I dont think you need to open the cap, just elevate the front and warm it up. unless you have a lot of air it will just rise to the top when it cools down. Make sure your overflow tank has coolant in it so the system doesnt such air back in while it cools.

 

Well that certainly makes it easier! I was all worried about losing a qt or two of coolant. I'm still confused as to why they housed the radiator cap in the upper hose instead of on top of the radiator.

 

A question did/have you done a hard core system flushing/cleaning of the cooling system?

If not that may be your problem or part of the problem

I’m thinking you may have a partially clogged heater rad.

Have you back flushed the heater rad out?

 

I have not flushed the system. I'm kinda going day to day and can't buy 2 gals of coolant right now, but would like to do it before winter.

 

True coolant used to be cheap not now it’s kind of pricy especially for what it is they rip you off now days.

You can still back flush the thing out.

If I remember correctly in the old days we used a box of baking soda to flush out the cooling system do a google on it.

A link I found http://www.bobistheoilguy.com/forums...&Number=616356

Coolant is cheaper in the concentrated form they still sell it that way get that then mix with water just tap water is fine.

The premixed stuff 50/50 is pricy

 

only thing I would use baking soda for is cleaning battery posts never in a rad.

 

I used it for years so did my Dad never had any problems with rotting out rads or any other problem.

We always did a double system flush out but that’s what I do now with the store flush they sell.

And the dirty water that came out was amazing it did the job better than the $5 stuff

Old school but works and very cheap. $1

 

Read lots of idiots but this works

http://www.thirdgen.org/techboard/co...sh-baking.html