Question about 1999 Jeep Wrangler

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1999 jeep wrangler 4.0 liter sport heater problem #2

I wrote yesterday I had a new radiator and thermostat put in and am getting no heat althought it is blowing air-I appeciate the response on getting lines blown but guy said he did that and he also recommended a new water pump because fan blades may be rusted and not pushing hot water up to blower Could this be a problem?

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  • mugsygsu Jan 18, 2009

    I will try this Thanks for responding Now where are heater in and out hoses This might be a dumb question but that is why i am on Fix Ya

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Make 100% sure before you go and spend more $$$ that (1) you have good coolant flow through the heater core; get engine to operating temp,then with heater fan on high and temp control on full hot carefully grasp heater in and out hoses(i use a in-fared heat gun to diagnose). They should be very close to same temp, if not, core is plugged or if equipped with a flow control valve, its not opening or there is an air lock in system.(2) If coolant flow is good, suspect the hot/cold blend door being stuck in cold position assuming you have good air flow. Its very rare for engine cooling to be ok and heater core coolant flow be bad , caused by a failed water pump! Hope this helps! Please rate me,Thanks!

Posted on Jan 18, 2009

  • gasitjr Jan 18, 2009

    They are on the passenger side and go thru the fire wall,warm engine for a few minutes with control in floor heat and fan on low. the two hoses that are heating are the ones you want. The one that heats the most and first is the inlet.Now that I try to picture this vehicle they may come in from drivers side. Good Luck saving$$

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