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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I am having the same issue. The dealer replaced the thermostat and flushed the system. 1st day from shop heater was working great. But the next morning cold luke warm to cold air again. Checked the Blend door and re-circ door and all are in good shape and working correctly. So what is it now before I go back to the dealer!
I have a 2000 grand cherokee limited. Last year I had a new heater core put in. This winter I have hardly had any heat coming from my heater. I run it on high and it throws out lukewarm heat. I really freeze on zero days. I have since taken it to the guy who put in my heater core last year. i'm hoping he can get it fixed. i will let everyone know if he finds the problem. It is currently in the shop at this moment. But the other day, I went to turn my lights on and my headlights wouldn't come on. Took it to the sho and they checked all fuses. The next day it started working again. all fuses were fine. They think it might be the switch. Then a few weeks ago, It would not start. It just made a clicking noise and all my guages lit up orange and flickered back and forth. Has anyone had any electrical problems such as this? I have had 3 jeeps and love them, but this one is driving me nuts the past few months.
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