Relays don't have to go in the right coloured plug, if your blower works, you have definitely got the relay in the right slot, if you want to know which it is, keep pulling relays and trying the blower until it doesn't come on, it's definitely not the orange or black (heated rear window and indicators), I'm pretty sure its the top brown relay in the green slot. Have you tried starting the engine with it on full cold? Weirdly mine stays cold for about 50% of journeys doing that, not perfect but it's a start lol. I'm at a loss with it now though but won't be looking any further into it so good luck with yours!
Left and right movement I'd check the P bush and track rod end.
Erratic idle is an odd one...I've never had a 306 idle as well as the current GTi6, despite all it's other faults. Can you tell if the throttle body has been off the manifold? If so it's likely the gasket between them was broken. It could also be the resonator under the manifold with a small leak which could eventually look like Mackat's one lol.
Left and right movement I'd check the P bush and track rod end.
Erratic idle is an odd one...I've never had a 306 idle as well as the current GTi6, despite all it's other faults. Can you tell if the throttle body has been off the manifold? If so it's likely the gasket between them was broken. It could also be the resonator under the manifold with a small leak which could eventually look like Mackat's one lol.