ac only works when driving slow

Nevada_545 March 27 2011 229am 9. Reason could be its overcharged with R134 so when Ac is on the compressor is srtaining but you would notice engine slow down when AC engaged if this was the case If both first causes seem to be ok then take bottom hose off and flush.

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They can cause warmer temps in city driving vs hwy driving.

. But unlike your fridge which is powered from the mains electricity the compressor under your bonnet is driven by a belt from your engine. To maintain airflow when the car is in stop and go traffic or is completely stopped condenser fans will come on automatically. No air flow no change of state no or little cooling.

Mine was 32 psi stock setup for R12. Normally car AC systems are built so that the higher the engine speed RPM the faster the AC compressor turns. If the fan isnt engagedmakes total sense to check it first.

Though having only one fan speed usually indicates a bad blower resistor a diligent mechanic at a repair shop will test the resistor fan switch and connections to. After a minute or so the low side will stabilize at the POA setting. Look for moisture around the outside of.

The compressor circulates freon in the AC system to cool the cabin and it is able to do it best when the vehicle is in motion due to the amount of power it is able to draw from the engine. Another possible cause is with the electrics of the fan. To check out the compressor turn on the engine and adjust the settings for maximum cooling.

When the car is moving versus stopped there is more air flow over the condenser the heat exchanger in front of the radiator and that airflow is essential to system operation. 1986 Nissan 300zx ac only works when. This will cause the AC to work but poorly.

The freon level is good and. As soon as you turn it ON the compressor begins to work and it acts as a load on the engine. The ac works only when the car is accelerating.

A standstill engine combined with a low amount of freon will render the compressor unable to circulate enough refrigerant both due to low power and low freon. How to fix it. Your AC Fancondenser is might be broken ie Problem with the spindle sometimes when the spindle is broken on travelling at high speeds the fan is pushed backwardsinwards and this restricts the motion of the fan and it might slow down or stop causing the compressor to heat and causing the AC to shut down.

The ice builds up until it blocks airflow. Anyone with ac in these old Hondas can contest to that fact. Car air conditioner not blowing cold air when idling is a pretty common issue related to your vehicles AC unit.

Ive tried putting it in neutral and revving the engine while waiting to move again but this does not seem to make a difference. If the compressor is cycling on and off than the system is just slightly low on freon. The fan is still blowing when I am at a stoplight or in a drive-thru it just blows hot air.

The most likely culprit is the condenser fan. The wind cools the condenserwhich cools the freonso colder air. My AC works till I stop and then blows hot.

When you need work on your air conditioning dont delay your repairs or risk further slowing your accelerationinstead schedule Volkswagen maintenance at Spitzer Volkswagen in Amherst and let our certified service technicians handle the rest. Ac only works when driving slow Apr 21. There are many reasons why you might find the AC only works when driving but doesnt blow cold air during idle.

If the AC is off the compressor is sort of free-wheeling and doesnt load up the engine. 12 min read Maine mead works kennebunk Dec 28. AC Only Works When Driving.

It probably isnt he compressor. Your Bath and body works corporate office phone number images are ready in this website. If its moving fast the refrigerant level could be too low.

While youre here were dedicated to your auto repairs needs. Low car AC charge causes evaporator freeze up and low airflow. Your air conditioner may be working but not at its intended power efficiency.

Then the AC system shuts off the compressor and you get warm humid air. It could be but there is a much more likely culprit. So now you know how your cars air conditioning system works.

You can do this by making sure the center component that engages and disengages the pulley is working. This is to prevent damage to the compressor and the components. A low system charge can cause the evaporator coil to so cold that it freezes the condensation on the evaporator fins.

If AC operation returns to normal youre not dumping enough heat off of the condenser. Read on to learn the most common reasons as well as how to fix the problem in each case. Plain and simplethese older HondasAcuras have small condensers.

Warm the engine up turn on the ac until it malfunctions and then spray a garden hose on the condenser with everything running. Answer 1 of 12. Other possible causes of low air volume if the fan isnt the culprit is that the cabin air filter is clogged with dirt and debris restricting the amount of fresh air going into the air.

This is very common. For the AC to work there has to be a change of state from gas to a liquid in the condenser in front of the radiator To get this change of state there has to be air flow across the condenser. Check to make sure the compressors clutch is engaged.

Let Spitzer Volkswagen Help. The high pressure hose is designed to increase and decrease AC pressure during different driving conditions since the AC drive belt will increase in speed as the vehicle accelerates. Inspect the condenser fan motor.

Some of these components may fail which could be the reason why your cars AC only works when driving. The quick way to check the POA setting is to run the AC at idle unplug the blower fan and look at the low side pressure. Basically the AC high pressure hose is kind of like a turbo for your AC - it supplies more pressure when youre idling and less pressure when the AC motor is being driven faster.

When running diagnostic on AC system it states that their is voltage to the compressor but the compressor does not turn on. Here are the possible causes. Driving on freeway it blows cold air but in town driving.

So more power applied to the engine means more power applied to the compressor which.

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