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Re: lack of heat
Switching the hoses is not recommended for trying to clear out a heater core because the coolant is meant to flow in one direction. you can try disconnecting the hoses from the heater core and flushing the core itself with a garden hose with low pressure in one direction for a few minutes and then switch and backflush the heater core. this is ok as long as the heater core is isolated from the engine cooling system. BUT if it is rusted pretty badly there is a chance it can develop a leak or blow out during the process so try it cautiously!! if the core is in-fact blocked you will have very little flow through the core and you will see what looks like rust coming out of the core, it may take quite a few times switching back and forth to clear it out. if it still remains blocked or if it starts leaking inside the car it will need to be replaced.
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Could be low on antifreeze. The heater core is the highest spot in the cooling system and it may develop an air pocket. Another possibility is the thermostat is stuck partially open and doesn't let the engine warm correctly, watch your temp gauge on the dash and see if it comes up to the middle like it should while idling. If it doesn't, it may need replacement.
check coolant level first. possible bad thermostat, blockage, heater core is bad. check to see if a hose going into heater core is hot, if the hose is hot and the other is cold you have a blockage in heater core. if so, sometimes you can remove the hose from heater core and flush it out with a garden hose. if above fails, flush whole system.
Either the heater core is pluged with rust,or maybe some one has used stop leak in the radiator,and caused a blockage.You can take one hose off the heater core,and the other hose off the thermostat housing.Take a garden hose to the one you took from the thermostat housing and see if it is plugged.If you get a good stream out the other end it is ok.Then the other most common thing is where the hose that goes in the intake is narrow and often gets plugged with rust or corrosion.When you take that hose off,you will be able to see the blockage if it is that.
Are the heater core hoses getting hot? That could be a blockage in the intake manifold or engine block. Is the blend door sticking? That would be one item that would make for lukewarm air if the hoses feel nice and hot when up to operating temperature.
With the engine warm and the heat turned on, feel the hoses going through the firewall to the heater core. If one is hot and the other cold, you have a clogged heater core which must be backflushed to clear a blockage.
If the hoses are both cold, move up the hoses until you find a valve. This is the heater control valve. If it is hot on one side of the valve, that valve is clogged or shut. Investigate why the valve is not passing coolant - a clog or the actuator is broken/disconnected.
If both sides of the heater control valve are cold, replace the thermostat. While you have the thermostat housing open, make sure there are no blockages in the connection pipes.
If u have issues with heatting may be this will help.
1- If the carpet under
the heater core is damp, or if antifreeze vapor or steam is coming
through the vents, the heater core is leaking.Remove it and install a new unit (most radiator shops will not repair a leaking heater core.
1 - If the air coming out of the heater vents isn't hot, the problem could stem from any of the following causes:
The thermostat is stuck open, previnting the engine
coolant from warming enough to carry heat to the heater core. Replace
There is a blockage in the system, Preventing the
flow of coolant through heater core. Feel both heater hoses the
firewall. They should be hot.if one of them is cold, there is an
obstruction in one of the hoses or in the heater core,or the heater
control valve is shut. Detach the hoses and back flush the heater core
with a water hose. If the heater core is clear but circulation is
impeded, remove the two hoses and flush them out with a water hose.
If flushing fails to remove the blockage from the heater core, the coremust replaced.