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Old January 22nd, 2013, 09:08 PM   #1
jdeff87
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Default 96 Jeep wont blow hot air

I have a 1996 jeep grand Cherokee Inline 6, 4.0. it blows Luke warm air not hot like it use to. I'v had the water pump changed. The lines to the heater core don't get hot and are soft. Along with the hose that comes from the radiator and goes into the block is not hot and also soft. radiator cap is also not hot. any ideas?
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Old January 22nd, 2013, 09:17 PM   #2
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What's temp reading? Sounds like your thermostat is bad/stuck open. Much better than closed!
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Old January 22nd, 2013, 10:05 PM   #3
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Or your heater core is clogged.

Thermostat and coolant flush should get you what you want.
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Old January 23rd, 2013, 07:20 PM   #4
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I am going to ask the obvious question...is is topped off with coolant. The radiator was leaking in my wife's XJ, the coolant level got low enough that it had exactly the same symptoms you are describing.
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Old January 23rd, 2013, 07:37 PM   #5
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I am going to ask the obvious question...is is topped off with coolant. The radiator was leaking in my wife's XJ, the coolant level got low enough that it had exactly the same symptoms you are describing.
Good point!
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Old January 23rd, 2013, 08:35 PM   #6
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also a bad radiator cap will cause all you describe but the t-stat is the most likely culprit
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Old January 23rd, 2013, 09:17 PM   #7
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Its running about 190 to 200 degrees like it always has. had a flush done not to long ago when i had the water pump replaced. all new coolant and its topped off with coolant. if the thermostat was stuck open wouldn't it take a while for it to get up to running temp? could the blender door have anything to do with the heat?
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Old January 25th, 2013, 09:09 AM   #8
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Its running about 190 to 200 degrees like it always has. had a flush done not to long ago when i had the water pump replaced. all new coolant and its topped off with coolant. if the thermostat was stuck open wouldn't it take a while for it to get up to running temp? could the blender door have anything to do with the heat?
While the blend door could affect the temperature INSIDE the vehicle, it will not affect the temperature of the heater hoses or upper radiator hose.

You should not be able to hold onto the hoses once the vehicle warms up (too hot).

Sounds like a thermostat issue. It could be something from changing the water pump stuck in the thermostat (gasket?).

A plugged heater core won't cause the upper hose to be soft and warm. A soft hose is usually a pressure issue (not building any).

Dumb question, but is it possible they put the wrong water pump on? (spinning the wrong way?)
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Old January 25th, 2013, 09:12 AM   #9
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Blowing hot air is a womans job anyway
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Old January 25th, 2013, 10:47 AM   #10
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Was it warm before the new water pump? Have seen a few reverse flow water pumps that caused this problem.
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Old January 25th, 2013, 02:46 PM   #11
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Definitely sounds like a thermostat, simple easy job.
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Old January 25th, 2013, 02:58 PM   #12
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Quote:
Originally Posted by jdeff87 View Post
I have a 1996 jeep grand Cherokee Inline 6, 4.0. it blows Luke warm air not hot like it use to. I'v had the water pump changed. The lines to the heater core don't get hot and are soft. Along with the hose that comes from the radiator and goes into the block is not hot and also soft. radiator cap is also not hot. any ideas?

This is starting to be a common question on all 4.0's that I have seen in the last month or so. (about 7 total) Every one of them had an air bubble, from recent cooling system repair.
On a 4.0, top it off at the radiator cap, and then pull your heater hose. Continue to fill through the heater hose until you see coolant coming up through the barb on/near the thermostat housing. This means your heater core is now full. I just recently added a gallon of coolant to an XJ that ran fine for temp, but would not give off any heat. (2 actually)
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Old January 25th, 2013, 03:11 PM   #13
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looks like I also found why my heat sucks!
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Old January 25th, 2013, 06:20 PM   #14
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Quote:
Originally Posted by FORD FLARESIDE View Post
This is starting to be a common question on all 4.0's that I have seen in the last month or so. (about 7 total) Every one of them had an air bubble, from recent cooling system repair.
On a 4.0, top it off at the radiator cap, and then pull your heater hose. Continue to fill through the heater hose until you see coolant coming up through the barb on/near the thermostat housing. This means your heater core is now full. I just recently added a gallon of coolant to an XJ that ran fine for temp, but would not give off any heat. (2 actually)
Or use a vacuum filler.
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Old January 25th, 2013, 07:14 PM   #15
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problem solved thanks everyone
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Old January 25th, 2013, 08:10 PM   #16
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problem solved thanks everyone
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Old January 25th, 2013, 09:22 PM   #17
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I took both of the hoses that went to the heater core, used a air compress or blew all the coolant out. bought some oven cleaner sprayed it into a bottle mixed some water into it poured it in one hose until it came out the other end. let it sit for about 10 mins. blew all of that out and repeated with just water 4 or 5 times to clean it out.( Lots of gunk came out) filled back up with antifreeze and blowing hot air like it use to.
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Old February 5th, 2013, 10:56 AM   #18
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Quote:
Originally Posted by jdeff87 View Post
I took both of the hoses that went to the heater core, used a air compress or blew all the coolant out. bought some oven cleaner sprayed it into a bottle mixed some water into it poured it in one hose until it came out the other end. let it sit for about 10 mins. blew all of that out and repeated with just water 4 or 5 times to clean it out.( Lots of gunk came out) filled back up with antifreeze and blowing hot air like it use to.
This happended to my 97 ZJ when I first got it. I took the two heater hoses off and flushed both pipes out going into the heater core with water, you should have seen the gunk fly out.

Now the heat will melt your eye brows off...lol
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