Car overheats at idle and top radiator hose has massive pressure. when i bleed system through bleeder valve nothing but steam brand new radiator;thermostat;radiator cap;water pump temp switch; dont know wt else to do.
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Re: 1990 honda civic Dx 1.5L
Have someone do a Block test of the cooling system to determine if you have a headgasket problem seems likely that that is your problem, or pull the plugs connect a cooling system pressure tester and pump ot up to 20 psi or more and leave it there if it drops pump it up again, leave it there for an hour or so and keep looking into the cylinders for evidence of coolant if you see any you have a head gasket problem.
Try bleeding the air out of the cooling system right after you start the motor up. this will allow you to get all the air out but not steam. do this until the coolent comes out. common cause, it could be vapor locking and not letting the coolent flow causing OVERHEATING. hope this helps
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Idle hunting is a favorite hobby of Hondas. The most common cause is a bubble in the coolant - if the coolant is drained and refilled without bleeding the system it will do that. Look at the housings where the radiator hoses attach to the engine. On top of one of them will be a nipple, like a brake bleeder nipple but larger. Open it half a turn and close it when a steady stream of coolant comes out.
Hi, I have a way to test for a blown head gasket. Since you have good compression, yours would have to be small. Recommend you park on an incline, remove the radiator cap, set the heater on high, start the car and let it warm up until there is flow in the radiator. Fill the radiator and keep it full while the engine continues to run. Look for any bleed ports the system may have either in the hoses or at the attach point housings. Crack any bleeders open to allow any air out. Top off the radiator all the way to the neck and make sure there are no bubbles coming up. Bubbles coming out the radiator are an indication of a blown head gasket. Please let me know if you have questions, and thanks for using FixYa.
I would recommend that you bleed all air out of the cooling system. The bleeder valve is located on top of the engine. Once engine starts to overheat or when you can hear bubbling back into the overflow bottle, turn car off and open bleeder valve. If you see bubbling you have air in your system. Bleed the system a couple of times and see if this helps.A heat sensor sending unit which controls activation of the electric fan could also have failed.But if the heat sensor is properly working then check the radiator cap is it properly fitted or got loose.If its loose it will release the pressure and car will overheat.But if the radiator cap is properly closed.Then its time to check the HEAD GASKET.As you have replaced the head gasket still get it checked is it overheating very quickly or is the head gasket placed properly also check the coolant level in the car.Thanks. you can rate this solution and show your appreciation.
Be sure your radiator/cooling system is full. In many cases there is a bleeder valve to release air. If there is none, 'bleed' air at top radiator hose. Remember, this system is under pressure, you can burn yourself badly if U dont follow proper procedure. Look it up in your repair manual.
When the vehicle overheats, do u check the water/coolant level in the radiator? If it has reduced, it means ur leaking and u should inpsect to c where the leak is coming from. If the level has remained the same, probably ports are blocked or something to that effect. Keep me posted though
I had the same problem with my 1993 Liberty LX. Remove the thermostat (located inside bottom radiator hose engine connection - take the connection off and thermostat is inside). Reassemble (minus thermostat), reconnect bottom hose. Slowly (very, very slowly) refill the radiator and remove the bleed plug ( located beside the top hose connection to the radiator - a black square plug with a phillips head cross in the middle). When the radiator is full and clear water (no air bubbles) is coming out of the bleed point, replace the bleed plug and then the radiator cap.
Run the engine for five minutes (approx) or until normal engine temperature is reached. Allow the engine to cool down and recheck the water level - fill if necessary ensuring that the bleed plug is open and clear water is coming out of that point. Replace Bleed plug and then radiator cap. Run engine for five minutes (approx) and then test dive. If the engine overheats keep filling the radiator until there are no air bubbles coming from out of the bleed point.
This fixed my overheating problem. Good luck and safe motoring.