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Car Forum / Honda Cars / November 2004Coolant boiling in reservoir
My girlfriend has a 89 civic si, the upper radiator hose blew yesterday so I changed it and bleed the air out of the system. At the same time I changed the radiator cap. Now after 15min drive, the coolant is boiling in the reservoir but the engine is not overheating. The thermostat is two months old, the fan is working. Anyone know what it could be?? > My girlfriend has a 89 civic si, the upper radiator hose blew yesterday so I > changed it and bleed the air out of the system. At the same time I changed [quoted text clipped - 3 lines] > > Anyone know what it could be?? ======================= It's just trapped air expanding past the cap and bubbling into the expansion tank. When the engine cools down, it will suck some of the coolant into the rad and the level in the expansion tank will drop, so you must check it tomorrow A.M. 'curly' =============== To get the air out of the cooling system, wait for the engine to cool down and remove the radiator cap. Make sure the coolant is level with the bottom of the "radiator neck." If not add more coolant and make sure the coolant mixture is 50/50). If it's already at the right level or you've filled it enough, squeeze the top radiator hose to remove the air from the system and also suck in the coolant. If there's air in the coolant system the level of the coolant will drop so you have to add more coolant. Let us know how it goes. --Viktor > > My girlfriend has a 89 civic si, the upper radiator hose blew yesterday so I > > changed it and bleed the air out of the system. At the same time I changed [quoted text clipped - 14 lines] > > =============== On of the best ways to bleed the air out of a cooling system on a Honda is to use the bleeder valve. On an '89 Civic the bleeder valve is on the top of the water pipe bolted to the left side of the head. > My girlfriend has a 89 civic si, the upper radiator hose blew yesterday so I > changed it and bleed the air out of the system. At the same time I changed [quoted text clipped - 3 lines] > > Anyone know what it could be?? You received some great advice. I just wanted to add that regardless of how you solve the problem--you should check the radiator coolant level about once a day (for the next two weeks) when the engine is cold and refill it with a 50/50 mixture if it is low. Also, make sure the reservoir is about half full. Once you find the level up to the cap for two straght days--you won't have to check it anymore--your problem is solved and air is now out of the system. Don't feel bad--you would be amazed how many so called radiator experts that own or manage radiator shops make this same mistake. > > My girlfriend has a 89 civic si, the upper radiator hose blew yesterday so I > > changed it and bleed the air out of the system. At the same time I changed [quoted text clipped - 3 lines] > > > > Anyone know what it could be?? Yeah. Change the rad cap. > You received some great advice. I just wanted to add that regardless of > how you solve the problem--you should check the radiator coolant level [quoted text clipped - 5 lines] > called radiator experts that own or manage radiator shops make this same > mistake. Thanks everyone, I've added some more coolant with the bleeder valve open and ran the car for 15min and checked the reservoir, there are still some buble but way less. So I suppose that if I keep sufficient coolant level in the reservoir the air will be expulsed to the reservoir and be replaced with coolant when the engine cools. Am I right in my suposition? Thanks. > Thanks everyone, > I've added some more coolant with the bleeder valve open and [quoted text clipped - 6 lines] > > Thanks. Yes, that is true. However, it's still a good idea to check it when the engine is cold for a couple of weeks to make sure the air is out of the system. I had this same problem a couple of years ago. I made the mistake of believing the owner of the radiator shop that flushed out my cooling system knew how to bleed the air of the system. tnelson@nospam.com (T. Nelson) wrote in news:tnelson-2402041200390001@pm2- broad-158.snlo.dialup.fix.net: >> Thanks everyone, >> I've added some more coolant with the bleeder valve open and [quoted text clipped - 12 lines] > of believing the owner of the radiator shop that flushed out my cooling > system knew how to bleed the air of the system. If, for some weird reason, you filled the radiator with long life Dexcool coolant, be extra sure to remove all air from the system because air will cause rust. T. Nelson wrote: >>Thanks everyone, >>I've added some more coolant with the bleeder valve open and [quoted text clipped - 12 lines] > of believing the owner of the radiator shop that flushed out my cooling > system knew how to bleed the air of the system. And make sure you have the heater on when filling the radiator. Thats the source of air in the majority of cases. Air can also be dissolved in the water, depending on temperature, so check after letting it cool that it has gaased of and filled those points where it collects. Rev the engine slightly to move it about while having the bleeder open. Make sure it isnts too hot > Burns are common. Best to have a drink of coffee while waiting for it too cool down. Unless you like pain!!! grin!! Your radiator cap was shot, even though there is no change in appearance. Go to GI Joes and buy a new one for 10 bucks and that should fix it. -- GusTheCat |
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