Overheating Problem

hey guys, i just recently replaced the timing belt and water pump on my toyota celica 1996 st205 (5sfe engine) and now my car is overheating after roughly a 30-60 minute drive. the radiator seems to be overheating and boiling/forcing the reservoir tank out through the overflow hole. when refilling the coolant i had to use some water as the 5L bottle of 50/50 coolant i had wasn't enough. i cant see any leaks, i did see bubbles in the radiator with the cap off and engine running however i think that may be due to the reservoir tank being empty. i had never had this problem prior to the timing belt/water pump change. just wondering if anyone might have a diagnosis for this problem.

hey guys, i just recently replaced the timing belt and water pump on my toyota celica 1996 st205 (5sfe engine) and now my car is overheating after roughly a 30-60 minute drive. the radiator seems to be overheating and boiling/forcing the reservoir tank out through the overflow hole. when refilling the coolant i had to use some water as the 5L bottle of 50/50 coolant i had wasn't enough. i cant see any leaks, i did see bubbles in the radiator with the cap off and engine running however i think that may be due to the reservoir tank being empty. i had never had this problem prior to the timing belt/water pump change. just wondering if anyone might have a diagnosis for this problem.
You may still have air in the system ? Often it is difficult to remove all the air once the cooling system is opened up and requires multiple attempts to be successful . There should be bleed port somewhere on the system generally at the highest point of the system ? Do you have a manual for your Celica - might be worth investing in one .

Air in the coolant, defective pump, or possibly the belt is off a tooth.

Did you replace the t/stat?

Park the car on an uphill incline (nose up) & allow to cool. Then remove the cap and "burp" the upper hose by squeezing it until no more bubbles come out. Refill and continue this until squeezing just makes the coolant level rise and fall in the radiator. Next, turn the A/C temp control to hot and start the car and allow to warm up. However, if you have a defective thermostat or coolant fan temperature switch then watch that the temp doesn't climb too high.

Once the thermostat opens up, you will probably see some more bubbles. Add coolant to compensate and cap it once the bubbling stops. Shut the engine off and refill the reservoir.

Hope this helps!