Question about 1997 Jeep Grand Cherokee
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Posted on Jan 02, 2017
SOURCE: Heater blows cold air when idle
Sounds like you may have a partially plugged heater core. You could flush this out separately, from flushing radiator & engine block. Diconnect heater hoses going to your heater core and clamp off, so not to loose coolant from engine. Now hook up separate hose to one side of heater core pipe and flush out with typical garden hose. Repeat procedure on both heater core inlets. Reconnect original heater hoses and test difference. You may have to add an additional litre of antifreeze. If this don't work i suggest changing heater core. Good luck.........Ron.
Posted on Jan 03, 2009
check that the heater control valve on the heater hoses is working, also check that blend door inside heater box and blend door vacuum motor are working. Likely the problem is with the door or motor, but unfortunately, the entire heater box needs to be removed to get to them on most vehicles.
Posted on Jul 11, 2009
The first thing to check for this condition is the heater control valve. This is usually located up close to the firewall behind the engine. There will be coolant hoses attached to it. This valve opens and closes to let hot coolant enter the heater core and to cut off this coolant when heat is not needed.
There should be an arm on the top of the valve that is attached to a cable from inside the car. When heat is called for, the cable should move the arm, thereby opening the valve. Make sure this arm moves freely.
Posted on Oct 21, 2009
Check the coolant level, sounds like you may be slightly low....Be sure heater is on high when filling the system....Look for any air bleeds...
Posted on Dec 06, 2009
This is a common problem with WJ Grand Cherokees, it's called a "Blend Door".
In the heating and cooling system you have doors that open and close to give you warm and cold air and a mix of both.
What you have is an arm that pulls a door with peg on top, the peg tends to snap off. As you said your dealer replaced the blend door or doors I would take it back as is has blend door all over it.
Yahoo and youtube "jeep grand cherokee blend door repair"
I had a 02 limited blend doors issues (note the issueS) and was lucky to have it still covered.
I do hope this helped.
Posted on Nov 24, 2010
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