View Full Version : radiator cap # ?

04-04-14, 10:57 AM
Hey Everyone,
I found that part of my N* overheat problem is seepage from the radiator cap. Its fairly new
about 7 months/7k but it has been subjected to a couple of overheats and also has the vent
lever. I am going to buy a new one tonight without the vent and I was wondering if I should go
with a 17# or stick to a 16. I'm guessing a 16 but I would like to hear the thoughts on this..
thanks Ed

04-04-14, 11:05 AM
Either will work. Some had 16 and others had 18. That's simply the pressure at which it will vent (safety feature). Normal operating pressure is much lower.

04-04-14, 04:22 PM
Thanks Ranger, So you don't think the other 2 # will be too much for the system? I want the cap to keep the coolant in but not at the expense of blowing out a heater core or something. Ed

04-04-14, 08:49 PM
No, I'm sure the system was pressure tested at well over the relief pressure. I'd go with whatever factory spec's are. If it blows and overflows, another 2 lbs is not going to help you. You will still have the same problem and it will need to be addressed.