I'm wondering what "had it filled" means. Could be you have just a bad cap and people have been adding to the expansion jug and not even checking the radiator.(Cap seal n/g during "contraction")
OR - If it was drained and filled there's a good chance no one took the time/effort and/or let it go through a warm-up cycle enough to get all the air "bled" out.
OR - Does "had it filled" mean it was low and not properly pressure checked and/or pressure checked and "no leaks found" @ that time?
Either way getting it hot most likely compromised the t-stat (even if it wasn't the problem) and it should be replaced. It's relatively easy to access if it's a 4.0 OHV (overhead valve). If it's a 4.0 SOHC (overhead cam) I wouldn't - the housing's plastic, harder to access and tend to leak if you're not careful. And a thin layer of silicone in the right place. Drill a tiny "bleed hole" in it if it doesn't have one.
Friday, February 13th, 2009 AT 10:02 PM