Quote:
Originally Posted by ganun
Simple answer is yes, but it's due to running with somewhat undercharge which achieves dual functions. One is to get a cold evap, and two is to provide hi side head room, i.e. keep hi pressure from going too hi if in heavy traffic for example.
Ideally one would charge enough so that low side pressure corresponds to just over 32F, but with the 911 system that would put the hi into the too much pressure, definitely over if caught in traffic.
The down side of the undercharging setup is monitoring temps, since like I said before there is no climate control computer.
Around town on normal traffic this is no problem, there is no freeze up, but on the hiway it will freeze up after an hr or so if you don't realize vent is in the 30s and you don't turn up the thermostat.
|
In your '87 you can ameliorate, at least partially, your heavy traffic high pressure problem via connecting a high pressure or temperature detection system(***) to the engine heat sensor input to the cabin heat controller. The cabin heat blower will then activate automatically in low speed sop and go traffic thereby providing additional cooling airflow through the rear lid condenser on an as needed basis.
Side benefit is that some of the airflow "preheated" by the rear lid condenser is diverted around the engine.
***Trinary pressure switch or....
Senasys -