The radiator could "appear clear" and still be clogged. You don't state the mileage on your '67 but time is often the enemy. You also don't state the conditions when it overheats... Idling in traffic, climbing hills, warm days, all the time, etc. (By the way, all '67 Imperials are 440s with identical cooling systems, unless you have a super-rare non-A/C car.) First I'd pressure-test the radiator cap (or just replace it with the correct poundage cap). Maintaining the pressure is critical to maintaining the proper temperature. Then check both hoses, and make sure the lower hose has the spring inside. Then I'd have the radiator pressure-tested. Should re-coring the radiator might be called for, it's money well spent (if you have a good radiator shop, or your mechanic does). While they're at it, you should flush the block and make sure everything is circulating. And what the heck, throw on a new (rebuilt) water pump for another $35. Just occurred to me that I didn't ask what the evidence of overheating is. Is it boiling over or just showing up high on the gauge? Don't necessarily trust an old gauge. You can replace the sender on top of the engine fairly easily, and they're readily available from NAPA or even your dealer. One aside: If you're only running hot up hills and hear pinging, first switch your spark plugs from Champions to Autolite #85 plugs (assuming you're running on Champions). The pinging can cause the car to run hot under load, and many of us find that Autolites ping (pre-ignite or detonate) more easily. Good luck and let us know what you find! -- Chris in LA 67 Crown 78 NYB Salon On 7/12/05 10:22 AM, ADMBLK@xxxxxxx at ADMBLK@xxxxxxx wrote: > My 67 crown has been over heating. I changed the thermosat, radiator appears > clear, any thoughts what else could be causing the problem? > > Thanks.. ----------------- http://www.imperialclub.com ----------------- This message was sent to you by the Imperial Mailing List. Please reply to mailing-list@xxxxxxxxxxxxxxxx and your response will be shared with everyone. Private messages (and attachments) for the Administrators should be sent to webmaster@xxxxxxxxxxxxxxxx To UN-SUBSCRIBE, go to http://imperialclub.com/unsubscribe.htm