Overheating toyota landcruise1999

expensive parts first. ouch.
ck neg
pressure test passes?
as in it didnt leak down, so is good.?

ovreheating moving or stopped or both?

1. bad cap wrong cap. on rad.
2. bad thermosat.
3. pump impeller, rusted to gone.
4. fan dead, on rad.
5. dirt on front of rad or infront of a/c condensor, blocking all air.
6. not running 50% AF
7. system not holding full pressure 12-14psi. top rad hose never gets hard.
8. system never flushed and full of red(or?) mud all over, packed with crud.

cause of engine overheating is either the rad fan not working well or luck of circulation of coolant through the engine, if rad fan is working well then might be your radiator {rusty,dirt or clog rad core or leak} make sure your rad cap and all hose and clamp is in good condition as well not preventing any air getting in the system or escaping coolant check also or replace the thermostat might be defective

The foward fan only works with ac, sounds like a poor circulation problem ensure the rad is in good condition. You could also try a lower temp thermostat 160 degrees instead of a 190.

well it sounds like your coolant temp sensor is bad that is what turns your fans on and on also since you are going to loose rad fluid when you change sensor replace thermostat to simple and cheap both thermostat usally right were the upper rad hose meets engine block aka water outlet and the coolant temp sensor is located in the side of the block also cheap and easy to change


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I'd start with replacing thermostat (that's the most common fault) Other possibilities; waterpump,leaky hose, radiator cap (not holding pressure), fan belt broken. I'd inspect for belt & leaks - if good replace thermostat.

Start with the cheapest part and that would be the thermostat. They are easy to replace and that appears to be the issue. They do wear out or stick.

Hi
Check for plugged exhaust system. If plugged will cause overheating and misfiring of all cylinders.

you could have an air lock in the system. Run with rad cap off and cycle the thermostat, adding coolant as required. Or a possible heater core.

with a 1993 you do not want to run it with out the thermostat it will damage the engine but you might want to try getting a low temp thermostat from advance auto parts and try that

First you need to make sure the fans are coming on and if they are make sure they are coming on when the car is over heating because there is a fan relay by your fuses if its going bad it wont turn the fans on or it willl only turn them on sometimes..