Help my radiator cap burps a small spurt of coolant but it do not overheat or get hot. It run the temp gauge just above the 210 than will go down just below the 210 degree while running. I just did a head gasket job new t stat water pump and radiator also new cap. She runs strong but I want to get this annoying problem fixed can you pleas give me a hand on this one

 

Do you mean it is bypassing coolant into the reservoir or leaking out at the cap? No cap should leak, especially if it is new. Is it an 18 psi cap?

 

Hi,

Whether the cap is new or used, I would verify that it releases at 18psi. Most auto parts shops have a tester they can lend you. If the cap tests out and the temperatures are normal, I would be worried about combustion pressure entering the cooling system. I'll keep my fingers crossed for you.

 

Hey thanks for your post . Yes it would burp a small amount of coolant from under the rad cap but it has not done it in about a week. I think I had to much fluid and some air in the system we will see. Burp meaning spray Small amount of coolant from under the cap like a quick spray out

 

The cap should seal tight against the fill neck on the radiator, and should not visibly "burp" anything. The cooling system will not work correctly if the cap leaks.

The cap relieves pressure in the radiator (pressure builds as the coolant heats up and expands) by venting it to the reservoir. When the engine shuts off and the system cools down, the coolant contracts and the resulting vacuum pulls the coolant out of the reservoir, through the vacuum relief passage in the cap, to keep the radiatory full.

There is no such thing as "too much coolant". The system must be kept full to the fill neck, with no air at all, relying on the cap to relieve the pressure, and keep air from entering the system.