Question about 1996 Jeep Cherokee Country

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Overheating,valve near firewall that water hose from thermostat is broke

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  • Jeep Master
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Pretty much self explanatory. the valve is called a heater control valve.
when replacing it don't pull on the hoses to the firewall or you can damage the heater core in the dashboard (a job you don't really want to do).
since there are several hoses there, make notes as to where the hoses go before removing them. Don't forget to put the small vacuum hose back on when finished. RE-fill the system with the heat on high and wait for the thermostat to open before closing it up.
If overheat was severe, replace the thermostat....they become unreliable after that happens.

Posted on May 27, 2010

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Posted on Jan 02, 2017

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1 Answer

Overheating new thermostat put in still overheating? any other reason why?


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HOW DO i REPLACE THERMOSTAT 1997 CADILLAC DEVILLE?


The most common overheating problem with the Northstar engine is a blocked purge line(small hose).The purge line is designed to purge air out of the cooling system.
There is a small diameter hose coming from near the top of the coolant tank (not the cap) ,this is the purge line.
With the engine idling,pull the purge line from the tank,if there is no coolant flow from this small hose,it is blocked and this will cause overheating.
If the hose is clear, check for blockage at the nipple on the tank.Or trace the hose back until you find the blockage.
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The thermostat in the northstar engine is located at the bottom radiator hose (unlike most conventional cooling systems), the hose connects into the housing where you will also find the water pump.

You will need to remove the air filter housing and air duct to gain easy access to the thermostat.

Remove the hose from the housing,then remove the two bolts on the flange,the thermostat can then be pulled out.

Take note of the orientation of the thermostat as you remove it.

The thermostat in the Northstar engine is a dual action device.
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1 Answer

There is no heat from the heater, is it a thermostat problem or a rad problem?


Sounds as if its a thermostat problem. If your engine temperature is staying normal it could be a valve not opening up to let the water circulate through your heater hoses. Usually located in one hose near the firewall of the car and has a vacum hose attached to it its desieghned to cut off the heat for colder A/C

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The heat in my honda accord blow warm air.not hot


sounds like you have one of two problems first check at heater core lines going into heater core see if they are hot if only one is warm then it could be the thermostat but honda's have issues with hot water valve cable jamming up this valve is located behind engine near firewall on one of the heater core hoses.

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1 Answer

Hose broke off the firewall need to know how to get it off to replace.. it has a white thing that was attached to the firewall it broke off in the hose we cant get the piece off the firewall to replace


When you say hose - is it a large water type hose? The hoses that connect near the firewall would be heater hoses. Is there a piece stuck in the end of the hose that came off? That would indicate a damaged heater core and the only repair is to replace it from inside the vehicle.

If it is a smaller hose it could be vacuum tubing that operates equipment inside the cab. A white piece on that would indicate the vacuum port that the tube was connected to and that part would likely need to be replaced.

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1 Answer

Have an '85 CJ7--put in new radiator and thermostat, new water pump--fan shroud installed, Jeep still overheats, motor runs good, doesn't act like it's a head gasket problem????? Can't figure out why it's...


Take out the thermostat and run it like this for while. If the motor still over heats: Look over by the battery, do you see where those two hoses from the radiator and the water manifold are going into the firewall? Take the hose going to the manifold from the firewall off of the connection at the firewall and connect it directly to the water pump. I think the manifold hose is the one on the right just make sure it's not the one coming from the water pump. You'll have to remove the hose coming to the fire wall from the water pump where it is connected at the pump but, that's OK for now just tie/tape it to something out of the way. Now then, your water pump will be sending water directly to the water manifold without any obstruction. When you run the motor for a little while and find that it stays super cool, I then suggest (if you want any heated air this winter) that you have the heater core (there behind the firewall where the two hoses were going) flushed clean or replaced and hooked back up. Once water can flow freely through the system your thermostat can probably be reinstalled w/ out overheating the motor.

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2 Answers

Overheating


its under the throttle body near the coil pack

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