I had a similar problem once on a 73 Plymouth I had. As the car reached operarting temperature, I felt the top and bottom of the radiator. The top was a lot cooler than the bottom, and indeed the radiator had a clog in it. Before you get too drastic, have you checked the radiator cap? Over time the gasket begins to give way, and it doesn't hold as much pressure causing the temperature to rise. (Remember the relationship: Pressure X Volume = Temperature) The heater valve is another good culprit. Chris Middlebrook --- On Tue 06/15, < imperial59@xxxxxxxxxxxxxxx > wrote: From: [mailto: imperial59@xxxxxxxxxxxxxxx] To: mailing-list@xxxxxxxxxxxxxxxx Date: Tue, 15 Jun 2004 16:48:25 -0400 Subject: Re: IML: '68 running warm <--my '67, too! > My own thoughts tend towards something wrong with the<br>> engine itself, ie >timing wrong, plugs, mixture, etc,<br>> rather than a defect in the cooling >system. Am I on<br>> the right track here?<br><br>I would lean toward a >clogged radiator. When they start to clog up it does ok at idle or slow speed >but can't dissipate the heat generated by hiway travel. <br><br> >Steve B.<br><br><br><br>----------------- http://www.imperialclub.com >-----------------<br>This message was sent to you by the Imperial Mailing >List. Please <br>reply to mailing-list@xxxxxxxxxxxxxxxx and your response will >be <br>shared with everyone. Private messages (and attachments) for >the<br>Administrators should be sent to webmaster@xxxxxxxxxxxxxxxx<br>To >UN-SUBSCRIBE, go to http://imperialclub.com/unsubscribe.htm<br><br> _______________________________________________ Join Excite! - http://www.excite.com The most personalized portal on the Web!