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Old 09-25-2008
frdrangr369's Avatar
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Join Date: Jan 2008
Location: clymer, pa
Posts: 100
heater/AC problems

so i just got my ac recharged about 2 weeks ago and now every time i use my ac or my heater my ac pump is constantly kicking on and off, the part i dont get is why is it kicking on and off when im using the HEATER. and not to mention it bogs my truck up and down. like every 5-10 seconds....any ideas is to why this is happening?
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Old 09-26-2008
federal20's Avatar
Join Date: Jun 2008
Location: TX
Posts: 12
my a/c will crank up then stop and keeps doing this the whole time its on also it will make my truck idle up for a min or two i dont know y i need help too
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Old 09-26-2008
FireRanger's Avatar  
Join Date: May 2004
Location: CT
Posts: 0
define constantly kicking on and off. Because it is normal for it to turn on and off at a regular interval. Heat is applied after the air is cooled so the fact that you have the heat on is irrelevant.
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Old 09-26-2008
V8 Level II's Avatar
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Location: Michigan
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A/C cycling frequency is regulated by the low pressure cycling switch. Generally speaking, R134A systems like yours do tend to cycle more frequently than the old R12 systems. If the cycling is a lot more frequent than you remember on this vehicle, have the charge rechecked. It may be underfilled.

AC compressor operation allowed:
Max AC

AC compressor operation not allowed:
Vent only
Floor only

As shown above, A/C compressor logic is dictated by the mode switch position, not by the temperature selected on the dial. Beyond that, compressor clutch engagement can be disallowed by the Low Pressure Cycling switch, High Pressure Safety Switch or the PCM when in power mode.
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Old 09-27-2008
kyle12201's Avatar
Join Date: Apr 2008
Location: East Waterboro, ME
Posts: 1,543
mines doing somthing similar but i got it checked out and the coil wires are shorting out against my oil filter. dont know if you are having the similar problem but that is mine. getting that fixed this week :\
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