overheating only on the freeway under no boost
 

here is what it does. when i am driving at about 65-70 mph or faster for a while my temp gauge will rise even when i am not in boost. if i open the heater core the temp will slowly drop to normal. my car does not overheat no matter how hard i drive when i am not on the freeway. i have a turbo gsr in a vx hatch. i have the spoon temp switch and thermostat. do i just need a aftermarket radiator or could i have a problem elsewhere??

Re: overheating only on the freeway under no boost
 

blew a HG.

Re: overheating only on the freeway under no boost
 

i have no mixing of fluids and it does not overheat when i am on it only at freeway speeds

Re: overheating only on the freeway under no boost
 

does it start overheating if you let it sit idle in your driveway?

still think its the headgasket.

Re: overheating only on the freeway under no boost
 

no the only time it will overheat is on the freeway with no boost at about 65-70 mph.

Re: overheating only on the freeway under no boost
 

that's odd.

a completely stock honda cooling system should have zero problem cooling a basic hmt turbo setup. I'd suggest starting small and easy. Replace the t-stat, and rad cap. If the problem persists, then look back to your headgasket.

Re: overheating only on the freeway under no boost
 

take ur t stat out n put ur fan on constant =x i had that issue with my teg on freeways, put the bitch on constant and it never over heated again. everyone kept tellin me it was the hg as well. i to had no mixing fluids

Re: overheating only on the freeway under no boost
 

Niether did I, no smoke, no nothing, I denied everyone saying it was th HG until one day I replaced it and all was well.

Re: overheating only on the freeway under no boost
 

do a compression test, if its not your hg do what turboda6 said and hook up your radiator fan to switch, or if your cheap hook it up to your radio fuse :P one side of my radiator is completly toast (bent fins) from my last turbo setup, it used to overheat untill i started using the radiator fan constantly. It used to go up to 230 degrees now it stays around 165-175 with an OEM therostat! They work miracles :D

Re: overheating only on the freeway under no boost
 

id get a bigger rad...i had the same problem after i swapped in my b16 with a turbo. Only got hot at high rpms on the highway, and i know for sure that the hg was good (because i did change it). My solution was to just live with it getting a little hot and not drive so fast lol.

Re: overheating only on the freeway under no boost
 

Does your upper/lower radiator hoses get rock hard from just normal driving? If they are, and you are sure you have gotten ALL the air out of your cooling system, there is a good chance the HG is just slighty pushing.
Also, if you idle your car for a long time with the radiator cap off, do you get air bubbles every few seconds that wont go away?

Thats why I like metal HG's, you can have a blown/leaky gasket and still drive it hahah

Re: overheating only on the freeway under no boost
 

you have the single core half radiator?

Re: overheating only on the freeway under no boost
 

get a better radiator. it is not up to the task.

you can get a cheap ass alum core plastic end tank rad off ebay for 80 bucks

Re: overheating only on the freeway under no boost
 

i got this one it is way sweet
no probs at all.

http://cgi.ebay.com/ebaymotors/HONDA...QQcmdZViewItem

Re: overheating only on the freeway under no boost
 

I would double check all of the things you can easily.

Is the fan comming on?
Is the thermostat opening properly?
Is there air in the system?
Bad compression test?

All of these are free or $5 answers.

I picked up a cheap $50 shipped radiator from eBay. Old one was just falling apart.

Re: overheating only on the freeway under no boost
 

my blackcar did this for ahwile turned out that after 10 years the factory radiator was pluged. try this go drive the car after its fully warmed up pull over and check for cool spots on the radiator if theres any coolant is not flowing there.

Beau

Re: overheating only on the freeway under no boost
 

That's exactly what happened to my old radiator. There was actual sludge in the radiator. The car kept getting hot on the freeway. I put my fan on 100%, that helped a bit, but not much. Did comp test, just fine. I looked in the bottom of my coolant res, and there was this sludge in there. I cleaned everything out, got a new radiator and problem solved.

Re: overheating only on the freeway under no boost
 

How do you find a cool spot?

Re: overheating only on the freeway under no boost
 

Put your hand over it, does it feel cooler in some spots? If it doesn't feel so hot, try touching it, if it feels quite hot. I wouldn't touch it. Come on. Common sense. ;)

Re: overheating only on the freeway under no boost
 

thermal guns work nice too..... for those with $$$