Question about 2008 Dodge Grand Caravan

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I was charging a/c head psi went to high. fans wiil not come on when you turn on a/c on. the fan will work when the car get hot. please help?

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  • samcarter Sep 05, 2008

    this did help me thank you



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Ac fan fuse mine did the same thing on the driver side firewall

Posted on Sep 10, 2008

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I dont think there meant to i think there only meant to come on when the engine (a/c) passes a certain temp

Posted on Sep 01, 2008


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fazsoliz: If the A/C system is not properly charged, it will not cool properly. Usually it is noticed at low speeds because the compressor is turning slower. If you bring the RPM up, you would probably notice it would start to cool a little better.
HOWEVER, there is a danger if the system has been over charged and you do not have enough air flowing over the condenser to keep the head pressures down. The hotter it is outside and the more overcharged the system, the higher the pressures will be in the system. They can reach dangerously high pressures in excess of 300 psi. This can cause hoses to blow, a/c evaporators and condensers to fail and compressors to fail.
If the refrigerant is contaminated or if the system had been opened and had not been properly evacuated before charging, it could have moisture in it as well as air.
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I have found in very hot climates, that installing an electric fan in place of the engine driven fan made a vast improvement on the performance of the a/c at idle and low speeds. I have an old Mercedes diesel wagon which I converted from R-12 to 134-A.
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Vehicle overheats easily. Sure it needs either a water pump replacement or a thermostat replacement.

check if the cooling fan cuts in if so see if the radiator is hot? If the rad is not hot probably needs a thermostat if it is hot could be water pump or head gasket

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Both fans, motor and A/C is not working properly.

hello yafrivera,

does your car's engine is straight to the radiator?. meaning does it has its mechanical fan attached to the water pump of the engine?

if that is the case, then the ac fan that you are reffering to is the auxilliary fan where in it is triggered by the high pressure switch.

that is just normal for that fan to run at 350 psi then turns off at below 200.

that only means that you are low on gas because the normal pressure of the condenser is 250 psi.

if you are under charged, the pressure drops below 200 and cuts the fan, as the fan stops, pressure again shoots to 350 and triggers the fan back on, and so on..

but if the charge is correct, as you turn it on the first time, the pressure shhots to 350, cuts the fan on, pressure drops to 250 at full charge then the fan would no longer stop.

i hope i was able to solve your problem...

pls rate me



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1 Answer

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If not, check radiator/condensor for dibris outside, and or corrosion inside the radiator.

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