Its a stock motor and everything, I replaced all the hoses, the radiator, and in the process of replacing a water pump. I hope this will solve the problem, but I'm sceptical because when I took the water pump off it looked great and there was no play at all. Any suggestions?

 

Its a stock motor and everything, I replaced all the hoses, the radiator, and in the process of replacing a water pump. I hope this will solve the problem, but I'm sceptical because when I took the water pump off it looked great and there was no play at all. Any suggestions?

 

I just did the same thing. I acctually had a brand new pump start leaking through the weep hole with perfect bearings. It is a very hard leak to find without acctually replacing the part or at least taking off the pulley.

Alex

 

Do you still have the stock AST?? If so,
make sure to check it for cracks...
-MP

 

It could be a couple of things. If you do not see any any water leaking, it could be the pressure when hot is putting coolant into the reserve tank and it partially collapses when the collant tries to get back in. I had this problem and replaced the overflow tube. I also had to replace my coolant caps at both locations. Make sure they are the correct pressure ones. You probably have a stock air separator tank. It is recommended that you change it out. Also change out the thermostat.

 

thanks , I'll do that

 

Yes its stock and no it has no leaks.

 

Make sure all the clamps you used are doing their job. When I replaced my radiator, the lower radiator hose clamp was defective, so I was leaking a little fluid for a couple of weeks.

 

The following thread has some information about a coolant leak and how he found/fix it:

https://www.rx7club.com/forum/showth...threadid=77631