Which Radiator Cap
Senior User
Joined: Apr 2007
Posts: 315
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From: Conway, AR
The parts catalog lists a 7 and a 13 pound cap. If you're unsure of the condition of your heater core and radiator, might want to stick with the 7 pound cap. 13 will give you a higher boiling point, but that won't help you if your solder joints on an old radiator are seeping.
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Elder User
Joined: Jan 2007
Posts: 620
Likes: 0
From: Langley, BC, Canada
alright the cap on the truck now is a 7 so ill just stick with a 7... if it aint broke dont fix it right.
whats the difference between the 7 and 13 cap? did the trucks come with either from the factory?
whats the difference between the 7 and 13 cap? did the trucks come with either from the factory?
Senior User
Joined: Apr 2007
Posts: 315
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From: Conway, AR
They were probably 12-13 factory. but if it's got a 7, I'd keep it unless doing a bunch of upgrading. 13 gives a slightly higher boiling point, but more stress on an old cooling system. When I first got my truck, before doing anything to it, I put a new cap on, and Like a ding bat I stuck a 13 on it and promptly popped the top seam out of my old tired radiator. I soldered it up and stuck a 7 back on it till I got around to fixing everything up. Now with the custom rad and the Evans coolant, no presure cap needed.
Moderator
Joined: Jan 2001
Posts: 56,992
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From: Virginia
The main difference you will notice running a lower lb cap is the coolant level in the recovery tank will move more between the engine being hot and cold. If you are not running a recovery tank, you will need to run more air space in the top of the radiator with a lower lb cap.
