Turning objects with .C1 weld - CFrame.Angles?

I am currently attempting to make a car that when the .Steer values of a vehicle seat are 0,1, or -1, the wheels turn. However, the wheels are not turning, and I am not sure why.

Below are the two scripts I am using to one, generate the weld, and two, control them.

Weld:

local prev
local parts = script.Parent:GetChildren()
for i = 1,#parts do
    if ((parts[i].className == "Part") or (parts[i].className == "Seat") or (parts[i].className == "WedgePart") or (parts[i].className == "Seat") or (parts[i].className == "TrussPart") or (parts[i].className == "VehicleSeat") or (parts[i].className == "SkateboardPlatform")) then
        if (prev ~= nil) then
            if (parts[i].Name == "FLWheel") or (parts[i].Name == "FRWheel") then
                local weld = Instance.new("Weld")
                weld.Part0 = script.Parent.Engine
                weld.Part1 = parts[i]
                weld.C0 = script.Parent.Engine.CFrame:inverse()
                weld.C1 = parts[i].CFrame:inverse()
                weld.Parent = parts[i]
                parts[i].Anchored = false
                weld.Name = "WheelWeld"

            else
                local weld = Instance.new("Weld")
                weld.Part0 = prev
                weld.Part1 = parts[i]
                weld.C0 = prev.CFrame:inverse()
                weld.C1 = parts[i].CFrame:inverse()
                weld.Parent = prev
                parts[i].Anchored = false

            end 

        end
        if (parts[i].Name == "FLWheel") or (parts[i].Name == "FRWheel") then
            prev = prev
        else 
            prev = parts[i] 
        end 
    end
end
wait(3)

Main Driving Script:

--Editting properties:
local TurnSpeed = nil
local MaximumSpeed = nil
local SetSpeed = nil
local Braking = nil

local Car = script.Parent.Parent
local Seat = script.Parent
local Driving = false


script.Parent.ChildAdded:connect(function(child)
    if child.Name == "SeatWeld" and child:IsA("Weld") then
        Driving = true
        local character = child.Part1.Parent
        local player = game.Players:GetPlayerFromCharacter(character)
        Car.CarOwner.Value = player.Name

    end
end) 

script.Parent.ChildRemoved:connect(function(child)
    if child.Name == "SeatWeld" then
        Driving = false
    end
end) 

MainDrive = coroutine.create(function()
end)

local FRWeld = Car.FRWheel:WaitForChild("WheelWeld")
local FLWeld = Car.FLWheel:WaitForChild("WheelWeld")
local welds = {FLWeld.C1,FRWeld.C1}


LeftRightWheel = coroutine.create(function()
    while wait() do 
        if Driving == true then

            if Seat.Steer == -1 then
                welds[1] = welds[1] * CFrame.Angles(0,90,0)
                welds[2] = welds[2] * CFrame.Angles(0,-90,0)
            elseif Seat.Steer == 1 then
                welds[1] = welds[1] * CFrame.Angles(0,-90,0)
                welds[2] = welds[2] * CFrame.Angles(0,90,0)
            elseif Seat.Steer == 0 then 
                welds[1] = welds[1] * CFrame.Angles(0,0,0)
                welds[2] = welds[2] * CFrame.Angles(0,0,0)
            end
        end
    end
end)    
coroutine.resume(LeftRightWheel)

All of the variables are correctly defined, and the instance "WheelWeld" has a part0 of the center part in the car, "Engine" and a Part1 of the wheel. The if statement for the main drive script is passing, I checked with "print()". I can't tell why it isn't turning....

Am I trying to rotate them incorrectly?