Question about 1994 Pontiac Firebird

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There is a small part under the thermostat on my 1994 pontia firebird, on the auto parts they have told me that part is called water pump bypass, my cuestion is, does the coolant needs to circulate trought that part?? becouse seems to be plagged and i don`t have any heat on my car.

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  • Pontiac Master
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Yes it is supposed to go through bypass. if it is plugged flush out the coolant system, and refill with coolant. go to any auto parts place and buy radiator flush.

Posted on Nov 12, 2009

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Posted on Jan 02, 2017

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I have 1994 firebird with a LT1 it keep running hot and over flowing


This could be a number of things:

How long has it been since belts, hoses and antifreeze have been changed? If more than 3- 4 years, start there and also replace the thermostat.

If the temp gauge climbs steadily and then drops down, replace the thermostat, taking into account the age of belts, hoses and antifreeze if they need to be changed out.

Consider whether the cooling system is full and if it has a 50/50 mix of coolant and water or more water than coolant. If the latter and all else has been maintained timely, drain and refill with the proper mix.

Do you have any leaks showing that might indicate that the water pump is bad. check the pump itself for signs of coolant coming out of the weep hole, which is a sign that the pump is going out.

Do the cooling fans come on when the car is hot? if not, you will need to repair.

If none of that , it could be the radiator has a plug somewhere.

Aug 06, 2011 | 1994 Pontiac Firebird

1 Answer

Changed water pump,thermostat, top rad. hose. still leaking leaking antifreeze from what looks like below thermostat housing. have noticed super small hose from water pump to engine. looks hard to replace....


That is called the bypass hose. It could be leaking but I'd take a closer look at the thermostat housing. If you replaced only the thermostat and not the housing, the housing may be leaking. It's a common source of coolant leaks.

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Water pump might not be flowing fast enough. Be sure fans actually turn on instead of just sitting there. Change oil. You could have something in the motor causing excessive heat. Piston friction or cam problems ect. Try a synthetic oil.

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My car overheats and i was told i need dual fans instead of just one. i replaced the water pump radiator and thermostat


instead of replaced water pump, thermo, install ext fans, u should cx the head gasket.

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I have a 2002 pontiac firebird v-6 3800. The heater hoses run into a part that is attached to the motor. I am trying to find the name of the part so I can replace it or find an engine diagram for that...


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Perhaps the part is the bypass valve, which causes the heated water to "bypass" the heater core if the core is restricted.

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The bypass hose from the waterpump to the intake is leaking. It is about four inches long and is directly under the ac compressor and bracket.

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