This is the Limited model with the automatic climate control. Last year, one of the wire connections on the heater resistor burned up, and the fan quit working. I took the resistor out, took it apart, and re-soldered the connection. It worked fine for about 9 months, then the heater stopped blowing hot air. It still blows OK, but the air is cold. (During the 9 months, the radiator sprung a leak, engine overheated, and the head gaskets blew out. I had a different engine and a new radiator put in. The heater was still working for awhile after that.)
2006-10-24 03:06:10 · 7 answers · asked by 1999 Jeep Grand Cherokee 1 in Cars & Transportation ➔ Maintenance & Repairs
like the other two said. heater core. but check the hoses that go to your heater core first. see if they are clogged. you might also want to flush your full coolent system to see if you blow anything out of the heater core. do that first so if thats what it is, you don't spend the money for the heater core and find that you didn't need too..
2006-10-24 03:16:17 · answer #1 · answered by bob1242431 2 · 0⤊ 0⤋
If both heater hoses are hot it is safe to assume that coolant is flowing threw heater coil. It sounds more like for some reason the controls under the dash are not working. Being a 99 model they probably work by vacuum, check for bad vacuum hoses on or around engine. You may have one that has fell off or one may have collapsed.
2006-10-24 04:55:07 · answer #2 · answered by smoke 4 · 0⤊ 0⤋
theres a valve that allows water to flow thru the heater core its usually under the hood but i drive chevrolets so im not sure about a jeep...anyway check on the two hoses that run thru the firewall one of them will hava a valve on it its usually vacum operated you might not have a line connected to it
2006-10-24 05:48:29 · answer #3 · answered by Anonymous · 0⤊ 0⤋
Could be air locked. If its a 6 cylinder the water pump could be defective. I have found 2 that the water pump impeller had disintegrated.
2006-10-24 04:34:35 · answer #4 · answered by R1volta 6 · 0⤊ 0⤋
Check your heater core.
2006-10-24 03:11:02 · answer #5 · answered by edcw0214 3 · 0⤊ 0⤋
finding out the cable which the trigger of the blow air if loose if it is full electronic check your car Manuel.
2006-10-24 03:27:37 · answer #6 · answered by abellafils 1 · 0⤊ 0⤋
change heater core!!!
2006-10-24 03:09:56 · answer #7 · answered by hunk4u9 1 · 0⤊ 0⤋