1985 Mazda 626 water spraying out of top of rad

1985 MAZDA 626
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MTLOVE1
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Engine Cooling problem
1985 Mazda 626 4 cyl Four Wheel Drive Manual

i am guessing at the year of the car.it is an oval track stock car we just got for free.it had a rotten hose from the block to the heater core so i removed both heater core hoses and just by passed the heater core totally.so when i start the car now the coolant is super pressurized and sprays out from the rad cap.if you take the cap off it is like a fountain shooting out.do i have a blown head gasket and the exhaust is getting into the cooling system?by passing the heater core shouldn't do this.any ideas.thanks
Nov 8, 2009 at 6:22 PM
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BMRFIXIT
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If the coolant spray out the radiator cap as engine start almost for sure suspect at least a blown headgasket
Nov 8, 2009 at 7:36 PM
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MTLOVE1
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thanks for the reply.so if on start up (cold engine) the coolant just starts gushing out of the rad...you are saying that is a head gasket?so the exhaust or compression must be forcing the water out.could it be ANY other thing besides a totally blocked radiator?
Nov 8, 2009 at 10:28 PM
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BMRFIXIT
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Part stores should have a headgasket test kit
its a fluid tube that change color if exhaust gases present in the coolant system
totally blocked radiator may be the cause of the head gasket failure but I dont think its the reason that forcing the fluid out
pull spark plugs and check if wet
Nov 9, 2009 at 5:58 AM