Question about 1993 Jeep Grand Cherokee
I have replaced all the hoses, thermostat, and radiator cap. I flushed the system, and I know the heater core isn't plugged. The Jeep isn't overheating, just won't blow hot air inside the cabin. Thanks...
It appears we have an Air lock scenario and you will need to perform a system Bleed.
Park the vehicle on level ground, when cold remove coolant filler cap, start engine and leave to idle, turn heater on full and blower to max. When engine reaches operating temperature watch and listen near coolant filler, keep clear as gurgling and hopefully a boil over should occur. Top up with very warm coolant and wait as it may do it again.
Check for heat inside vehicle if warm replace coolant cap but keep an eye on temperature gauge as the ~Air lock may have moved on from heater matrix/core so proceedure needs to be carried out again from COLD.
If persistent boil ups/over attention must made in the cylinder head
or gasket area, or possibly water pump?
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Posted on Feb 05, 2009
On this style you cable may be frozen at the heater box or even broken off. On the right side of dash at the bottom of box try moving the selector back and forth from hot to cold and watch the box to see what is happening. Hope this helps steve
Posted on Feb 13, 2013
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Posted on Jan 02, 2017
The only reason it won't blow hot air is because the water is not getting to the heater core. Check to see if you have a heater control valve in one of the two lines to the heater core. If so check to be sure that is is opening and closing. If it won't open then you get no water flow in to the heater core.
Posted on Feb 07, 2009
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