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99 jeep cherokee not getting any heat. New waterpump and thermostat. System flushed and has flow. Heater hoses and upper radiator hose hot, lower hose warm. Any way to bleed air out of the system?

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With engine cold, remove radiator cap, start engine, if there is air in the coolant system it will "burp" it out through the open radiator cap. Check fluid level and replace cap.
Good luck

Posted on Jul 22, 2010

  • mopar2011 Jan 24, 2011

    I have the same jeep. Just fixed it. Most often overlooked thing with this vehicle: Air in the heater core. The Jeep needs to have its front end jacked up to bleed remaining are from core if you have done anything to the cooling system. Will not work w std procedure on level ground. Google self diagnostic mode and the trouble codes on you ac/heat display can tell you if you have heater blend door problems. If so look into the "heater treater" fix. Also if doors are good, your heat works again and you can't locate any leaks a new radiator cap is advisable. The springs and seals are notorious for allowing air in, coolant out and improper system pressure.

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2001 Jeep Grand Cherokee heater does not work. Saw the Youtube videos, cut hole in box, verified blend doors both operate when heat turned up. Flushed radiator with a commercial radiator treatment...


probly need a new heater core--get a haynes manual or library sec629 has pro mechanics series--if u get new one test evaporator and blower motor also to save labor

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is there a chance that one of your heater hoses are clogged? or where they connect to the engine are clogged still? sounds like a clogged system. Cracked heater housing? Outside air bypassing the heater coil while driving?

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If you flushed the coolant with the thermostat in, chances are you didn't flush the coolant. Regardless, it's easiest to check the controls inside first. Does the blower fan work? Does the air flow change from floor to vent, to dash as it's supposed to? Does the A/C change temps when knob is turned from cold to hot? Post results.

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1999 jeep cherokee . overheating and no heat!!!!


Replace the thermostat and bleed the air from the cooling system, then if it still overheats you may have a leaking cylinder head gasket. Any shop can detect the leakage with a gas analyzer by looking for the presence of combustion gases in the cooling system.

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1995 jeep cherokee heater problems


Get jeep up to operating temp
Turn on heater to max heat
Hood feel 2 heater core hoses goint into upper passenger side of engine compartment firewall.
They should feel too hot to hold
If it's not hot, could be 6 things
1. heater control valve is bad
2. Vacuum to heater control valve is bad
3. clogged heater core.
4. Bad thermostat
5. Bad waterpump
6. Needs more coolant (check when system is cold)

Do these things:

1. Disconnect vacuum line from control valve and feel under valve to manually move valve to open position. This should let hot water flow through core. If you now have heat inside, replace the heater control valve. Or you can disconnect the plunger on the heater control that is hooked on to the silver bar on the bottom of it. With it disconnected you can manually move it to the open position. It will always remain on.

2. When system is cold, disconnect both heater hoses going to heater core. hook up a water hose to one side of heater core and flush out any gunk. When you get done, the water should run clear. If you see lots of gunk come out, that was probably the problem. Replacement is like $20-30

3. When system is hot and engine running, squeeze the upper radiator hose (using gloves) when you release it you should feel a surge of water. Proves your water pump is working. If no surge, check thermostat. If thermostat checks good, look at the weep holes at the bottom of the water pump for traces of antifreeze. If you see a trace or stream of coolant, indicates bad pump.

4. As far as testing the thermostat, watch as your engine heats up on the gauge. when it gets to a certain point you will see the temperature rise, then lower, then rise again. This means your thermostat opened properly, cooling the system temporarily, then heated it back up. Replacement is around $5

Try these and see how it goes.

Feb 01, 2012 | 1995 Jeep Cherokee

1 Answer

95 jeep cherokee heat


Both of the hoses at the heater core should be hot. If one is cold the heater core is plugged. You can think of it this way. If the thermostat was stuck closed and you checked the upper and lower radiator hoses with the engine hot the upper hose would be hot and the lower hose would be cool because there is no flow. If you check the hoses with a properly working t-stat both hoses will be hot when the t-stat is open and coolant is flowing. Let me know if you have any questions and I'll do my best to answer them. Thank you for using FixYa.com!

Jan 21, 2012 | Jeep Cherokee Cars & Trucks

1 Answer

Heater won't go to full hot have air but little heat


Check your thermostat. Put a meat thermometer in radiator start engine wait till top radiator hose gets hot it should be 180 or better if not replace. If it does get hot flush the heater core by disconnecting the two hoses and hook a garden hose to it and back flush it. If no heat now your doors are not working under the dash

Dec 01, 2011 | 1995 Jeep Grand Cherokee

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I dont have any heat and i need to know how to replace the hearter core, however the windows aren't fogging up so maybe its the thermostat


the only way you should have to replace a heater core is if it leaks or gets plugged up. When motor is hot feel the two hoses that go to the heater core. one should be fairly hot and the other should be the same but if one is just warm then follow hose and locate a flow valve and check for operation. OPening and closing with control hot /cold knob. Check coolant level in radiator while cold as well as fill reservoir to full when cold. Also remove radiator cap when cold and warm truck and check for flow of coolant. if lower radiator hose is hot hot hot and upper hose is cool then thermostat may not be opening properly, or thermostat is stuck open not building heat. You didnt mention if truck was overheating?? If its not i'd check for the flow valve operation, if it is i'd make sure coolant levels are full and waterpump is working.

Feb 03, 2011 | 1994 Chevrolet Astro

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1994 Honda Civic LX\overheating within 2 mile drive


Remove and raise upper hose at thermostat end and remove lower rad hose.
Fill rad with a hose and watch for flow from bottom rad hose and/ or bottom rad hose connecton.......water should fall though rad easily.
Honda rads are cheap.....any restriction....replace rad.

Remove thermostat....fill thermostat housing with hose and watch for water flow at bottom rad hose.
Flush good.

Remove heater hoses.......flush back and forth until a good flow is present "With heater control set to hot" if no or poor flow....replace heater core.

Stop leak can plug everything.

Also.......not likely causing over heating....but ....at your mileage,if you do not know if the timing belt has been changed.....CHANGE IT NOW!
Water pump is optional at this mileage.

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