I am not sure what the problem is. I replaced my OEM radiator with a dual core all aluminum radiator. I put new silicone hoses, dual slim fans that run the minute the car turns on and I replaced the thermostat. My overheating is completely random. I could be driving or even idling and it may or may not overheat. I don't know what it could be. The fluid levels are perfect.

 

bleed the system.

 

bleed the system make sure you don't have a leak and check that the thermostat is working right.

 

Bleed the system as in doing a flush? If I had a leak wouldn't my coolant level be going down?

 

Na you have to follow a procedure to purge the air out of the coolant system. It is real easy and may not seem to be a big deal, but it can definitely be the cause of overheating. It could be a few other things too but thats the easiest and cheapest to fix.Do you have heat from your vents?

 

So what I do is turn the heat to full blast at the hottest setting, then take the rad cap off and make sure its filled up. Then i start the car, and let it idle for a while, occasionally squeezing the top rad hose to help expell the air. Once its warmed up and the thermostat opens i shut it down and refill coolant a couple minutes later. I make sure all the air is out by squeezing the hose until no more bubbles come out. Then i reinstall the cap and go for a drive. Turning the heat on and idling with no cap on is crucial. The filler neck is the highest point of the coolant system, that is why there is no need for a bleeder screw.

A few other things it can be are failing water pump, bad coolant sensor, or even a blown head gasket. The last item will usually result in no heat as well.

 

Ok I will check that out. I do get heat when I turn on the heater. So I will start with replacing the sensor because that's cheap and I will make sure to bleed the system from any air pockets I find. I suppose if that all falls then I will do the water pump and pray it isn't a head gasket. Thank you for the help.

 

Before replacing any more parts, bleed the air out of your coolant system as others have mentioned. Bleeding the air can take as long as 20 minutes so dont cut time short thinking you're finished. Do a search on the site for instructions on how to perform the procedure.

 

 

Trust me,.....listen to what they are telling you.....bleed the system. Everything was fine before so you probably didn't magically blow a head gasket or a sensor failed....but you probably did get air in the system, especially since you didn't bleed it. I just did this 2 days ago and my problems are solved. The only different steps I've seen to the process are jacking up the front of the car which helps more air escape out the radiator filler neck. Take at least 10-15 mins to do it. It will fix your issue.