406 diesel queries

Hi all

I know very little about cars and I hope someone here can help with these questions:

1. Tyres - correct pressures for normal use? Tyre types are:195/65, manual says 2.3 front 2.4 rear, what's this in PSi? Also, I thought the front ones would have a higher pressure due to the weight of the engine??

2. Coolant - On holiday last week I was caught in a traffic jam, engine temp was up at 90+ for a few hours and the "low coolant" warning light came on and off intermittently. Initially on flat ground, then only when going up a hill. On the return journey the temp was fine and the light stayed off - has not come on again since. I checked the coolant level today and it seems to be correct (between narrow bar and side-slot in tube insert). When I looked in the manual it said only to have coolant topped up at a dealer and only to use two specific types of coolant (Procor 3000 or Revkigel 107 only). Haynes just says to top up with a mixture of antifreeze and water - any advice for future reference here and comments on the warning light??

any patient assistance appreciated. :-)

Andy