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1998 Jeep Cherokee NO HEAT

I have a 1998 Jeep Cherokee and I have no heat. We replaced the radiator and the thermostat and still no heat. It used to have very good heat within the last couple weeks it started having no heat. Please any suggestions would really help!

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  • Dodgechick Feb 12, 2008

    We had the radiator flushed and then it started leaking the heat started going right before we had this done. So we replaced them both and we still have very little heat. One of the water pipes is cooler than the other.



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Hi if the heater fan is working properly and blowing into the jeep then that rules out the fan being the problem and depending on how the temp switch works it will either be cable switch ie when you turn the dial it pulls cable adjusting the flaps near the heater rad allowing hot air in or blocking it off so it just let cold air in from the outside.
Now if its an electronic switch this could be your problem you can take switch out and clean the contacts
Is the loss of heat the reason you changed the rad and thermstat or has this problem come after you changed the rad and thermstat.
If the problem occured after you fitted rad and thermstat then your problem is 100% blocked air in water system if this is the case then you need to bleed the system getting all the air out.
What you need to look for is plastic screws attached to any water hose dont undo these with engine hot as the pressure will force water out burning whoever is doing it with cool engine undo these and let any air out.
If air isnt the problem then you will need to replace the heater switch one way of checking for air is by touching the water pipes when engine has been running and see if their is any temp differance anyway its worth bleeding the system anyway just to rule this out.
The heater works off seperat rad that is fed by the main rad the heater rad is located towards back of engine towards the bottom you will see two water pipes running into the bulk head these are the feed and return pipes for the heater rad if you get the engine warm enough to open the thermostat for few minutes then touch both of these for temp if it is an air isuue then one will be cooler than the other let me know ok

Posted on Feb 12, 2008

  • paul proctor Feb 12, 2008

    If thats the case and ones coller than the other this usually means one of two problems the first being thermostat but if you replaced this and are sure its working then that wont be the problem the most likely cause is air in the system their should be bleed screws located on some of the pipes also you know the water bottle where you fill up the water is their a thinner pipe that goes into the top of bottle but not into the water im not sure depending on you year if it has this.
    If it does then pull this off the bottle and put it lower than the bottle and see if the water comes out of it listen for air once you have water coming out put it back on or if you dont have this pipe .
    1. Take the water filler cap off and leave off
    2. pump the water by hand by sqeuzing the water pipes squeze the thicker ones towards the bottom of rad press them quick and hard this should pump the air round the engine and out into the filler water tank.
    3. if you watch the filler tank you should see air bubbles coming into the water from the bottom.
    The best thing to do is follow the water pipes and any that have a bend in give these a few good squezes and this should pump the air around and out ok.
    Let me know once you done this then i can assist you further also you can check the thermostat by placing it in boiling water and see if the bellow open allowing water through but well try this after you tried pumping the air through.
    Im offline till morning time here is 23:40 uk time im back on line about 10:30 am uk time so speak then ok



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