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Overheating over 60

 
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Just Try It1 Just Try It1
Moderator | Posts: 2796 | Joined: 08/14
Posted: 06/27/18
05:15 AM

i would want to perform a few quick tests..

with a cold motor.. some saran wrap.. remove the radiator cap... place a piece of saran wrap over the filler neck.. push a depression in the plastic film.  
seal it in place with a rubber band.  you may need to block or pinch shut the overflow tube..  give the upper radiator hose a squeeze to verify that the depression pops up and then goes back down when you release..

start the engine for 15 seconds..  and shut off.. the depression in the plastic film should NOT inflate within those 15 seconds of a cold start..

if it does inflate .. you may have a blown or the beginning of a blown head gasket..

your description of at low speeds the temp creeping up is a combustion or compression gas leak into the cooling system..

i am taking you put a stock temp thermostat in...  and that the radiator fans are both working properly..

you could have clogged the radiator with the stop leak.. you could have clogged the heater core and that could block the bypass circuit..  

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