It turned out to be very very low on antilfreeze. I added about a gallon and it appears to be fine. The radiator is less than 3 years old, and I had it flushed less than a year ago. Where did the antifreeze go? The oil isn't cloudy and I haven't noticed any leaking anwhere.
Thanks again for the replies!
Rob Armstrong, Charlotte, NC
Mountain Island Lake
2004 VW Passat GLS TDI-50k
2006 Honda Odyssey EX-L 7k
FOR SALE 1991 300TE 228k
2003 Subaru Outback 57k Silver/Black-SOLD
2005 C230K 18k Pewter/Grey-SOLD
1997 E420 108k Black/Grey-SOLD
1986 560sl 200k Black/Palimino-SOLD
1985 300sd 340k-SOLD
1979 240d 170k-SOLD
2000 Volvo V70XC-POS couldn't sell fast enough