What cpuld be the reason water isnt going thru the system but backing up at motor? Overheating. Replaced water pump and thermostate but still not cycling water thru.


Asked by Oct 03, 2014 at 09:21 AM about the 1991 Chevrolet Corsica LT Sedan FWD

Question type: Maintenance & Repair

Started leaking from radiator. Put in stop
leak. When my guy investigated it was
from the empty out valve on bottom. So i
flushed radiator and resovior. Then it
started overheating and leaking water at
that time from the outgoing hose
(radaiator side) to entrance hose on the
motor. Changed thermostat. Same thing
again. Changed water pump. Still doing
it! Any ideas. This car may be old but it
is my transportation and i love Blue.

11 Answers


Some cars age like dogs. 7 to 1. That makes your Corsica about 161 years old. You can equate the engine problem to a hart attack. The head gasket is blown. And in a car that old it's best to put it out to pasture AKA junkyard. Good bye old friend.


Not the head gasket. No smoke or leakage of oil. Has lost no motor pressure and still great on gas. Even with the over heating. No miss fires either. I thinking a blockage. Original motor. With only 152k miles. Third owner. First drove to store and back only. Second had it 3 months and lost the krys and sold to me with 103k. Owned it 5 yrs now.

1 people found this helpful.

The stop leak you put in to stop radiator leak,and i know you flushed it out,but in my opinon,it is blocking coolant from circulating thew the head,the ports, in the head over time biuld,s up deposit,s from water and anti freeze,along with the stop leak it has clogged the port,s and will not let the water circulate,the only fix for this i would think is,remove head and have the water ports, cleared of the stop leak.


Possibly some type of blockage in the water jackets in the engine block? Try taking the thermostat right out for maximum flow.


Ahhhh. Then there's still some life to be had with the old girl. Have you considered replacing the radiator? The Stop Leak in addition to blocking the hole has also plunged up the cooling fins in the radiator. Thus the cooling abilities have been greatly reduced.

1 people found this helpful.

Agree,there could be blockage,in radiator all so,


One good way to test this,is remove cap,crank car,let it get to correct tempreture,and you should see water circulating in the radiator,if you do see water moving,then do as Bmark said,get you a new radiator.


Ok removed the thernostate and ran it without the cap. I csn see it moving a bit but still overheating and when i turn off the hose from rad. To motor is still bloating and leaking from the radiator side. Before i did thermostate and waterpump it was leaking out motor side.


Would flush cleaner possibly remove blockage if i run it thru system. I only flush the radiator and resivior not the whole system.


It,s worth a shot,you have nothing to loose at this point.


If the radiator is the original then it's time for a replacement. Or you can remove it and have a radiator shop "boil" it out. But still no promise that will cure the problem.

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