Air conditioning blowing hot air after repairs to exhaust manifold.

My vehicle is old, but I like it so I decided to do some major work with the exhaust manifold and some other things. (Bill was over $4,000.00)
I had them check over the whole Jeep before they did the repair to make sure there was nothing more wrong with it. (There was no point spending much more that $4,000.00 since the vehicle was not even worth that amount. They assured me they had checked all the systems and could find nothing else wrong.

When I took it in for the repairs, the air conditioning worked great. Very cold and strong blowing. (I had previously replaced the blower)

When I picked it up, after the repairs had been done, the air conditioning was still blowing but warm air, not cold. So, took it back and they said they were really embarrassed that they had not discovered that the compressor and evaporator needed replacing as well as another part (in addition to the previous work)

They then quoted me an additional $1,600.00 for this second repair and guaranteed me that they would clean and flush the system and the manager said he would personally take the Jeep out after the additional work and make sure I had cold air. Needless to say, when I picked it up today, (after they assured me I had cold air, I found that I had cooler air but not cold air.

It was very hot outside so I took the jeep home and took it out this evening after dark to see if I could get it to blow cold like it before. It was slightly colder than during the day but not to the same degree it had been before I took it in for the repair.

Do you have any idea what could be going on with it. I am going to take it back to them in the morning to the repair shop and want to know what to say to them.

Zoe