acott207

ok jeep lovers here is a mystery for you! i have a 2000 grand cherokee 4.7l with no heat recently replaced the radiator because the plastic tanks had craked an were leaking an replace the thermostate with a 195 one an could not get the coolin system to preasurize i then changed the water pump an no diffrenece then the cap it has a 20 psi cap on it, i then changed the thermostate again an now it will presurize but still no heat the blend doors have been checked and the rec. door has been checked both lines for the heater core are hot an are with in 10 degrees of each outher around 180-160 pretty much all the time an all i get is 90 degree heat tops. i have flushed out the core an still nothing is thier something i am missing i really dont want to change out the heater core any sugestions?

Hymie

90 degress is 32C (in real money) - and at that temperature you'd be sweating, or do you mean that the cabin vent outlet temperature?

I have a 2000WJ and I would say that the heat output to the cabin is poor.
I have the blend doors fixed in the up position and I would say that on a cold day in the UK (outside temperature <10C (<50F)) the cabin temperature will not reach 25C (77F).

mart

hi just joined,my problem no heat in vehicle slight leak in system heater matrix replaced perfect please try all other options expensive!!!

dave1123

Hi Mart, welcome to CF. Please use something beside a cell phone or add punctuation and a little more info. Do you have dual zone climate control or the standard heater. I think you should make sure you have all the air out of the system and that both your heater hoses are hot. We can go from there.

David Sprowl

I had the same issue. I have a dual auto heat system in mine. Both my blend doors worked and the thermostat was fine as well. Mine is and 02. Used a Calcium Lime Rust removal product. One small bottle worked for me. I poured the product into the return line from the heater core (should be the cooler of the 2). If both lines are hot something tells me that your heater core is still clogged. I let the product set 2.5 hours. I poured the product into the return side and let the inlet side be my exit. I used distilled water (4.5 gallons) and low air pressure to flush the crud out. First time I tried I let is set for one hour and pretty much got nothing out. Second time the crud came out in fine flakey chunks. The earlier reply was correct that you might still have and air lock. I have a bleeder valve on my coolant system and you should refill the coolant from there. This trick restored HOT heat for me. I poured a small amount of water in at a time and blew it out with compressed air turned low and used and air gun to control the blast. It took me six hours, but again it worked. Good Luck and happy motoring