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?
An expert who has achieved level 2 by getting 100 points
An expert that got 5 achievements.
An expert whose answer got voted for 20 times.
An expert who has written 20 answers of more than 400 characters.
Re: 1999 jeep wrangler 4.0 liter sport heater problem #2
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!
- If you need clarification, ask it in the comment box above.
- Better answers use proper spelling and grammar.
- Provide details, support with references or personal experience.
Tell us some more! Your answer needs to include more details to help people.You can't post answers that contain an email address.Please enter a valid email address.The email address entered is already associated to an account.Login to postPlease use English characters only.
Tip: The max point reward for answering a question is 15.
I do not know a link to a diagram, but I can certainly tell you how to find the thermostat! Looking at the front of the engine, there is a large water hose at the top of the motor that goes to the left, and attaches to the radiator. Not the radiator end, but the other end attaches to the thermostat cover. It has 2 bolts to take out and the little thing between that, and the motor about 2" around that kind of looks like a spinning top, is the thermostat. It is easy to change. Make sure you get ALL the old gasket off and that both bolts go through the new one, and you should be in business!