 |
 | Home | Contact Us | FAQ | Search & Site Map | Link to Us |
 | Sign In | Join | Other 45 Sites in Network |
Car Forum / Honda Cars / January 20051995 Prelude A/C Compressor
I just added refrigerant to my 1995 Prelude SE (125,000 miles), and noticed both while I was recharging and after that the compressor doesn't cycle off. Is it normal for Honda compressors to run full-time (while the "A/C" button is on)? I can't specifically remember if it cycled during the years I've owned it. If it SHOULD be cycling, what would prevent it from doing so? Using the manual "A/C" button on the console does cause the compressor to turn off, as normal. One item to note, is that I used one of those inexpensive "system recharge" packages from the auto parts store to add refrigerant, which seemed to work well, but it only measures low-side pressure. Thanks for your help. It is normal for the A/C to cycle on and off unless the temperature is quite high. In warm weather it typically have a higher duty cycle in "Fresh" than "Recirk". (Opposite if using the A/C in cool weather e.g. to defog). The cycling is controlled by the thermostat mounted in the evaporator housing. Specifically, the ECM controls the A/C compressor clutch relay based on a call for cooling. The call for cooling gets to the ECM through (in order from ECM to ground) 1.) the A/C pressure switch in one of the refrigerant lines, 2.) The A/C thermostat in the evaporator housing, 3.) the A/C main on/off switch on the dash and 4.) the ventilation fan switch on the dash (separate pin grounded with fan switch in any position except off). The A/C pressure switch is a safety-lockout. This switch is normally on at all times. >From my home central A/C I know that too much refrigerant will reduce the cooling capacity of the A/C system. Perhaps you overcharged the system, have reduced cooling capacity and thus the evaporator never gets cold enough to turn off the compressor? Measuring only the low-pressure side is somewhat dubious. For proper charge, filling to a specific pressure is not sufficient, the correct pressures (high and low side) depend heavily on outside temperature *and* humidity. Since R134a is cheap I would try removing some refrigerant (observing all relevant environmental regulations, precautions and safeguards) and see if that helps. > I just added refrigerant to my 1995 Prelude SE (125,000 miles), and noticed > both while I was recharging and after that the compressor doesn't cycle off. [quoted text clipped - 6 lines] > refrigerant, which seemed to work well, but it only measures low-side > pressure. Thanks for your help. > It is normal for the A/C to cycle on and off unless the temperature is > quite high. In warm weather it typically have a higher duty cycle in [quoted text clipped - 32 lines] > > refrigerant, which seemed to work well, but it only measures low-side > > pressure. Thanks for your help. put a manifold on it and check the temps lo side and high side normaly the compressor go's on and off all the time to prevent that the evaporator would not freeze.. maybe you over charged it ... temp 134a should be +/- -10?C lo side greetings frederik L |
Reply to this Message |
 Sign In
 Join
 My Latest Posts My Monitored Threads My Blog My Photo Gallery My Profile My Homepage Start New Thread Enable EMail Alerts Rate this Thread
|
©2008 Advenet LLC Privacy Policy - Terms of Use
This website includes both content owned or controlled by Advenet as well as content owned or controlled by third parties.