You can check the hoses, but 95% chance is the heater core itself is leaking. And to replace that you have to remove the WHOLE dash from the pickup, or at least lay it back on the front seats. These pickups are a huge PITA to replace a heater core. If you are very mechanically inclined and confident in your abilities and have a good step by step manual you can try it yourself. If you have a doubt dont even try, it will only cost you more to have someone do it if you have taken some of it half-assed apart not knowing what actually needs to be done and then take it in. Thats theoretical tho, I have no idea what your abilities are. Someone just attempted that about a month ago then took it to a dealer for my dad to do it and them complained when it cost a few hundred more to fix his errors.
Last edited by jayson_waltz; 09-13-2011 at 01:43 PM.