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1995 SEDAN DEVILLE-4.9 & 1978 SEDAN DEVILLE-425
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1,673 Posts
Discussion Starter #1
Heard some gurgling under the hood when engine was off today---hot day,seems to have
been radiator purging excess coolant into overflow tank.
Turned engine on,let it run a while and noticed "top" radiator hose that goes to thermostat
deflating to flat.
Turned engine off and it inflated back to normal size within 2 minutes.
What causes that and is that normal?
Thanks
 

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1995 SEDAN DEVILLE-4.9 & 1978 SEDAN DEVILLE-425
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1,673 Posts
Discussion Starter #2
Checked cooled down engine after an hour--both upper & lower rad hoses were collapsed.
Got radiator cap off--it was like vacuum sealed--took some force to remove it.
Had a spare new rad cap in trunk,put it on--ran engine till real hot for a half hour---all is good so far.
Did a quick google search while letting engine cool and most said it`s a bad rad cap and/or clogged line from
top of rad to overflow tank. I checked the line and it`s ok.
 

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1990 Brougham, 1990 Brougham d'elgance 1979 Coupe
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1,196 Posts
My 90 has some seepage, I thought is was the cap, put a new one on but it still seeps. Im going try sodering around the filler neck and see what happens.

Your car must be loving all the attention this year.
 

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Registered
1995 SEDAN DEVILLE-4.9 & 1978 SEDAN DEVILLE-425
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1,673 Posts
Discussion Starter #4
My 90 has some seepage, I thought is was the cap, put a new one on but it still seeps. Im going try sodering around the filler neck and see what happens.

Your car must be loving all the attention this year.
It`s absolutely loving all the attention this year!
 

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Registered
1995 SEDAN DEVILLE-4.9 & 1978 SEDAN DEVILLE-425
Joined
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1,673 Posts
Discussion Starter #5
My 90 has some seepage, I thought is was the cap, put a new one on but it still seeps. Im going try sodering around the filler neck and see what happens.

Your car must be loving all the attention this year.
Used to be it was easy choosing a replacement radiator cap back in the day.
Now it`s not so easy. E-bay has so many different styles--some with the flared tabs for easier turning etc.
Only mention it since I have`nt been able to find one like the original--just circular with no finger tabs--AC/DELCO.
The new spare I have has the flared out tabs for easier turning but it does`nt seem to go on as "tight" as
the original. Been checking it and it does "not' seep and hoses have "not" collapsed since using it---maybe that`s the new design these days.

First I`ve heard of soldering around the filler cap--hope it works for you.
 
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