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Low Air From AC Vents


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After spending all time and money as most of you know i am still having issues with my AC. My biggest problem is air flow vey low, when i compare with @skumar83's Jeep. It is like i am having less than half of his air flow. Air looks cold if i keep my hand very close to the vents but that cold air is not powerful enough to coming inside the cabine. When i am in the work i am keeping my car parked outside i dont have covered parking in the work. When i went for launch breake car is burning because of hot weather and AC starts giving half cold air after 5min and after 15min it is became good. Which is in the mid day when i am going for lunch i dont have AC.  

 

@shadow79 saying; there is box inside the dash for vents, this box is old now and not sealed. So problem is as he said box is not available now in scrap. Is there any idea to make this box seal again? Also is there any other idea instead of box? I was thinking blower motor is worned out but Saleem said he already opened and cleaned it was good condition. If there is any other parts i can check i want to check their condition. Ac gas, Ac radiator and Compressor is newly changed. 

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Usually in a case like this, it's a blocked AC filter, it's also called pollen filter in some countries. I've done a couple this week. But as far as I know, the XJ doesn't have one. 

Maybe it is leaky ducts like Saleem said. Put your hand up behind the dash, see if you can feel air blowing out from somewhere it shouldn't be. If you have an air leak in the system, it could be a real pain to repair it. You might need to remove the dash and seal all the leaks with silicon, assuming you don't want to buy the original seals which are probably obsolete.

Also just to add from your original post. If you're leaving your car in the sun, the AC has to cool all your pipes and your dashboard before it can put out cold air. The cold air might be there but all the hot plastics are heating it up by the time it gets to the vents. Consider one of those dashboard carpet things.

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2 minutes ago, Barry said:

Usually in a case like this, it's a blocked AC filter, it's also called pollen filter in some countries. I've done a couple this week. But as far as I know, the XJ doesn't have one. 

Maybe it is leaky ducts like Saleem said. Put your hand up behind the dash, see if you can feel air blowing out from somewhere it shouldn't be. If you have an air leak in the system, it could be a real pain to repair it. You might need to remove the dash and seal all the leaks with silicon, assuming you don't want to buy the original seals which are probably obsolete.

As you said there is no filter in this system. We already opend the dash 2 times but i think he passed to seal this part. There was air blowing to engine bay before we close it with foam. Now it is leaking under dash also Saleem saying we will also fill it with foam but i dont believe closing it will change the performance. 

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Just to get this right in my mind. The air from the blower fan is blowing into the engine bay?

Mental. I never seen seals that bad before.

If it's blowing under the dash, the only option is to seal the leaks. Foam is ok but it's not 100%. Patch it up with silicon and let it cure properly before it dries would be the only option for me.

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15 minutes ago, Barry said:

Just to get this right in my mind. The air from the blower fan is blowing into the engine bay?

Mental. I never seen seals that bad before.

If it's blowing under the dash, the only option is to seal the leaks. Foam is ok but it's not 100%. Patch it up with silicon and let it cure properly before it dries would be the only option for me.

I also never seen any AC like this before. I used my Peugeot 206 from 2006-2017. In my country summers degree will reach more than 40C. Even those time i never used my AC more than 2/4 power. Mostly 1/4 was more than enough and if there is no bright sun i was closing it time to time because it was very cold. With this AC i am always using it 4/4 power and for day time it is not even enough. Mental, Brutal you name it. 

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@desertdude can you please refer Sertac that AC specialist in DIP you have been referring me in the past?

Maybe the second opinion and a thorough check will cure his Cherokee's AC.

Let's root for each other & watch each other grow.

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Until the time you actually fix the issue, use the windshield sunshade while parking the car and leave all 4 windows 1-2 cms opened so that heat won't be trapped inside.

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Let's root for each other & watch each other grow.

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Sure thing, look up Ampex in DIP, they are AC specialists and thats the only thing they do and charges are very reasonable. Im on my phone otherwise I would have posted their link. But google Ampex DIP and it should pop right up.

From what I gather, having gone through a huge AC situation last year in my old range rover. And reading all the information providee I think you have a weak blower motor or you blower motor resistor sonetimes called the final stage resistor which controls fan speed is on its way out. 

Its located behind the glove box on the XJ and is easily accesible and not a hard DIY job.

Ductimg behind the dash could also be an issue but easy to solve. Turn motor to full speed, If you hear the blower blowing hard like a mini windstorm going on in your dashboard but no or low air from the vents then you have a leak.

I had similar issue in my ride and guess what I fixed the ducting issue with.......duct tape! 

 

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6 hours ago, desertdude said:

Sure thing, look up Ampex in DIP, they are AC specialists and thats the only thing they do and charges are very reasonable. Im on my phone otherwise I would have posted their link. But google Ampex DIP and it should pop right up.

From what I gather, having gone through a huge AC situation last year in my old range rover. And reading all the information providee I think you have a weak blower motor or you blower motor resistor sonetimes called the final stage resistor which controls fan speed is on its way out. 

Its located behind the glove box on the XJ and is easily accesible and not a hard DIY job.

Ductimg behind the dash could also be an issue but easy to solve. Turn motor to full speed, If you hear the blower blowing hard like a mini windstorm going on in your dashboard but no or low air from the vents then you have a leak.

I had similar issue in my ride and guess what I fixed the ducting issue with.......duct tape! 

 

Yes i am hearing windstorm from dash. Sometimes also i am hearing another sound like snake thhhissss. Most probably i have bad leak in there.  

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On 4/30/2018 at 8:06 AM, sertac said:

Yes i am hearing windstorm from dash. Sometimes also i am hearing another sound like snake thhhissss. Most probably i have bad leak in there.  

As suggested, duct tape, there is nothing duct tape can't fix!

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