This problem started after a mechanic replaced the heater core and the associated hoses. When the car was started for the first time after the work was finished it sounded great, but within five minutes the overflow tube popped off and the contents of the radiator shot out through it. The water was not hot. We ensured there was no problems with the connection to the fill bottle spout and the hose. Tightening the hose to it's limits will not hold it. The water will shoot out every time after about five minutes. Is it possible a hose is on the heater core so that pressure is going against itself?
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Re: Pontiac grand am 1994 water comes out overflow
First question: why was the heater core replaced. Was it leaking water inside the car? Or was it replaced due to no heat inside the car. If it was replaced due to no heat inside the car, the shop you had taken it to shouldn't have replaced the heater core until they conducted tests of why there was no heat even if the customer insists on replacing the heater core. The reason why I'm asking is there's a possibility of the head gasket was leaking causing the poor circulation of the water to the heater core. If so, you may have replaced the heater core for no reason and most likely cost you a bunch of money. I live by this rule in our shop: DON'T JUST THROW PARTS AT THE CAR! You 'll end up spending way more money than you needed to.
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Depends on your mechanic. I can tell you how its done: Replacing the heater core in a Pontiac Grand Am is simple enough. But reaching the core is another matter. It is positioned behind the instrument panel, which must be removed. Confirm etc--------------------------------------------------------------------------------------- vag tacho 5.0
OK START WITH COLD CAR FIND HEATER HOSES (CENTER REAR OF ENG BAY) PINCH OFF HEATER HOSES WITH NIDDLE NOSE VICE GRIPS, REMOVE HEATER HOSE'S FROM HEATER CORE TUBES ( BOTH HOSES) INSTALL WATER HOSE TO ONE SIDE OF HEATER CORE , TURN WATTER ON AND LET IT FLOW 1 MIN. SHOULD DOO THE JOB, IF NOT YOU HAVE OTHER ISSUES.OH REASIMBLE EVERY THING BACK AS IT WAS BEFORE YOU STARTED, TAKE CARE WHEN REMOVING HEATER HOSES FROM HEATER CORE MAY BREAK HEATER CORE IF YOU ARE TOO RUFF,.......
sounds like there is a blockage in the heater core. I would sugest taking the hoses loose and using a garden hose see if water can flow thur the core. If it dont flow thru the core you might have to replace the core.
first check to make sure that the hose,s back there didn't crack / of there fine then the heater core has blowen open and is know leaking / if you are in an aera that diesn't get real cold take the hoses off and route one to the other till you can get it fixed
The hose you are referring to is the drain from the heater box...gets rid of condensation from the a.c. don't connect it to anything. But, If any antifreeze (not plain water) is coming out of there, then you likely have a heater core leak. That said, if the engine is not running hot and you aren't loosing antifreeze, the level sensor in the tank is bad.
A rubber elbow coming out of the firewall is probably the a/c evaporator drain. However, the heater core could be leaking and entering the evaporator case and coming out of that drain. Are you sure coolant is coming out of that elbow and not plain water?
Take off the hoses at the bulkhead/firewall that go to te heater core, use a garden hose and back flush the core by forcing water through the smaller of the 2 hose nipples, if the water runs right through then you have a heater air temp control door actuator problem