HVAC problems 04 Jeep Grand Cherokee

You are running low on freon anon, when u get on the highway ur condenser is getting more airflow because higher speeds and is producing more air. U need to put more freon on in and you should be fine.

>>17800065
thanks anon!

>>17800071
Turns out its not low on refrigerant, unless the pressure gauge is dead wrong. Reading 35 psi at 63 degrees F air temp.

Looks like im fucked

It may not be low but don't trust the readout on a refill can from Autozone. You need to hook it up to a proper machine which will accurately measure low and high side pressures. That said let's assume for sake of argument that the system is properly filled and pressures are correct. I don't recall if these had separate ac condenser fans or not but either way a fan should be kicking on or speeding up. You mentioned minimal air between both cold/hot which leads me to believe you may have a blend air door problem

>>17800572
okay I'll look into that next. Quick question-So should I just fill the refrigerant anyway? How will I know not to overfill it if the pressure gauge on the can is janky?

>>17800582
I mean you can give it a shot and it may help but any mechanic worth a shit would never advise using that. It's a bandaid at best and doesn't address the underlying problem. If it is leaking a proper shop can introduce dye into the system and make finding the leak a lot easier. This isn't to say low refrigerant is your only issue. Your hvac woes may be compound in nature