i hope you put the thermostat back in.

you may have a block issue from the overheating. you said the heads were pressure checked for cracks??? if not, get it done.

otherwise, it sounds like you covered all the bases.

Roy

Answered by ASEMaster6371 (expert)
24,825 answers provided

Since there was no one locally to test the heads the shop reinstalled them. The thermostat is back in. The confusing issue is that I can drive this car for at least two hours below sixty and the gage stays normal. I blast up to 70 and the engine haets up. As soon as I pull over the temp drops to normal within 30 sec.

Response from Chuck Q
1 question asked

it sounds like a circulation issue either with the water pump or the radiator. was there much gunk in the system??

Roy

Answered by ASEMaster6371 (expert)
24,825 answers provided

Radiator was replaced. I think I have it narrowed down to the lower rad hose. Even though it was only 6-7" of free space I think the hose was sucking closed at higher RPM. When I slowed down the hose would open back up. The radiator shop it appears did not change the hoses. Rep;aced the coolant put in a new hose, lowered the thermostat to 180 deg. and after 45 miles in 85 deg heat the temp is staying normal. Thanks for the help. Sometimes you just think you are going nuts going nuts when the regular things do no not work

Response from Chuck Q
1 question asked

did you change the rad cap??

Roy

Answered by ASEMaster6371 (expert)
24,825 answers provided

Sorry I was out of town for a week. Do you think that will help. It has a plastic pressurize overfloe tank

Response from Chuck Q
1 question asked

change the rad cap as it may be bad or full of crap.

Roy

Answered by ASEMaster6371 (expert)
24,825 answers provided