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Old 03-25-2019, 05:31 PM
ApronRack ApronRack is offline
Learning to use the forums
Join Date: Mar 2019
Posts: 1
Default A/C will only blow cold at high rpms? 2.3l

Howdy yall, I've encountered a problem with the A/C in my 2001 2.3l. 5spd. It will only blow cold at high rpms, around 3k, but if it drops below that it just gets warm. I've done some googling and havent found much, any ideas? I live in Houston and summers coming, wanna get this taken care of soon lol

Apologies if this is posted in the wrong spot, I'm new to these forums.

Thanks y'all!
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Old 03-25-2019, 08:54 PM
IA Transplant IA Transplant is offline
Spray Painted Ranger
Join Date: Jan 2019
Posts: 89
Default Re: A/C will only blow cold at high rpms? 2.3l

Check if your refrigerant is low on lbs. Or check if your compressor in the engine compartment is getting cold. Does it blow cold when its at 3k rpms in park or when you drive?
2001 Ranger XLT 2wd | 18" TSW Sonomas
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Old 03-26-2019, 03:49 AM
tomw0 tomw0 is offline
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Join Date: Aug 2015
Posts: 1,000
Default Re: A/C will only blow cold at high rpms? 2.3l

Check for proper airflow over the condenser(in front of radiator). If the flow is restricted due to collection of bugs, leaves, and road junk, the condenser cannot give up heat as well as one that is clean. If the fan does not blow air over the condenser, or cannot, the condenser cannot give up heat.
Watch the suction line on first startup of the engine or when you first turn on the A/C. The suction line should get 'frosty' for a few seconds as the refrigerant boils. The compressor will suck the refrigerant out of the evaporator, making it boil. When it boils, it absorbs heat(has to get heat of boil from somewhere), and causes the suction line & evap to frost up. If the refrigerant level is too low, the compressor will be turned off due to the low pressure cutoff switch opening up and letting the compressor clutch release. The LPCO switch protects the compressor from damage due to lack of refrigerant flow(the refrigerant carries the lube oil for the compressor) and also prevents the evap from freezing up. If allowed to run, and pull low low pressure in the evaporator, the evaporator would go below 32F, and get condensation, which would turn to ice. no bueno. Ice would block airflow over the evap, and you'd have something that needed defrost regularly. Keep the evap temp ~32-34, and you will condense the water from the atmosphere, but not cause freeze up. The LPCO will cut clutch power if too low on refrigerant, and when pressure comes back up, re-engage the clutch. "Short cycling" is the term used to describe bad behavior.
Check for that, and if the clutch is cycling, you are likely low on refrigerant. BUT there can be other reasons for short cycling and also HPCO(High Pressure Cutoff/cycling) if there is blockage or restriction, or the fan not blowing air over the condenser.
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2.3l, a/c

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