Question about 2001 Jeep Grand Cherokee

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I replaced the thermostat on my 03 plate jeep as the heater wasnt getting hot, filled it back up with water and started my jeep, put it into drive it moved forward then just stalled and now wont start!! What have i done wrong???/

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  • Jeep Master
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Probably unrelated problem. You will have to troubleshoot.

Please see my tip at http://www.fixya.com/cars/r5821173-doesnt_car_start_gasoline_engines . These are generic instructions. If you get stuck or need specific instructions for your car, please get back to me with model, year and engine info.

Posted on Oct 11, 2010

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Posted on Jan 02, 2017

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1 Answer

Heater blows cold air


soun ds like heater core is plugged. did you try back flushing the system?

Sep 27, 2012 | 2005 Jeep Grand Cherokee

1 Answer

I put new thermostat on and it started running very hot again. I drilled to holes in the thermostat to increase the water flow and it still ran hot. It's weird cause the bottom radiator hose was running...


Flushing a radiator at home is most often a waste of time. The chemicals used by a radiator shop are far stronger than anything you get at the parts supply house. What happens is that the flow you see is deceptive as the water tends to flow around a partial restriction and does nothing to remove it.
Though your garden hose has a lot of pressure it doesn't have the volume necessary. A garden hose will usually be sufficient to flush out a heater core though as it's smaller.
Have a radiator shop flush your radiator core and have a hydrocarbon test done on the cooling system to eliminate the possibility of head gasket problems. When re-filling the system, turn the engine off just before it reaches 210 degrees and let it sit for a few minutes so the thermostat can open, then continue filling. Always fill with the heat on high. Thermostat goes in with the spring end into the engine.Forget about the water pump...unless you got one made for a twin engine marine (CCW) application it has nothing to do with the problem though I've heard but never actually seen that the belt can be installed so it turns backwards.
When the engine is at operating temp cover the grille and force it to nearly go into overheat...the electric fan should come on and the mechanical fan should lock up to try to counteract that.
Don't open the system when it's hot (you found that out already). And, don't allow the engine to actually overheat.
My bet without seeing it? Likely a partially obstructed radiator. 4.0 engines make a lot of rust residue even when maintained. If that's what you have in there, or even the 4cyl. It is more than likely.

Jan 19, 2011 | 1989 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 belt...you can get hurt there)

Nov 29, 2010 | Jeep Cherokee Cars & Trucks

1 Answer

My 1999 Audi a6 started overheating so I took the radiator cap of but the engine was still hot so antifreeze went everywhere so I filled it with water. I got in the car and the heat in the car wasnt...


I would suspect the thermostat has stuck closed. Drain the system, heater on hot, flush the system, replace the thermostat, pour in pure water and see if that cures the problem. If it does then drain the system again and pour in a 50/50 mx of antifreeze and distilled water. You also need to make sure the cooling fan is working and the water pump is circulating coolant in the system.

Oct 28, 2010 | 1999 Audi A6

1 Answer

1996 jeep grand cherokee blower works but no heat. I flushed heater core with hot water, replaced thermostat, and water pump is circulating. Vacuum line?


Since your blower is working and it is a heat issue,thats where we'll start,First thing is have you checked the coolant level in the radiator when engine is cold,make sure it is filled to top,next verify you have coolant in reserve ,Start your van and get it up to normal operation temperature,If your heat gauge on the dash works correctly it should be 190 degrees,Now lift the hood and locate the two heater hoses going into the heater assembly at the fire wall,Both hoses should be hot to hold on to,if both are hot and no heat inside your problem will be the blend air door in heater assembly.
if neither hose is that hot you need to replace the thermostat in the engine to get it up to 195 degrees.
if one hose is hot and one is luke warm then the heater core is blocked and to blame. hope this helps you.

Jan 12, 2010 | 1996 Jeep Grand Cherokee

2 Answers

Replaced Heater Core. Replaced Thermostat, Removed Valve from heater Hose. still no heat.


When re-filling the radiator you need to keep the heater on high heat. If that has no effect, feel both heater hoses to make sure they are hot. Last, I hope you checked the blend doors for proper operation before you put it back together, often they will fail and not open or close properly. a bad vacuum motor that controls those doors can also be faulty.

Oct 28, 2009 | 1986 Jeep Cherokee

1 Answer

I have a 1993 jeep cherokee and it stared 2 over heat and i changed the water pump and took out the thermostat and still over heats and rattle


First, put your thermostat back in Use a new 195 degree.Your computer will not function correctly if you dont. Next, check that the electric fan is coming on at about 210 or just a bit higher. You didn't mention which engine, but I'll assume its a 4.0. When filling the radiator, if it fills very slowly and backs up while filling, likely the radiator is plugged up. Sometimes they can be flushed but most times you need to replace them as flush tends to bypass plugged areas and not remove obstructions.
Always re-fill with heater on full hot.

Aug 02, 2009 | 1993 Jeep Cherokee Country

1 Answer

Over heating quickly


First, start engine and attempt to re-fill with the heater on hot. Sometimes they can get airbound. There is little chance this is being caused by the water pump. Far better chance that the radiator is internally plugged. Jeep radiators are notoriously small for the application and have little room for "error" Partial flow will cause this problem... I've seen it as the major reason aside from a head gasket failure for overheating (assuming you put the stat in correctly) I use a swimming pool pumpfilled with household "lime away" rust & lime remover (which is usually what obstructs core tubes). to backflush these, but you may wish to have a shop do it in a more "normal" way.To do this correctly, the radiator must be removed or rust will remain in tank.

Feb 16, 2009 | 2000 Jeep Grand Cherokee

3 Answers

Engine block does not heat up


Check the radiator fan relay. If it fails and leaves your fan running all the time, then you may never get hot.

Mine failed in my '03 Jeep Cherokee, but it failed open. Didn't make for a fun drive home. Was located behind the right headlight, and in order to access, had to drill a hole in the splash shield behind the headlight. Then plugged back up with a hole plug from the hardware store.

Oh, and the heater never really get's hot. I don't know what temp it get's to, but hot, like in my '01 Tahoe, it's not.

Feb 03, 2009 | 1996 Jeep Grand Cherokee

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