A/C low pressure valve

[killiah]

Where is the A/C low pressure valve located on a 98 grand prix gt 3800???

[BNaylor]

Originally Posted by killiah

Where is the A/C low pressure valve located on a 98 grand prix gt 3800???

Welcome to AF.

It is located right next to the accumulator on the low pressure line feeding the accumulator on the driver's side of the car. Plus you will see the sole wiring harness going to it.

BTW - It is a low & high pressure switch combined.

[killiah]

Originally Posted by bnaylor

Welcome to AF.

It is located right next to the accumulator on the high pressure line feeding the accumulator on the driver's side of the car. Plus you will see the sole wiring harness going to it.

BTW - It is a low & high pressure switch combined.

Is it connected onto the firewall? or is the one near the airbox on the drivers side? if its the one attatched to the firewall then my gueage is the right guage an therefore my next question.

So if i wanted to charge my freon which i do. I have the the freon and a interdynamics guage and hose line that hooks right on to it. it shows around 170 on the guage saying warning. how can i fgill my ac with freon? there is way to much pressure pushing out to put anything in. what do i do?

[maxwedge]

Originally Posted by killiah

So if i wanted to charge my freon which i do. I have the the freon and a interdynamics guage and hose line that hooks right on to it. it shows around 170 on the guage saying warning. how can i fgill my ac with freon? there is way to much pressure pushing out to put anything in. what do i do?

By the nature of your question you really need an ac pro to do this for you, also the system is charged from the low side access port not a pressure switch fitting, I would advice stopping now! Plus where did the freon go? The low side port is under the air box.

[killiah]

Originally Posted by maxwedge

By the nature of your question you really need an ac pro to do this for you, also the system is charged from the low side access port not a pressure switch fitting, I would advice stopping now!

I don't think i need an A/C pro to charge freon into a car. just what tools are required. I spent 8 years as a f-16 mechanic. so if i was going to blow myself up i would have done it by now

[BNaylor]

Originally Posted by killiah

Is it connected onto the firewall? or is the one near the airbox on the drivers side? if its the one attatched to the firewall then my gueage is the right guage an therefore my next question.

So if i wanted to charge my freon which i do. I have the the freon and a interdynamics guage and hose line that hooks right on to it. it shows around 170 on the guage saying warning. how can i fgill my ac with freon? there is way to much pressure pushing out to put anything in. what do i do?

The low port to recharge is firewall only!!!! 170 is too high and probably the high side port. Low port has the smaller valve.

It can be done DIY but if you have no experience leave it up to a Pro A/C person.

[BNaylor]

Originally Posted by killiah

I don't think i need an A/C pro to charge freon into a car. just what tools are required. I spent 8 years as a f-16 mechanic. so if i was going to blow myself up i would have done it by now

Thanks for the service to your country.

Shep if he can work on an F16 he can DIY his car.

BTW - My son is in the Air Force stationed at Osan AFB. He is a GEF110 jet engine tech.

Good luck!

[killiah]

Originally Posted by bnaylor

The low port to recharge is firewall only!!!! 170 is too high and probably the high side port. Low port has the smaller valve.

It can be done DIY but if you have no experience leave it up to a Pro A/C person.

The only A/C port i'm finding is the one on the firewall which i had already assumed is the high side because of the pressure reading. Is the low side somewhere beneath the vehicle? out of site where i would need a jack?

[killiah]

Originally Posted by bnaylor

Thanks for the service to your country.

Shep if he can work on an F16 he can DIY his car.

BTW - My son is in the Air Force stationed at Osan AFB. He is a GEF110 jet engine tech.

Good luck!

Most of my good friends are either at kinsan or osan right now. I just got out and stayed in las vegas.

[killiah]

Ok so here is my question. I've found the high side which is on the firewall? where is the low side. someone said that the high side is also the low side. so will i need a special connector? or is there another port to input the freon? What i need to know is where to put the freakin hose an pull the lever cause its really freaking hot in vegas an i have no A/C and no tint and its like 108 outside right now!!!!

[killiah]

O an im at work in a suit. I really want to charge this A/C haha. its hot... really really hot. and i dont want to use mac trucks to shadde my drive home anymore.

[BNaylor]

Originally Posted by killiah

Ok so here is my question. I've found the high side which is on the firewall? where is the low side. someone said that the high side is also the low side. so will i need a special connector? or is there another port to input the freon? What i need to know is where to put the freakin hose an pull the lever cause its really freaking hot in vegas an i have no A/C and no tint and its like 108 outside right now!!!!

No, the low side is the one at the firewall on a Grand Prix. The high port is by the accumulator which is that big cylindrical looking part which is similar to a receiver drier unit in other GM cars.

You put the R134a refrigerant into low side port only. It has the smaller valve/fitting.

If you are immediately getting a high reading on the low side port and your testing equipment is not at fault then it could be a bad orifice valve or worse case a compressor. When low side pressure matches or is within 30 psi of high pressure then those are the possibilities.

BTW - My son is with the Dragon Lady. Thats all I can say or they will kill me....lol.

[killiah]

Originally Posted by maxwedge

By the nature of your question you really need an ac pro to do this for you, also the system is charged from the low side access port not a pressure switch fitting, I would advice stopping now!

well i overlooked your anwser thanks. It seemed to have trickeld out over the winter. i'm sure i have a leak somewhere but i want to see how bad it is.

[killiah]

Originally Posted by bnaylor

No, the low side is the one at the firewall on a Grand Prix. The high port is by the accumulator which is that big cylindrical looking part which is similar to a receiver drier unit in other GM cars.

You put the R134a refrigerant into low side port only. It has the smaller valve/fitting.

If you are immediately getting a high reading on the low side port and you testing equipment is not at fault then it could be a bad orifice valve or worse case a compressor. When low side pressure matches or is within 30 psi of high pressure then those are the possibilities.

BTW - My son is with the Dragon Lady. Thats all I can say or they will kill me....lol.

hahahaha....

Ya'll i need to know exactly which one it is the one i found attatched to the firewall that sticks out and my guage attatches to is showing 170 psi which is not good. If that is not the low side then i will remove the air box but there is another chromje tube next to the airbox but the valve is different like a ball bearing. holding pressure to keep the ball in palce of the hole. a little different then the bicycle tire style valve that the one on the firewall has. plus my guage and hoseline won't fit that valve.

[BNaylor]

Originally Posted by killiah

hahahaha....

Ya'll i need to know exactly which one it is the one i found attatched to the firewall that sticks out and my guage attatches to is showing 170 psi which is not good. If that is not the low side then i will remove the air box but there is another chromje tube next to the airbox but the valve is different like a ball bearing. holding pressure to keep the ball in palce of the hole. a little different then the bicycle tire style valve that the one on the firewall has. plus my guage and hoseline won't fit that valve.

That is correct on the high side port by the airbox. You need the bigger adapter and the special gauge to read high side pressure. I have the figures from the GP GM service manual for both low and high readings so let me know if you need them. But right now you have a problem if the low pressure is reading that high. It should read around 30 - 60 psi or so depending on the ambient temperature if properly charged.