How do I convert my car seat to a boster seat

Make sure the torque converter is for the same transmission, and all you have to do is turn the converter left and right while pushing it in and it should pop in connectiong the oil pump.

If you want to buy a car seat for our baby than best option is convertible car seat and there are many car seats available in the market so choose the best one after reading this article I want to recommend this Graco 4ever all in one convertible car seat to everyone http://mrbabygear.com/

Watch these 2 instructional videos on how to convert the Evenflo Symphony car seat here:
http://www.evenflo.com/support.aspx?id=452
http://www.evenflo.com/support.aspx?id=460

chek a vacuum hose or the boster valve , maybe brake fluid inside the brake boster

Remove the large bar holding the bottom plate. One side will have a plastic retainer which you just move to the side and pull the barr all the way out from that side. There is a rear leg that you can pull down and back which will make the seat sit more upright. Remove the strap (it is one solid strap) and be sure to save all the parts if you plan on giving it to a needy family when your child outgrows it. The center clip is easy to remove, turn the seat upside down and find the metal retainer and pull it up, turn 90 degrees and feed it through the hole and pull on the other side. Now you should have a strap/clip free seat that will be a "seatbelt positioning booster seat".

I'm sorry, I don't know if or where you can get the instructions. The vast majority of carseats expire after 6 years, though. I think 10 years is the max. and there are few of those on the market. If at all possible, I would recycle the seat you have and pick up a new booster seat.

http://www.coscojuvenile.com/usa/eng/DJGFiles/ProductDocuments/43583340A.pdf

this link will take you to the manual

You can visit this link to download PDF instructions. You need the manufacture date and it should be printed somewhere on the car seat in mm/dd/year format. Hope that helps :)
http://www.coscojuvenile.com/usa/eng/Instructions

u need pliers! there is a long pin in the bottom goes from left to right. pull it out and bottom detaches

Manual is available at the manufacturer's website

http://www.coscojuvenile.com/instructions/