- Joined
- Feb 11, 2021
- Messages
- 2,835
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- 2,904
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- 113
- Location
- Seattle, WA
- Vehicle Year
- 1991
- Make / Model
- Ranger XLT 2WD
- Engine Type
- 3.0 V6
- Transmission
- Automatic
- 2WD / 4WD
- 2WD
- My credo
- Keep your mind like an umbrella, it only works if its open... Continually learning.
I picked up a new radiator cap and noticed... The new one is a RS-90 and the old one is a RS-77. The difference is the RS-90 is 16 psi and the RS-77 is 13 psi.
So what is the purpose of having different PSI ratings on the cap? I do know that the higher the PSI the hotter the temp takes the water to boil. But wouldn't that do more harm to the engine?
The biggest question is, which one is the correct rad cap for a 91 3.0l v6? Everything I find says "fits your vehicle".
So what is the purpose of having different PSI ratings on the cap? I do know that the higher the PSI the hotter the temp takes the water to boil. But wouldn't that do more harm to the engine?
The biggest question is, which one is the correct rad cap for a 91 3.0l v6? Everything I find says "fits your vehicle".