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Re: Heating system only works slighty and never very hot.
Check your antifreeze level. Make sure you are not leaking any coolant. Your thermostat may only be opening slightly which would be a sign to replace it.Then troubleshoot your fuel pump and filter and hoses.
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There are several possible reasons why you may be experiencing cool or no heat in your 2002 Jeep Grand Cherokee Laredo after replacing the thermostat and bleeding the air out of the lines. Some possible causes could include:
A malfunctioning blend door or actuator: The blend door controls the mix of hot and cold air that is directed through the heating system. If the blend door or actuator is not functioning properly, it may cause a lack of heat.
A clogged heater core: The heater core is responsible for transferring heat from the engine to the cabin of the vehicle. If the heater core is clogged, it may not be able to transfer heat effectively, resulting in cool or no heat.
A faulty thermostat: If the thermostat was not properly installed or is not functioning correctly, it may cause the heating system to not work properly.
A problem with the water pump: The water pump is responsible for circulating coolant through the engine and heating system. If the water pump is not functioning properly, it may cause a lack of heat.
Hi Jeff. I had the same problem, along with others on my 03 Denali. Along with not blowing hot air from the rear heating system, I had hot air blowing out of the passenger side and cold air out of the drivers' side vents. My battery would go low and had the same smell. I took my Denali in to the dealer and they found it was a bad Fan Control Module. They replace it and everything worked well after. It cost me $293 for parts and labor. Hope this helps.
Your cooling system is low on water the hot rating is coming from the air in the system super heating and then the coolant circulates through bringing the temp reading back down.
It is possible that somehow your heater core is either blocked or airlocked. Best thing to do is to feel the two hoses that go to and from the heater core when the engine is up to normal operating temperature. If one hose is hot and the other is barely warm than you have a blocked up heater core. If you feel both hoses and they are barely warm than it is possible that you have an airlock in the system. The airlock is mostly likely to occur if you have recently had your heating system worked on such as a new radiator, thermastat, etc. If both hoses are hot then it could possibly be the heater blend doors inside the heater box could be stuck in the cold position. They are controlled from the switches on the dash. When you adjust the heat setting on the dial from hot to cold or cold to hot it moves the blend doors to either let more cold air in or more heat in. Hope this was helpful. Happy motoring.
How is the problem with your mark? Has it been resolved? Is it physically overheating or does it just look like its hot? Have you swapped the sending unit for the coolant temp gauge?
you could also have a cracked or pitted head letting water into your cylinders .check to see if you are blowing water out of your exhaust if you rev slighty.this happenes if you do not use coolrant .straight water is not a good idea with aluminium heads,can cause corrosion
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