Need to replace heater core. 1999 limited edition jeep cherokee doesnt blow out any warm air at all. will blow out cold air constantly. its automatic 6cyclinder 4.0 liter
SOURCE: need to replace heating core
CAUTION
After disconnecting the negative battery cable, wait 2 minutes
for the driver-s/passenger-s air bag system capacitor to discharge
before attempting to do any work around the steering column or
instrument.
Instrument panel wiring harness connector from the 100-way wiring harness connector at the left side of the inner panel.
Side window demister hose at the heater/air conditioning housing demister/defroster duct on the driver-s side.
Two halves of the heater/air conditioning system vacuum harness connector.
Instrument panel wiring harness connector from the heater/air conditioning system wiring harness connector.
Instrument panel wiring harness connector from the passenger-s side air bag module wiring harness connector.
Side window demister hose at the heater/air conditioning housing demister/defroster duct (passenger-s side).
Two halves of the radio antenna coaxial cable connector.
Two instrument panel wiring harness connectors from the passenger air bag ON/OFF switch wiring harness connector.
Passenger-s side air bag ON/OFF switch wiring harness from the
retainer clip on the plenum bracket that supports the heater/air
conditioning housing just inboard of the fuse block module.
Two lower passenger-s side air bag module bracket-to-dash panel nuts.
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.
SOURCE: heater only blows warm air.
The hoses from your heater core should be very hot to the touch. Check the hoses going to the core from the water pump. It should be very hot. The return hose should also be very hot. Now check the hoses going to the core. If they are not the same temp, then your heater control valve is not working correctly or the vacuum is not working. At any rate, locate the vacuum line going to the heater valve. Remove the silver bar on the valve from the plastic plunger arm. You will have heat all the time now if it was only a vacuum problem. You can fix it later when it's warmer out. BTW a 200* thermostat will make your heater even hotter.
SOURCE: 1999 Jeep Cherokee sport/air vents do not blow out cold or hot while it is on
this sounds like the recirculation door in the heater box is broken and this is a difficult and can be an expensive repair as the dash has to be removed for access. a quick check for this is if you release the glove box and let it hang you will see the heater box if you reach up to the left top you will feel a grid and the recirc flap is housed there you can operate the blower and hot and cold and see if flap moves
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