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Original Message
It could be the wrong type of cap.
By Dave Shoe - 03/16/2004 6:58:23 PM; IP 216.243.176.34
You may have one of those newfangled caps (around since the 1970s) that is designed to work with an overflow cannister. You can tell because that dime-sized valve in the center of the cap that rests in the coolant simply dangles instead of being spring-loaded closed.

I've had this problem in the past, so I thought I'd mention it. Obviously, keeping your radiator too full will cause some spitting until it levels out, but spitting after it stops suggests you aren't holding pressure properly at the cap.

The reason for the extra hotness after turning off the engine is the cooland stops flowing, and the coolant nearest the exhaust valves can boil and create steam pockets in the head if there is insufficient pressure capacity at the cap to prevent this steam.

An ancient radiator cap can also do the same, since it may have lost a seal or two to petrification.

Focus on the cap, and the spitting should disappear.

JMO,
Shoe.
This thread, so far...
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Collapse <a href=../ForumFE/reply.aspx?ID=20709&Reply=20709><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor20709" onclick="return false;">What is the expansion tank for on the old 390's?</a>&nbsp;-- <font color=#0000ff>Steve M, <i>03/16/2004</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=20709', contentMargin: 60, icon: $('anchor20709') }); </script>  What is the expansion tank for on the old 390's? -- Steve M, 03/16/2004
Collapse <a href=../ForumFE/reply.aspx?ID=20711&Reply=20709><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor20711" onclick="return false;">RE: What is the expansion tank for on the old 390's?</a>&nbsp;-- <font color=#0000ff>Gerry Proctor, <i>03/16/2004</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=20711', contentMargin: 60, icon: $('anchor20711') }); </script>  RE: What is the expansion tank for on the old 390's? -- Gerry Proctor, 03/16/2004
Collapse <a href=../ForumFE/reply.aspx?ID=20714&Reply=20709><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor20714" onclick="return false;">Could that be why my radiator spits all the time?</a>&nbsp;-- <font color=#0000ff>Steve M, <i>03/16/2004</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=20714', contentMargin: 60, icon: $('anchor20714') }); </script>  Could that be why my radiator spits all the time? -- Steve M, 03/16/2004
Collapse <b>It could be the wrong type of cap.</b>&nbsp;-- <font color=#0000ff>Dave Shoe, <i>03/16/2004</i></font>It could be the wrong type of cap. -- Dave Shoe, 03/16/2004
 RE: It could be the wrong type of cap. -- Steve M, 03/17/2004
Collapse <a href=../ForumFE/reply.aspx?ID=20715&Reply=20709><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor20715" onclick="return false;">old style motormounts used the expansion tank.</a>&nbsp;-- <font color=#0000ff>Dave Shoe, <i>03/16/2004</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=20715', contentMargin: 60, icon: $('anchor20715') }); </script>  old style motormounts used the expansion tank. -- Dave Shoe, 03/16/2004
 RE: old style motormounts used the expansion tank. -- giacamo, 03/16/2004
Collapse <a href=../ForumFE/reply.aspx?ID=20718&Reply=20709><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor20718" onclick="return false;">RE: old style motormounts used the expansion tank.</a>&nbsp;-- <font color=#0000ff>Travis Miller, <i>03/16/2004</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=20718', contentMargin: 60, icon: $('anchor20718') }); </script>  RE: old style motormounts used the expansion tank. -- Travis Miller, 03/16/2004
Collapse <a href=../ForumFE/reply.aspx?ID=20720&Reply=20709><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor20720" onclick="return false;">Thanks for the update.</a>&nbsp;-- <font color=#0000ff>Dave Shoe, <i>03/16/2004</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=20720', contentMargin: 60, icon: $('anchor20720') }); </script>  Thanks for the update. -- Dave Shoe, 03/16/2004
 RE: Thanks for the update. -- Travis Miller, 03/17/2004
 RE: What is the expansion tank for on the old 390's? -- jeff, 03/17/2004
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