1996 Jeep Country. have had some cooling system issues. Just replace Water Pump, Thermostat & Serpentine Belt. Prior to this, had issues with some leaks & heat stoped blowing HOT. Heater control Valve is less than a year old & removal/inspection confirms normal operation and condition. When heat is turned on, it wil get WARM, but never gets HOT. Suspect Heater core ... I am getting coolant flow thru Core. Any advice? Am not looking fwd to Heater Core Replacement.
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Re: 96 Jeep Country-Heater blowing warm; NOT hot
Unless you got visable signs of leakage its not heater core, but it could be pluged with sediment. take off both heater hoses and flush it both ways until it runs clear. you can also mix a little baking soda and water and pour in core and let set for a while and then flush.
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Check your radiator for cold spots when its warmed up. I think you may have some blockage either in your radiator or the hose going to your heater core. Also check the serpentine belt tension and the pulley on your water pump.
Sounds like low flow issue. Flush and clean system, PROPERLY! Buy a flush kit, drain system, blow compressed air through, fill with cleaner/water mix, run for 30 min with heat on, drain system, blow out with compressed air, fill with water, run for 30 min, drain, blow out with compressed air, fill with 60% coolant mix.
The water pump would be the next thing that I would check out see if there is any coolant by the water pump. It sounds like you aren't getting any circulation and it probably wouldn't hurt to flush out your coolant system there might be a blockage in one of the water jackets or the heater core. And also see if your cooling fans are working on the radiator. You might have a relay that failed. One way to try to fool the computer when it starts to get hot turn on your air conditioner it should activate the cooling fans. Also check the fans motors themselves make sure that they are good and that they are working properly.
the one thing that comes too mind is trapped air-when i do a radiator I always start up and warm engine so thermostat cycles a few times to make sure that you dont trap air in colling system. you did not say so but if you didnt, its really not a bad idea to change thermostat and gasket when digging into colling system. they are usaully fairly cheap.
now there are several thing you need to check( since you know the blower and vents are working) start the jeep. let it warm up, sorry to do this to you, but turn on the heater. under the hood are two hoses going to the heater core, by the blower. after the jeep has warmed up, and heater running for about 2 minutes, check to see if either hose got warm or hot. If yes, bad heater core. if no, then the control valve that allows hot coolant to the heater core is bad. you can trace it if you follow the line to the engine, it is connected to a valve, and valve needs to be replaced( you can get it at the auto parts store). hope this helps you
Thermostat.? if you haven't? Do it first then try it. While the car is running for a while touch the heater hoses that lead to the firewall. if one is cold and one is hot? You have a blocked Heater core. Follow the hoses back to the engine. Unconnect them both. By using a garden hose flush out the heater core do one side and then reverse by doing the other hose Lots of junk will come out so be care ful. Mistake people make is "Flushing the system" That doesn't mean your flushing the heater core. Seeing that you have done everything else it could be the thermostat which you didn't list or the heater core being clogged. When you finished installing the thermostat and flushing the heater core out. Replenish the coolant system . If you have a bleeder on the thermostat housing? use it . loosen it and top off the fluid until you see fluid comeout of the bleeder. The system being air bound would cause no heat..
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.
you should have hot water on all rad. hoses when the motor is running at a norm. temp. the water is not going through the heater core like it should. you have cutoff valve bad low water are a stopped heater.try a hoter thermostat if none of the above are true.