Question about Jeep Grand Cherokee
Heater blows out hot air then cold air and I just found out water is not circulating in radiator...what does this mean>?
Lots of thing, this happen by random? or it leaked out or doing service.
1: thermostat bad or installed backward or jiggle pin not UP hill.
2: air in the block, never burped during service.
3: pump impeller fell of, or rotted off.
4: fan belt missing or loose.
thats about it.
Posted on Dec 29, 2013
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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 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
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