Question about 2000 Jeep Grand Cherokee
HEATER WILL NOT GET WARM, I GET A SMALL AMOUNT OF HEAT IF I TRUN THE HEATER CONTROLL OFF. BUT THEN IT GET COLD AND STAYS COLD.
If your heater is not blowing warm air, your thermostat is probably sticking or your coolant level is critically low. When you start your vehicle, your radiator coolant begins warming up from being cycled through your engine block. One the cooland reaches a certain temperature (usually 130-150 degrees F.), your thermostat spring will retract and allow coolant to then pass into your heater core. However, if your coolant level gets too low, or if you are using a coolant mixture that has more water than antifreeze, thermostats have a tendency to rust and corrode and will stick. Thermostats can also go bad for what seems like no reason at all. The good thing is that usually thermostats are pretty easy to replace. It's the most common thing that would cause the problem that you're explaining. However, if changing the thermostat doesn't fix the issue, there is always the possibility that you could have a collapsed hose somewhere under your hood. If you change your thermostat and none of your hoses are in bad shape, you most likely will have a vacuum line to reconnect under the dash, as most heater controls in late model vehicles are vacuum operated. I'm almost positive that the thermostat will be your culprit though. **Make sure when installing the new thermostat that you use a new gasket or O-ring, whichever applies. Afterwards, start the vehicle and watch to see if you have any leaks around the thermostat housing and continue to observe until the temperature of the vehicle gets to normal operation temperature.
I hope this helps, and hopefully you'll have heat pumping through your vents in no time at all!
Have a great day and try to keep warm!
Posted on Nov 23, 2008
So i have the same problem and it just happened after they repaired my radiator, so i took it back to the shop and they replaced the thermostat, but it still blows out cold air. what now?
Posted on Jan 19, 2009
Had the same heater problems for a 1-1/2 years. Solved the problem by disconnecting both heater lines and purging the air out of the heater core with a garden hose.
Posted on Dec 07, 2009
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Posted on Jan 02, 2017
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