Have you lost any coolant? is there any signs of white smoke? i would go get a head check done, this is a simple and cheap chemical test for exhaust gasses in the cooling system, if so you will have a head problem, also a diagnostic scan will be a good idea as well, start here.

mark (mhpautos)

Answered by mhpautos (expert)
26,869 answers provided

yes coolant loss but see no leaks no white smoke at all. Does Dura-seal work? Here is the site... I am on limited funds and they said after compression check that it could be cracked head gasket, now saying maybe cracked block. It does not overheat all with normal every day driving only win I am going above a certain speed 70mph for more than 10-15 mins.. Oil is clean too. The compression test made my coolant bubble up...
http://www.seal-a-head.com/page20.html

Response from Mel
2 questions asked

These fixes in a can really don't work, they may slow it down for a short while but it is no long term solution.

Mark (mhpautos)

Answered by mhpautos (expert)
26,869 answers provided