1996 Jeep cherokee, leaking coolant when cold/ hot ok.
The lower radiator hose by the water pump side is leaking coolant
The back corner of the engine driver side leaking coolant.
When cold. As engine get to operating temp for 15=20 minutes leaks stop when running, The leaks are when engine is shut off and system is loosing pressure, The engine is 4.0 liter straight 6 cylinder.
Engine is not missing/ runs good,
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The engine coolant does not "circulate" through the reservoir in your Jeep. This system works on the fact that things expand when they are hot and contract when they are cold. When the radiator is full, the coolant expands when the engine gets hot and the overflow runs down the small hose to the reservoir. When you shut the engine off, the coolant contracts and a vacuum is created inside the radiator causing fluid to be drawn out of the reservoir and into the radiator. When you start your engine and it gets hot, the cycle begins again.
If the radiator is empty, this sytem cannot work. There will not be enough vacuum generated in the radiator to draw the fluid from the reservoir (too much empty space and not enough coolant contracting as it cools).
You need to find out WHY the radiator is low. If it is low, there is a reason for it. Either something is leaking EXTERNALLY like a hose or water pump, or something is leaking INTERNALLY like a blown head gasket or a cracked cylinder head. Proper diagnosis is recommended.
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)
Did you have the thermostat replaced when they did the water pump, as this might be stuck closed and preventing circulation of the water and overheating.....
To check, top the system back up with just water, and run until hot. Switch engine off and feel both radiator hoses, they should be the same temperature, if one is hot and the other cold/lukewarm, the thermostat is stuck closed or partially open.
Front drivers side could be a bad cap, lower hose or the radiator itself. You need to look carefully and find the leak source. Steam travels and isn't a good indication of where the actual leak is coolant will run down and take any path it can to reach the ground. Therefore, you need to follow it back to where it is coming from, then deal with it. Your water pump can also leak and run down the lower hose. there is a small hole in the pump behind the pulley. If you see coolant coming from there the pump needs to be replaced. Sealers will not work on hoses or pump leaks so don't bother using them for that. Good luck...don't forget this is free, so rate answers! I will answer follow-up questions too!
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.
Sounds like one of two things are happening. Either the hose going to the heater core (on the engine side of the dash) is leaking causing coolant to spray into the passenger compartment or your heater core is leaking which is causing the dripping from the passenger side of the dash. This would also cause a loss of coolant in the engine which would cause the engine to overheat and not enough coolant to get to the heater core to supply heat to the passenger compartment. Check your coolant level (while engine is cold) and refill it with a 50/50 mix of coolant and water after you tighten the leaking hose or replace the heater core.Then start the engine and let it warm up to operating temperature. Again let it cool down and then top off the radiator with the 50/50 mix of coolant. Do not under any circumstances open the radiator cap while the engine is hot.
Hmm I don't recall 4.0 having oil coolers be way to be sure is to buy a coolant pressure tester fill the sytem (with water don't waste new coolant) and pressurize it. The most common coolant leaks on 4.0 engine that I see r from the rad and the water pump.