2005 Avalon overheated after having new rad n thermostat Gauge said temp was good. Checked n no cap n I noticed left fan was broken. Car won't start. Is there a relay r vapor lockMotor turns over

Could be that the thermostat has packed up...

Check all your coolant levels are correct and then take her for a good run out....keep your eyes on the temperature gauge,,if your temp gauge hardly moves then your thermostat is at fault....replace it.

If temp gauge works fine, you may be airlocked in your heater matrix... Try setting heater to full heat with fan on full power,, whilst car is ticking over, remove radiator / expansion bottle cap carefully and start squeezing your coolant pipes. This should force any air out through your rad/bottle top..

Please be aware that as your temperature rises in the engine. Your coolant will expand and start to flow out of the rad/expansion bottle..at this stage quickly replace the cap....check your heater...leave engine to cool....unscrew rad/bottle cap, check coolant levels, top up if necessary and squeeze pipes again..start car with heater/fan on full and repeat above.....

Hope this helps..

How long was running without water?

I am not sure what you are asking here. Did you severely overheat the engine? if so that can be the cause of the no start. A far as the relay goes do you have a security light on in the dash?

It sounds like the radiator. A reverse flush might clear up the blockage.

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.

Either a stuck closed thermostat, or a blown head gasket. Have you noticed the coolant temp gauge reading higher than normal? If so there's a good chance it's the thermostat.

Thermostat and Coolant Temp Sensor is What I Recomend Replacing on this Vehicle

when i had the problem it was my themostat. easy fix, may also be your radiator cap needs to be replaced.

CHECK YOUR SPEED FAN RELAY ONE SIDE IS FOR YOUR AIR CONDITIONING YOU HAVE HI AND LOW RELAYS

I will normally remove rad cap when cool. Start engine, set heater in car to heat & turn on blower, if you use defrost setting, the rad fan &/or AC fan will come on, and you don't want that. Then while running with cap off, make sure coolant in rad is an inch or 2 from top of rad, and let it run. When engine gets to normal operating temperature on the gauge, you'll start to see more flow in radiator, and rad fan should come on shortly after, to cool the incoming hot liquid in the rad, that tells you the thermostat opened as it should, and the process starts again, engine coolant gets to temp, thermostat opens, hot goes to top of rad for cooling, and cooler liquid goes out the bottom to engine, etc etc. If your heater is not on while doing this, the coolant doesn't get to heater core in most cases, thus creates an airlock, or will cause level in rad to go down when it is turned on, and thus reduces amount of coolant in rad, plus airlocks in the entire system. So, let it run to the point that the rad fan comes on & off on it's own, about 3 times, while you watch the gauge, to make sure it doesn't overheat, if it does, shut it off and let it cool down & try again. if all appears good, top rad up if needed to an inch or so from top, put your cap on properly, add coolant to proper level in return bottle & try it and see what happens. Remember though, I am assuming thermostat was put in correctly, rad in good shape, fan is working properly as well as water pump doing it's job. If this method doesn't work, get back to me with results.