RENAULT ESPACE LL 1994 Air conditioning

Although he has all those years I did the engine 7 years ago and I have it up to date with all
the only problem I have is with the air conditioning cools well until the engine takes temperature, then it starts to expel hot air.
If I remove the AC but I leave the 2 engines cooling (I have a separate control) and under the temperature of the water and put the AC back to the normal cool until the water is heated again. It is that there are 2 separate circuits but I do not understand it.
Any suggestion?
Grateful

I ask
when the AC works, the fans start?
or the active you.

Thanks Antonio
I have discovered that it is the second speed in one of the fans that does not work.
I have exchanged the 2 relays that you have and apparently are fine, I have to find another 2 since I think one is wrong.

Ok solved.,
Of the various relays that it carries, this morning I have exchanged a couple of it and I found one that did not work ..
€ 4 and solved
the fault itself, that when it operated in a single fan the temperature rose
excessively and cut the AC.
Thanks in all ways for
interested