? Is it on the low (cold) side, in the middle (normal) or near the hot end of the temp. gauge? Let me know the answer to the above, also check to coolant level and let me know what you find. If the coolant level is low, it can result in the engine running hot, and result in no heat. When the level is low, it won't circulate coolant through the heater core, which means you won't have heat. So let me know about the engine temp, and the coolant level, this is the easiest and simplest possibility of why you don't have heat. If this isn't the problem, do not rate my answer until I can help further after I get the above info from you.

Nov 23, 2009 | 1999 Jeep Grand Cherokee

1 Answer

Where is the thermostat located. I have no heat. Also the heat on the passenger side did not blow hot air last winter, only on the driver side, now none. Help!

If your temperature gauge and actual engine temp are normal and coolant level is full, you don't need a thermostat.(normal run temp is from 200 to 210 degrees. Likely your problem is a blend door not moving properly. Unfortunately, most controls on your heater box are inaccessible and the entire box needs to be removed (big job, get a manual or have a shop do the work)

Oct 10, 2009 | 2000 Jeep Grand Cherokee

1 Answer

1999 jeep wrangler 4.0 liter sport heater problem #2

Make 100% sure before you go and spend more $$$ that (1) you have good coolant flow through the heater core; get engine to operating temp,then with heater fan on high and temp control on full hot carefully grasp heater in and out hoses(i use a in-fared heat gun to diagnose). They should be very close to same temp, if not, core is plugged or if equipped with a flow control valve, its not opening or there is an air lock in system.(2) If coolant flow is good, suspect the hot/cold blend door being stuck in cold position assuming you have good air flow. Its very rare for engine cooling to be ok and heater core coolant flow be bad , caused by a failed water pump! Hope this helps! Please rate me,Thanks!

Jan 18, 2009 | 1999 Jeep Wrangler

1 Answer

Heater blows warm-cold after running for 25min.

First, make sure that your coolant level is full (in the radiator) Next, check and see exactly what temp the engine is running at (most run at about 210) Check the heater control valve and make sure the small control arm moves when changing from a/c to heat. Check that both hoses are hot (one will be at engine temp, the other a bit cooler but not cold) If you haven't found a problem, answer with better specifics on problem including some history, anything else you noticed and which engine etc.
Good luck

Jan 13, 2009 | 1996 Jeep Cherokee Sport

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