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Yes getting air out of the coolant lines can sometimes help. And the heater hose valve at the firewall is the place to do it. But if you have a bad thermostat or blocked heater core then it won't really help. On my 2000 v6 Passat a coolant flushing helped for a while. But then it became clear that the thermostat was the likely problem, And that's a big job, Basically a timing belt/waterpump job.
You don't need to remove the engine. The basic procedure to access the timing belt for the Hyndai Cars is: Raise and support your car in jack stands. Remove the passenger side wheel, and the splash guard. You have to remove the accessory belts, water pump pulley, remove crank shaft pulley, and then remove the upper and lover timing belt covers. If you decide to do this job by yourself, you need a lot of information. Only a mistake and the valves might be bent. A good start point is Haynes Repair Manual specific for your car. You ca buy it on line, at farm & fleet store, or any car parts store. Hope this will help.
take a look at the waterpump, these cars have problems with waterpump leaking, take caution, the waterpump is driven by the timing belt,if that belt pops or jumps due to coolant leaking on it and causing it to fail,then you will have a costly repair,i belive its about $4,000 to fix, it will cause cylinder head valves to bent, have this coolant leak check asap.
Check the radiator hoses for a leak. The splatter was most likely the coolant/anti-freeze leaking from one of the hoses. Loss of coolant would make the temp rise and the engine overheat. If the hoses are good, look for seepage around the waterpump. These are the main causes for coolant loss.
2.7 engine located above the starter. You need to remove the starter outherwise its fairly easy.
The 2.4 & 3.5 engine, its located in the front next to the timing belt, a little more complicated to to install.
There is a pipe that connects to the rear of the waterpump right where you say it is leaking. I would guess the seal is leaking. Since you have to remove the pump to replace the seal, you should replace the waterpump.
These engines commonly blow the headgasket when overheated, and commonly overheat and leak coolant when the headgasket is blown. So it may be hard to say what came first, but either way you will need to determine if the headgasket is OK before you make any repairs.
Check coolant level, then start engine until it is warm and the thermostat opens. You will tell when it does when the needle on your temp gauge goes cold when it reaches around 180-200* and then goes back up. Now turn on your heater full blast and go to the engine compartment. You will see a heater valve located on the passenger side, next to the washer reservoir. It is a black thing with 4 heater hoses connected to it. Feel the hoses. When everything is working correctly it should be like this:
Hose going to waterpump will be hot
Hose going to (I think the thermostat housing) will be hot
2 Hoses going to heater core (mounted behind firewall) will be hot
1. If only 1 heater core hose is hot, heater core is clogged--
UNCLOG: remove 2 hoses going to heater core when engine is cool, hook water hose end to one of the sides and flush out gunk from heater core. Reconnect hose and you should be good.
2. If neither hose core hose is hot, heater control valve is bad or vacuum is bad--
Test Vacuum: remove vacuum line from heater control valve, you should feel the vacuum **** on it when pressed to your cheek and the heater control valve actuator should move when you unhook the vacuum line. If you have a good vacuum, it's probable the valve available at autozone part # 5941 for around $21.
To get heat while you wait to replace part, unhook silver arm on heater control valve that is hooked to the plunger. This will give you heat all of the time, but it is controlled by the bottom hot/cold switch on your heater control unit so you won't get hot in the cab. It will just circulate heat through the core.
Sounds like the water pump, it will fling coolant as it leaks when the engine is running, also check the heater hoses and if coolant seems to come from the bottom of car and not the engine then it is a heater core leak.