Power V8

Dont post much on forums as I can usually do a search and find everything I need, but have not found this one yet.

Background - Auto 2005 C6- super stock 89K miles - owned for 2 month. Runs cool driving around, but at idle temp will go to 226. Runs 195 to 205 at highway
Never race with it or drive hard

The wather Temp is between 20c to 28c

fan operate at correct temps 220f When A/c off
Enging oil temp reach max 230f
Transmisstion field reach 220f
Good air flow with fans on.
No visiable leaks - been parking on card board.
Have not had to top off overflow tank

Today moring I thought I would see if it was air in the system. Took sergent tank cap I noticed that the cap is not holding the prusser
So I had replace it with new one .

Now I notice another scary thing the radiator both upper & lower pipe are very soft like its empty but the sergent tank is half-full with coolent water

Also even if the temp is 220f I can open the cap and still no pressure
In normal cases the water should blow out???


With the engine off still the pipe are soft

I feel that the engine is getting overheat

don't know what is going on but for sure some thing is not right about getting a soft pipe ....!!?

Any suggestions

CMY SIX

put water in it?

el es tu

yep fill it with distilled water, run it for a while, then top if off with more water if necessary.

if it keeps draining down then start the search for a coolant leak...

Power V8

My level water is on its max more it will be over
I mean if you have fill up the tank till the maximum
It will make it worse...


Thanx for ur post ....

Power V8

But it's already full to the allowed factory level !!

or do you mean that I have to over fill it
I think I'm getting crazy about it

VET4LES

I don't think you have a problem. Your temperatures look normal. The hoses could feel soft when it's not running. Wait and see.

Where do you live?

el es tu

dont overfill it - drive it or let it idle for a while then check the fluid level.

depending how you drive it and how long you drive it, the car seems like its normal

Power V8

I did that too,

I was keep on monitoring the water level but its always at factory max & Never get less !??

TerryL

With the overflow tank filled to the correct level, when cold, remove the rad cap and fill the rad up to the bottom of the opening and replace the cap. You can also remove the cap when cold, fire up the motor and watch down the opening and when it warms up if the thermostat is working correctly, you'll see the coolant level in the rad go down when it opens or maybe disappear altogether. When it does, top off the rad with coolant up to the bottom of the rad cap opening and replace the cap. Then you'll know for sure that the system has enough coolant in it. Soft hoses when warm means there is no pressure in the system and that something is wrong.

Power V8

This now my problem the car is running and the temp reach 210 Even if I drive in rush-hour and temp will be 225f still pipe is soft ?!


Believe it or not I can open the cap and on the same time no Pressure or water came out the only thing I can feel is the super hot coolant at 230 or more

I'm living in Middle East specific in Bahrain

TerryL

When its hot and you can remove the rad cap (soft hoses) mean no pressure which should indicate that your thermostat is stuck closed and is not exchanging hot coolant from the motor with the cooler coolant in the radiator.

Power V8

In case of a stuck thermostat the water will blow out from the sergent tank or at least the there will be a pressure on the pipe

Correct me if I'm wrong

Power V8

But just in case I will replace the thermostat
Thanx TerryL

Gearhead Jim

When the coolant is cold, the level in your overflow tank should be lower than when it's hot.

There is a hard-to-see "Full Cold" mark on the front of the plastic tank.

Check that the coolant is at or very slightly above that mark when cold in the morning. Then drive the car long enough to get the coolant temp above 190'F for about 5 minutes or longer. Stop and recheck the level. If it has increased about 25mm or a little more, then everything is probably connected properly. If the level doesn't change, something is wrong. These checks must be done on a level surface, best is to do both checks when parked in the same location.

Power V8

Sorry for the late post, I've been working on project which take most of my time.

Now I have replace the termostat with new one and just to make sure from the old termo I have test it on hot water and guess what it was working perfectly

so I know the problem is not from the termostat

I will do the process u post and will update you

weathermaker

If it does not build up pressure in the system, then there is a leak. It is usually the cap. You said you have replaced the cap. Check the cap with a pressure check. It may not work or it is the wrong cap. It all that checks out then the leak is elsewhere. If you are not loosing coolant it may be around the tank above the water line. Water pumps have been known to leak but usually can be seen dripping.

Power V8

Again the cab has been replace with new one & now I can notice the pressure on the pipe

But still the engine temp reach 220f
Also tran oil reach 220f and engine oil temp reach 230f
Is it normal Or should I fix an after market tran cooler....

Steve_R

There is nothing wrong if the system has pressure and the coolant temp doesn't go over 220F.

Power V8

Ok this is great but is the transmission temp reaching 220f normal
And it's all the time like this which make me scare of future trans slipping

wayback

Corvettes are designed to run hotter than most cars. Nothing to worry about. Should be around 190-200 at freewy speeds and 220 in traffic is normal.

On my C4 the fan does not come on till water reaches 240. Factory setting.