ASE tech Greg here. All obvious preliimanary checks show perfect. Have not touched or flushed yet. 55 K mile 98 flawless Jeep Wrangler 4.0 with both heater core hoses ice cold w/ engine warm. Makes no sense for solidly blocked core. No visible vacuum controlled coolant shut off valve in engine compartment. Does plenum box area inside cab have a vacuum controlled valve somewhere ? A vacuum hose routing chart should solve this mystery if you ave one handy. Thanks in advance, Greg
have the same problem?
Thursday, November 10th, 2011 AT 5:23 AM