head gasket or coolant tank?

[mr99svtcobra]

1999 cobra vortech v1 supercharged and intercooled with 11lbs of boost ...car does not overheat but sometimes when i drive i can see coolant near the expantion tank's cap and it boils when you open the cap....i replaced the cap with a ford oem and still no help it still does it. I also did a block test and according to the test i dont have any headgasket issues. my oil is perfect, my spark plugs are fine, there is no sluge on my oil cap, and i do not see smoke out of my exhaust.

ideas guys car has over heated 3 times before but for different reasons could that have warped the coolant tank or damage the radiator? :shrug: i already burped the system several times.

thank you for all the help svtp

 

[2000 gt]

Too much coolant in the reservoir. Happened.to me. A while ago. It should stop after u suck some coolant out. The level shouldnt be at the tip top when the car is cold. When the car gets hot coolant needa a place to go. and expand

 

[RX1Cobra]

I bet the tank is warped. Take a file and level it out.

 

[01yellercobra]

My understanding is once an engine over heats the reservoir will warp and never seal correctly again. You'll have to replace it. Personally I would replace it with a metal tank. I have a Canton that uses a standard radiator cap. You might also want to consider replacing the thermostat if you haven't done that yet.

 

[mr99svtcobra]

Thanks for the input guys yea I forgot to mention I replaced the stat

Also my coolant light is on all the time some times it goes away then it comes back .....what's a good way to remove coolant without getting air in the system

 

[po-po 5.0]

Thanks for the input guys yea I forgot to mention I replaced the stat

Also my coolant light is on all the time some times it goes away then it comes back .....what's a good way to remove coolant without getting air in the system

Remove coolant from the tank. It's a pressurized part of the system.

 

[mr99svtcobra]

I just did a compression test the results are 190 180 180 180 178 179 180 180

 

[po-po 5.0]

I just did a compression test the results are 190 180 180 180 178 179 180 180

Looks good. Pressure test the cooling system to be sure, but I'd be investigating the oil cooler.

 

[mysticoupe]

I've had a similar problem, it was a bad coolant tank.

 

[mr99svtcobra]

Problem fixed guys when I got the new cap I didn't bleed the system I burped the system with the new cap and it's been 3 days soo far soo good :beer: