Check all hoses, Look around the water pump for telltale trails of coolant.
It may also be a head gasket. Start your car and then go round back to the tail pipe. once the car has run for a while, there should not be any sign of steam nor a smell of coolant coming from the exhaust pipe. If there is, you'll likely need to replace the head gasket
have the head gasket replaced
For a number of years the "mirrors" were of poor quality. The entire assembly has to be replaced which is very expensive. In a number of countries Toyota replaces them for free, and I was so lucky.
Losing coolant in a vehicle is not a good thing. It is best to check all seals and all bends in tubing.
you needto take the sending unit out and check your oil pressure with a gauge. you oil pump may be losing oil pressure
Are you overheating? If so,you may have a radiator that is plugged and needs replaced. It may just be too old and is leaking still needing replaced.Third,if you have a head gasket blown,it can push the coolant out of the system.You would have to check the compression to find this problem,not a hard one to diagnose either.
I think you would know if you needed a freeze out plug for you would be losing coolant & losing coolant would make your ride run hot.
Have it pressure tested and repair the leak.
If you are losing coolant, you probably have a bad cylinder head gasket. Too much coolant system pressure will drop your engine oil pressure.
First, where is it losing all the coolant ? Is it losing the coolant in the engine, or on the outside of the engine ? You must establish this first. What was the problem before ? Is the coolant leaking from the out side, like near the water pump, or from the large tube that goes into the water pump from the rad. hose ? Is there a problem with the thermostat ? When you replaced the pump, and put in the O- ring, did you put some silicone on the O-ring to help it seal ? Is it leaking from there. Check all the hoses and clamps and the rad. Good luck.
There are a few reasons why a 1997 Toyota Camry may be losing power. A few of the reasons could be a bad battery, ignition coil, or the fuel pump.
could have a crack in it that is leaking under pressure
If there really is no leak then it is likely a head gasket allowing coolant to leak into the cylinder and go out the exhaust as steam.