Hold on tiger, before you do anything else, Bleed your radiator.
Get the car on a very steep incline, front of the car up high (you want the top of the radiator above the heater core in the cabin. This way, gravity helps you get the air to the front of the system.), start the engine, put heater on MAX heat w/ all vents open, and open the bleeder screw right next to the radiator fill cap. After the engine is warmed up (water temp needle vertical) rev the engine to 2.5-3.5K rpm to get the water pump spinning fast enough. (you may want a friend to do this and watch your temps, unless you don't care and feel comfy reaching under the throttle body and rotating the cable cams - NOTE: Careful, the rev limiter may not be able to stop you from over-revving manually! I do not know if the ECU will kill the injectors and spark or just cut the throttle) You need to bleed the engine until no more bubbles are coming out of the bleeder port and the hoses feel firm (careful they get *HOT*) - IE: don't have any air bubbles in them. (mainly the return hose on the driver's side of the car, if your facing the engine bay, the right hose) This process can take some time, you will probably make a mess and use lots of 50/50 mix of antifreeze. It's ok to have the radiator cap off before you start the procedure and probably a good idea since doing this will suck lots of coolant into the system when the air gets replaced and you will need to replenish the reservoir. (BE CAREFUL opening the cap if it is hot, the system is designed to be able to run under pressure - so open it slowly and listen to any hisses - wait for any hiss to stop before you unscrew further)
Trust me on this one, if your system is NOT bled correctly, hot coolant will not reach the heater core until the engine is rotating fast enough to push water through the heater core. Coolant wont flow through there on it's own if there is air trapped in the system and requires the extra minute pressure that is created when the pump spins faster. If your engine got a little to hot and boiled off some coolant, even if you replaced it, it can most definitely have ingested some air. You can't just fill the expansion tank until it stays full and be done with it, unfortunately our cars are a little to complex for that >: |
After your system is bled properly, and this STILL happens, THEN begin looking to replace parts. Start with the basics. Besides, if you replace a part, you have to bleed the coolant again anyways which will most likely fix the problem when you thought it was the part all along.
note: the PLASTIC water pumps fail catastrophically, they don't slowly wear down. Also, the plastic impeller water pumps were only put on early model cars. Since you said yours is definately metal, your ok on that)
I can't believe you guys already started to tell him to replace parts...
Last edited by bitcore; 11-08-2006 at 02:59 AM.