Question about 1999 Jeep Grand Cherokee
This is easy. (are you moving or parked) ill assume stopped.
first is the blower working, (seems so)
ill guess that no heat in all vent modes, and re-circ, on.
next is the engine fully hot, hot means at 180F or more holding
(we measure it with a pyro gun)
next, are both heater core hoses hot/ at the fire wall? and equal at 180f?
yes, good. then the damper is stuck closed i the heater box.
no , then there is heater core blockage. (skipping every 2 year flushes are you, sure...)
it only takes 2 things
hot water ,p[assing through the heater core
and air passing through its fins to get hot cab air.
Posted on Nov 14, 2014
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Posted on Jan 02, 2017
try flushing out the heater radiator core.remove the two pipes and put a hose on the conections and keep reverseing flow.dont forget to top up with pure antifreeze,
Posted on Feb 05, 2009
Typically a heater won't cause a no heat condition unless it's clogged. On these Jeeps, it will usually leak either inside or outside of the truck. The whole dashboard has to come out including the steering column in order to access the air box, which also has to come out in order to change it. If you are having a no heat issue, you may want to check a few things first. Make sure thermostat is working properly and installed correctly. Verify coolant level is good and no air pockets in cooling system. Make sure the blend door motors are working and switching from cold to hot. A good way to see if you have good flow through the heater core is to feel the heater hoses at the firewall where they connect, make sure they are both hot after engine is fully warmed up. If 1 is hot and the other is cold, you know the core is clogged. If that's the case, you can try disconnecting the hoses and back flushing the heater core to get any dibris out. Otherwise, you will need a book or manual for the procedure, it's very involved and time consuming.
Posted on Dec 18, 2012
I would make sure the core is the problem. You may have a heater control valve that cuts off flow to the core by vac. or a blend door that cuts off air flow thru the core.
You will need a shop manual to replace the core. The dash and console have to come out, along with discharging the ac.
Posted on Dec 18, 2012
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