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For the heating blowing cold
Air Lock
Low Coolant Level
Blend Door Actuators not working
Water valve not opening, some are electrically operated (fuse?).
For overheating
Low Coolant level
Air lock
New thermostat faulty
Radiator blocked
Cooling fan not running
When you put in a new thermostat, and refill the system, you have to burp the air out of it. There are videos online, but you fill the system by the radiator (are opposed to the filler bottle) and turn the heater on full to fully open the valve. Then you run the engine and keep topping it up, occasionally squeezing the bottom radiator hose. When the cooling fan kicks in, you know it is up to full running temperature. Rev the engine a few times, and turn off. Then top up one last time and put the radiator filler cap back on. Then top up the coolant reservoir to the line and put the top back on that. All done!
If the heater is blowing cold air and the car is overheating, it is likely that the problem is related to the engine cooling system as well. The following are some issues that may be causing the heater to blow cold air:
Low coolant levels
A plugged/clogged heater core
A faulty thermostat (thermostat that is stuck)
Broken blower and/or blower motor
Heater core bypass hoses that have leaks
Heater core bypass hoses that are worn
If your car is overheating and/or your heater is not working, it should be inspected and diagnosed as soon as possible.
May be a defective thermostat or place in the wrong direction. If it's properly installed, might want to check the fan operation which may be producing the overheating.
If fan is good, one way to remove air in the coolant system is to run vehicle while all heaters on. take extra coolant and stop along the way to top off if needed. While driving, keep listening for the fan to begin running when vehicle reaches high temperatures.
If you continue to experience overheating, may want to take to a local known repair shop for further troubleshooting.
yes, but it's designed to drive the air out as long as you open the cap and run it until it's hot, keeping the radiator full. Eventually the air will come out and heater hoses should get coolant.
1st you need to make sure no air in your system open you radaiator cap and your heater to max and see if air bubles or circulation is going on fill up accordingly otherwise you have blockage in your system or water pump if no circulation ////make sure no bubles all bubles should be gone////look for coolant circulation in your radiator make sure your thermostat is not defective or placed in the right position.
If you are not getting heat now, it's because you have an air lock in the system. sometimes it can be difficult to burp the system. try turning the heater on high in the defrost position. run your vehicle with the rad cap off and keep the engine running at about 1500 rpm. That should give the waterpump enough momentom to purge the air through the engine. check around the heater hose area and around the thermostat area for any bleeder screws ( sometimes these vehicles will have 2 or 3 for ease of purging the air). hope this helps and if you need any other info please don't hesitate to write.
You also could have air in your coolant system. You can't just add coolant on these models after you drain the system or let it run low on coolant. The degas bottles on these models also have a flaw, where they crack along a seam. Sometimes coolant will leak, sometimes not, depending on how high the crack is on the bottle. But what it is guaranteed to do is allow air into your system, which can cause havoc with overheating (air surrounds the thermostat so it doesn't open) and keep coolant from flowing, particularly through the highest point in the system: the heater core. There is a heater core bleeder valve attached to a line near the top of the degas bottle (next to the expension line up top) with a plastic, flathead srewdriver face. Turn the heat on high and run the system at idle for 5 minutes. Then open the valve and keep it open until a steady stream of coolant comes out. (It's like bleeding your brakes.) That will clear any air from the system and at least give you peace of mind that this is not your problem. Then run the motor at 2000 rpms, with the heat still on high, for about 5 minutes or until hot air starts coming out. Release the bleeder valve again until a steady stream comes out. Then let the system cool and check your coolant level and fill as needed. I'd pull the degas bottle and inspect it...should have been a recall.
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