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Tim011696 09-26-2017 03:31 PM

A/C Question
 
I have two questions. I live in Florida and have a 2003 Saturn L200. During hot and sunny days when my car has been sitting in the sun for a few hours, my A/C doesn't turn on AT ALL. However, when it is cool outside, my A/C works perfectly. What would cause this?

Also, when it is night time, my headlights automatically switch from normal headlights to high beams. I can't seem to find a way to disable the automatic change besides manually changing the knob on the switch every time I drive at night. However, I'd prefer not to manually have to change my lights every time due to fear that I may leave them on by accident and ruin my battery. I find it kind of annoying because I almost never use high beams (I live in a city and I don't want to blind drivers).

fdryer 09-26-2017 06:46 PM

Re: A/C Question
 
1-Manual or auto climate control?

2-Does the high beam switch operate correctly when manually selecting low or high beams?

nancy gilbert 10-02-2017 11:27 PM

Re: A/C Question
 
Just a thought on the A/C issue (assuming it is manual control) -- there is a possibility that someone has overcharged the unit. With high temperature sitting in the sun, it may exceed the hi-pressure cutoff switch. Unless you know what you're doing with pressure gages, I'd recommend having a reliable A/C shoppe take a look at it.

fdryer 10-03-2017 12:31 AM

Re: A/C Question
 
While overfilling is possible with higher than normal operating pressures, turning on ac shouldn't have any high pressures triggering the pressure switch to signal the pcm to disable compressor operation.

[I]The A/C refrigerant pressure sensor protects the A/C system from operating when an excessively high or low pressure condition exists. The PCM/ECM disables the compressor clutch under the following conditions:

*A/C high side pressure is more than 2900-2997 kPa (420-435 psi). The clutch will be enabled after the A/C high side pressure decreases to less than 1998 kPa (290 psi).
*A/C low side pressure is less than 180 kPa (26 psi). The clutch will be enabled after the A/C low side pressure increases to more than 248 kPa (36 psi). [/I]

Even in HOT and HUMID weather in southern parts of the USA, I doubt overfilling would raise static pressures (car sitting in hot/humid sun) over 420 psi. To raise static pressures high enough to prevent ac from running at engine startup would require at least as much as another can of refrigerant above the amount specified. One member observed his system static pressure around 150 psi in 100F temps with a normal amount of refrigerant. If someone were to overfill a system with more refrigerant than required, this would have to be while the engine's running with ac on. Whether excessive refrigerant triggers the pressure switch to disable the compressor while performing topping off or afterwards while driving doesn't matter - the higher engine rpm means higher compressor rpm, translating to higher operating pressures where the high side exceeds 420-435 psi where the pressure sensor signals the pcm to disable compressor operation otherwise the higher operating pressures may rupture anywhere in the system with a loud explosion. Several steps are needed to approach this hazardous level of danger and would have to be deliberately done from ignoring procedures and safety. Fortunately, the majority of ac problems never approach this level of ignorance to deliberately add more than the required amount of refrigerant. There will be exceptions though and hopefully either the pressure sensor disables compressor operation to prevent higher pressures or the mechanical relief valve on compressors trigger and blow off around 525 psi.

This pressures below (service manual) are at high outside temps/high humidity and normal refrigerant amounts in a service bay;
38C (100F).....low side 179-193 kPa (26-28 psi)....high side 1702-2412 kPa (247-350 psi), engine high idling@2k rpm.

Russet 10-03-2017 10:01 AM

Re: A/C Question
 
[QUOTE=Tim011696;2255482]I have two questions. I live in Florida and have a 2003 Saturn L200. During hot and sunny days when my car has been sitting in the sun for a few hours, my A/C doesn't turn on AT ALL. However, when it is cool outside, my A/C works perfectly. What would cause this?

Also, when it is night time, my headlights automatically switch from normal headlights to high beams. I can't seem to find a way to disable the automatic change besides manually changing the knob on the switch every time I drive at night. However, I'd prefer not to manually have to change my lights every time due to fear that I may leave them on by accident and ruin my battery. I find it kind of annoying because I almost never use high beams (I live in a city and I don't want to blind drivers).[/QUOTE]

You need to give a answer to this question before anyone can proceed further.

[QUOTE=fdryer;2255495]1-Manual or auto climate control?

2-Does the high beam switch operate correctly when manually selecting low or high beams?[/QUOTE]

Also to your A/C working when cold seems to indicate a leak in the A/C and should be take to a A/C shop to find the leak. Also from the read of the high beam switch sounds like your hi-low beam switch on the left side of the steering wheel is not working and have you check this switch?

pierrot 10-03-2017 11:49 AM

Re: A/C Question
 
[QUOTE=Tim011696;2255482]...when it is night time, my headlights automatically switch from normal headlights to high beams. I can't seem to find a way to disable the automatic change besides manually changing the knob on the switch every time I drive at night...[/QUOTE][FONT="Palatino Linotype"][SIZE="3"]Welcome to SaturnFans, [B][I][COLOR="blue"]Tim011696[/COLOR]![/I][/B] FWIW, it seems to me that the likely source of your problem here is within the headlight/turn signal combination switch. All of the wires for lighting lead back to this switch and cannot be turned on by any other source.[/SIZE][/FONT]


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