My air conditioning nightmare.2000 Grand caravan

Yaaa,the ac is working,sort of...I ordered the new line some time ago.the wrong one came in so it got reordered.It finally cam in on tuesday,got installed today. The ac blows very cold,but only at highway speeds. I'll assume this is due to pressure bilding up in the system and a lerger heat transfer at the condensor. The ac works at at idle in the parking lto but not as well. There is a hissing noise coming from both evaps sometimes there and sometimes not. at times the ac works not at all.I believe the h valve needs to be replaced.They are cheap so why not...


Hissing sounds coming from either evap is normal and is only the valve regulating the correct amount of refrigerant into the evap core. The fan on the passenger side would be the condenser fan...is it running at idle when the a/c compressor is engaged? Most are two speed, meaning the second highest speed would be needed(more air flow)if the high side pressure climbed to a predetermined cut in point. A high pressure switch in the high side line controls this. Guys I have been overwhelmed this a/c season here in Va. and its not over by a long shot! Dave www.davesautocool.com