Vent Air Temperature question

[charleyk]

Does anyone know what the proper vent air temp range is for a system converted to r134a on a 86.5?

I have done the conversion and am seeing 51 degrees on the road with outside temperature at about 90-95 degrees and high humidity.

The car cools off well but it takes some time and was wondering if anyone thought I could do better?

thanks...

 

[figgie]

Does anyone know what the proper vent air temp range is for a system converted to r134a on a 86.5?

I have done the conversion and am seeing 51 degrees on the road with outside temperature at about 90-95 degrees and high humidity.

The car cools off well but it takes some time and was wondering if anyone thought I could do better?

thanks...

hmm that is high.

I see 42 degrees vent temps with a/c on high, windows down and 92 outside.

 

[bmoss85]

who needs a/c

 

[charleyk]

hmm that is high.

I see 42 degrees vent temps with a/c on high, windows down and 92 outside.

Point taken.

 

[SPD TRP]

Mine goes from 39* to 45* on recirc and fan on high in Houston, cruising down highway, outside maybe mid 90's. Converted to r134 by previous owner.

Wayne

 

[CRE]

Recirc. versus fresh air makes a difference with my car. My system hasn't been converted by the way.

 

[Oldskoolturbo]

r134 in a converted system needs a larger condenser to have as high of efficiency as a r12 system had..

depending on how thorough the previous owner was when doing the conversion will have a huge affect on how the system performs..

but having vent temps between 35 (which is quite low for 134) and 55 degrees is normal. and your vent temps at idle are typically gonna be higher on any converted system.. closer to that 55 mark

 

[charleyk]

Mine goes from 39* to 45* on recirc and fan on high in Houston, cruising down highway, outside maybe mid 90's. Converted to r134 by previous owner.

Wayne

Do you know how much freon you have in there? I used the spec amount which was .6KG or appx 1.4 lb. I read somewhere that r134a is not as efficient as r12 so using some extra (1/2 lb) might get the temp colder. I'm hesitant to add more since I'm concerned about rupturing any seals.

thanks

 

[charleyk]

r134 in a converted system needs a larger condenser to have as high of efficiency as a r12 system had..

depending on how thorough the previous owner was when doing the conversion will have a huge affect on how the system performs..

but having vent temps between 35 (which is quite low for 134) and 55 degrees is normal. and your vent temps at idle are typically gonna be higher on any converted system.. closer to that 55 mark

thanks for the explanation, oldskoolturbo. That may explain why I'm seeing a higher temperature. I did not change the condensor. Any thoughts on adding extra freon to compensate for efficiency?

 

[bluepearl]

Do you know how much freon you have in there? I used the spec amount which was .6KG or appx 1.4 lb. I read somewhere that r134a is not as efficient as r12 so using some extra (1/2 lb) might get the temp colder. I'm hesitant to add more since I'm concerned about rupturing any seals.

thanks

You are supposed to use about 20-25 percent less in a converted R134a system.

 

[Poodles]

was the drier replaced?

was the system sucked down and converted properly?

is your IC/condenser/radiator have tons of bent fins and full of rocks?

do you have your electric fans coming on, and is your main fan functioning properly?

is your car overheating at all? (this will turn off your A/C system, and EVEN before your damn temp gauge moves past the middle!)