I was hoping that some one here might be able to help.
My parents have a '94 Buick Regal 3.1 L. The freeze plug corroded
through. So, my father was going to pull the freeze plug and replace
it. The first problem was that since the engine is mounted sideways
in this model vehicle and the plug that corroded through was towards
the firewall of the vehicle. Not having the knowledge to pull the
engine he released the motor mounts and pulled the engine forward. He
was able to get some access to the plug; however, it would not pull
out. In his frustration to pull the freeze plug, he just kept making
the hole larger and larger. Anyway he was not able to get the plug
out, but left a rather large hole instead. Still not thinking that he
could pull the engine, he used some JB Weld to form a type of plug and
placed it in the middle of the hole in the freeze plug. Of course the
putty also filled into the block. He allowed it to set for the night.
After the weld set, he filled the radiator and block with coolant and
water. The temp gauge then rose to about 250 degrees after
approximately ¾ miles driving distance and he noted that the water
pump was leaking and the radiator fan would not turn on. He replaced
the pump and the fan temp sensor (or whatever you call it). The senor
still would not engage the fan, but when he jumps the fan connection
and bypasses the senor the fans work without difficulty. The Temp
gauge would still rise rapidly and it seemed to overheat. We then
replaced the radiator with the thought that there was a restriction of
water flow through the radiator (due to his use of radiator stop
leak). Still no success. It seems that we have replaced damn near
everything in the cooling system. So my question is. Is it possible
that his use of the epoxy plug (which is still secure in place) may be
restricting the flow through the engine block and causing this
overheating problem? Is it possible that a temperature sending unit
is giving a false temperature reading? Or just what else could be the
Thank you for any help,
Are you sure your father is not a customer of mine? Because they would
do something like that.
Really my best advise is to pull the engine out. Even for a novice
it shouldn't take more then 10 hours to remove and replace. In Regal you
have room to access everything holding it in with ease.
One you have it out, take a flat blade screwdriver and tap the freeze
plug's top edge in. When it starts to rotate, grasp it with a pair of
pliers, and pull it out.
Then you need to remove the water pump. Running fresh water from the
Thermostat housing (with the thermostat removed) and the water pump housing,
you can tell if your getting flow. If you are, do a compression check. If
it passes, replace all the freeze plugs. Get a new water pump, have the
radiator flushed, and a new thermostat. As well as a new coolant temp
sensor, and fan sensor.
If not pull the heads, and look for the blockage one water jacket at
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