Just installed my replacement mishimito radiator. Drove up 3 mile hill and yelp gauge is hot. I waited a few and drive down and gauge quickly went to 1/2 on the gauge, but it seems very temlermental. Do I need to idle the car fir a while with the heater or a/c on? Why would it be doing this.

 

interested to see the answer to this because ive had a weird overheating problem since i installed my mishimoto to, and have been trying to chase the problem for a little bit and finnaly thought it was my head gasket but now that your having the same prob it might not be,

 

Hi , Did you burp the coolant system? There might be some air bubbles in the system.

 

Maybe a stupid question but you did bleed the air out of the system after the install right? I usually fill mine with a rad-kit plus just to make sure.

 

slow typing FML!

 

^^^ Thats a good one ^^^

 

What's the best way to get air out of the system?

 

PM'd ya

 

Just crack one of the coolant lines going from the radiator to the engine on top.Let air seep out till coolant comes out then tighten.

 

idk about the OP but i burped mine, maybe thats why his is overheating and maybe mine is my headgasket lol

 

installed mines a few months ago and been working perfectly fine.

 

I had the same issue on my DSM after replacing the radiator. I open the thermstat housing cap , fill with coolant , start the car and you will see the bubbles coming up.
I usually wait till the thermostat opens and then I close the cap.

Thats pretty much it . I try to do it couple of times to get rid of all the air bubbles.

 

Why not get the burping system with the radiator cap with overflow resevoir the spill free funnel.

 

i have had mine for 2 years lol never seen a issue

 

After you install new radiator top off the radiator with whatever coolant you are using. fill the radiator, close the cap, then fill the overflow to proper level. turn vehicle on, set to def heat at max. rev engine to about 1800-2000 rpm for a few minutes. when the engine gets warm rev it a few more times and hold it until the thermostat opens, you should have heat coming in. you can shut it off now. check overflow coolant level, go for a drive down the highway and back a few miles, come back home check coolant levels. turn your heater on, it should blow hot right away if not you may still have a bubble in the system. This is pretty much how Mercedes Benz trained us to bleed the coolant. its worked on every car I have owned.