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Re: Air in cooling system 1989 Chevy Celebrity
If you have a V-6, there's a tube that runs along the front of the engine. It has a small nut on it. With the car turned off, take your radiator cap off, take the nut off the tube, start adding antifreeze to the radiator and when it all starts coming out in a stream, put the nut back on the tube. Then check your antifreeze level. Your done. Hope this is helpful. PHil
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Most likely you have air trapped in your engine, particularly in the heater loop. You need to properly bleed the air out of your radiator cooling system. The hot and cold blasts of air coming from first hot water followed by air.
Read up on how to bleed air out of your radiator system. Some systems are very difficult to bleed.
If after doing a good bleed of the radiator system the problem returns, you may have a bad head gasket or other leak in your cooling system which is injecting air into the cooling system (radiator/water cooling system).
If the cooling system has air in it, yes you have to bleed it. If there is no small fitting on top of the engine to allow air to escape, you have to run the engine with the radiator cap or filler tank cap loose until the thermostat opens, then add more coolant. I wonder about air in the system if it did not run hot right after you installed the radiator. Is it possible you are leaking coolant somewhere, or burning it out the exhaust ?
The generic method of bleeding air from the cooling system of any car or truck is to use a floor jack and raise the front of the car as high as poss, then fill the coolant recovery tank full and run the engine until it just starts to overheat, high end of normal zone on gauge, then shut the engine down and run cold water over the radiator core, this will self bleed the system and the coolant will be pulled from the recovery tank, repeat as necessary, never let the recovery tank run dry or more air will be pulled into the cooling systeml , if it still overheats then you need to have the head gaskets checked with a gas analyzer for hydrocarbons present in the radiator or recovery tank
There is probably still just some air in the system, it only takes a small amount to have no pedal. Did you bench bleed the master cyl before installing? Start bleeding the brakes again, start with the wheel the greatest distance from the master cyl. bleeding until no air is evident, working your way closer to the master cyl, doing the closest wheel to it last. Check all the new brake line connections. A slightly loose connection would allow air into the system, making it impossible to bleed it all out. Make sure the master cyl level never drops too low, or you will be pulling in air and have to start all over. Good luck.
Sounds like air in system, does the temp guage fluxuwate or run higher than normal? or heater thros little or no heat? Do the cooling fans come one like they always have? thies are all signs of air in cooling system, and needs to be bleed out.