BOTTOM RADITATOR HOSE AND ONE HEATER IS COLD, UPPER RAD. HOSE IS HOT, OVERHEAT LIGHT COMES ON, GAUGE WILL GO UP TO 240, RAD. FEELS COOL, OVERFLOW TANK WILL RUN OVER, SEEMS LIKE THERE IS AIR IN SYSTEM, NEW THEROSTAT, RAD. CAP,
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Re: 2002 V.W. Jetta 2.0 liter overheat
Turn your heater on to max heat and high fan. then see if you can feel the hoses on the firewall for heat they should be hot. make sure that the fan unit on the radiatoris working if the upper radiator hose is hot the fans should be running if they are not that means that either the relay is bad the thermo sensor is bad or the fan unit is shot... please rate the solution..........thanks
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check thermostat in boiling water make sure it opens. make sure it is not fitted up side down, check the radiator pressure with a gauge there may be a leaking head gasket. also check the relief valve on the radiator cap.
Possible trapped in system. Bleed system, should have two small screw bleeders, one in front of left valve cover on pipe behind water pump and the other on coolant pipe outlet as you follow upper rad. hose towards engine. Engine cool, remove rad cap, open both bleed screws and fill rad until coolant flows free out both bleed ports. close both bleed screws, rad cap off, start engine and let idle until upper hose is hot to touch , shut off, let it cool down for 20 minutes, top up rad and install cap. restart car ,drive and check.
i had something similar once, it ended up being the intake radiator hose, it has a metal coil inside, mine was broken and when you revved the motor it would **** the hose shut and overheat, but under 2000 rpm it was fine .
your car is cooking!!!! if your heater starts to blow cold air its got an air lock in the system and need to be blead out to get this air out of the water jaket in the engine sounds like your gauge is working fine to me, its screeming at you to stop! as its over heating the engine, look under your hood for the water hoses you should find a hose with a kind of nut or screw in it at the higest point on a water hose, this is the bleed point, fill the rad up with water and turn on the heater to hot only do this when the engine is COLD undo this screw or nut start the engine up and watch the water flow out this bleed point till there is no more air coming out with the water, keep the rad full of water and you dont need to put the rad cap back on till the air has been bled out but keep the rad full of water all the time after all the air is out refill the rad or top it up put the cap back on and run the motor it should not show as hot as it was and the heater should work just fine
Remove and raise upper hose at thermostat end and remove lower rad hose. Fill rad with a hose and watch for flow from bottom rad hose and/ or bottom rad hose connecton.......water should fall though rad easily. Honda rads are cheap.....any restriction....replace rad.
Remove thermostat....fill thermostat housing with hose and watch for water flow at bottom rad hose. Flush good.
Remove heater hoses.......flush back and forth until a good flow is present "With heater control set to hot" if no or poor flow....replace heater core.
Stop leak can plug everything.
Also.......not likely causing over heating....but ....at your mileage,if you do not know if the timing belt has been changed.....CHANGE IT NOW! Water pump is optional at this mileage.