KA24E--Getting the AC to blow colder air

[mick]

I have a SOHC 1990 KA24E. I had the A.C. redone. I replaced everything but it doesn't seem to be as cold as it should be. There are no freon leaks.Is there a larger AC Compressor or something else I can change to make the air colder?

[greencar]

How is the Cabin filter, has it been changed recently?

-Dan

[Bongpain]

yes.. definitely check the cabin filter and also pull the blower motor out and check for rats nest that might restrict the air flow from the propellers. sometime you can tell my strange noise but sometime it get plaster to the wall of the blade and you will not hear it. also if you have too much freon or too little that will also effect it. or maybe not enough peg oil or too much peg oil when you replaced the compressor. all just a suggestion maybe you can ask yourself as you diag the problem.
Modified by Bongpain at 4:31 PM 5/20/2009

[mick]

Where is the filter? How do you get to it? Do you clean it or replace it?Is it possible to get a bigger condenser for the S13?

[locoluna825]

lol there are no filters in 89 240s, do you know if yoru refigerant in the system is the original type or has it been converted to the new stuff. if it is the new stuff ide go have it checked to see the pounds and have more refrigerant put into if possible. if its the original stuff go have it converted ittle definitely blow colder.

[Cone Junky]

How much refrigerant was put in? Is it still R-12? What are the low and high pressures of the system? Is your condensor clean? Is the condensor fan working?

If you had someone do the service, they should be able to answer or verify everything done.

[mick]

"How much refrigerant was put in? Is it still R-12? What are the low and high pressures of the system? Is your condensor clean? Is the condensor fan working?"

The condensor & evap & compressor are new. The fan works. It is using the 134-not R12.

What is the name of the insulation that is on the lines going into the firewall? Where can I get more?Where is the blower motor under the dash---the round thing on the far right under the dash?

[Wc240]

not sure of a special name. but i do know that when lines dont have there insulation anymore, they heat up. if a shop did the work, id take it back(or to another) with summer starting, most shops will have free or cheap performance tests to see if your system is/isnt running at optimal performance. or you can do it yourself. its pretty easy

[Bongpain]

check these out. remove and clean make sure nothing is in there.and this is your heating and ac set up. good luck.

[mick]

check these out. remove and clean make sure nothing is in there.and this is your heating and ac set up. good luck.

Where is the Detail A Screen? Behind the blower motor?How do you remove the blower motor?

I went out looking for pipe insulation and only found some foam stuff that would melt. Would "Insulation Tape" work if I wrap the pipe with it?

[amolao]

The SOHC is not a very efficient AC system to begin with. It was the #1 complain from users when the car came out originally. I replaced the complete system on mine, due to a compressor failure and no difference. And then the upgrade to R-12 made even worse, is not as good as freon. The only thing that seem to help was the upgrade to an aftermarket pulley. It keeps cool under load a little better.

[Bongpain]

well i don't know of all that exact A/C performance of any other 240 but mine was clean out. because of the almost 20 years of leaves. but anyways. the mesh is located outside next to the wiper blades. pull those pieces out then you can make sure there are no leaves or obstruction just reach under there and look around. not hard to do just for the heck of it. blower motor is behind the glove box. remove the box by, open the glove box then push to the left to release the top right side, once that drop down pass the stop tap do the same thing the opposite way to release the left. when you have that off you will see a white box with a black nipple at the bottom of it and three screw hold that together remove those and it should pop off. with that still off you should check the intake door motor make sure its working full potential. just again look around too see any restriction. refer to graphic for what am talking about. good luck.

[mick]

I converted to the R134 and it has been 1 year since replacing everything. Now the system isn't cold at all. Must be a leak.

[Wc240]

if its not cold at all, id check your pressures and check for a leak to do anything.-bigger compressor/condensor,not gonna happen. compressor wouldnt do anything and a (thicker) condensor would cool a lil bit better, but youd have to make custom lines, and it'd be a big headache.R-12 IS what peaple called freon. there was no 'upgrade' to it. and r12 actually does a better job cooling/blowing cold, but its very bad for the enviroment so they got rid of it. right now, its about 117-135 a pound.-the a/c system is a decent/perfectly acceptable system, when operating fully. one common problem is due to the old nature of these cars, noone keeps up on them. also, due to age, they dont retain temps very well. my car blows ice cold, but shut the a/c off and the car starts heating up quick. newer cars you can shut the a/c off and cruise around for a while and itll stay cold inside.

"The SOHC is not a very efficient AC system to begin with. It was the #1 complain from users when the car came out originally. I replaced the complete system on mine, due to a compressor failure and no difference. And then the upgrade to R-12 made even worse, is not as good as freon. The only thing that seem to help was the upgrade to an aftermarket pulley. It keeps cool under load a little better." i dont even know where to start on this one

op- go and buy a uv kit. there at any auto store for pretty cheap, sometimes for under ten buks(tho, not very good, itll do its job) should come with a uv light and some orange glasses. then go CSI on your car. one good thing about 134 is it normally has uv diy already in it. dont mind if you see some at the service ports, thats just overspray from connecting the hoses.if that doesnt work check your pressures, then get back and post what you find

-coffee

[mick]

Would a 300Z compressor fit with the SOHC engine and be colder?

[1KleenS13]

What did the shop replace exactly?

[maryjane]

no the z comp will not fit

[hboninc19]

Is your condensor fan coming on. Is the clutch cycling

[mick]

A year ago I replaced the receiver/dryer, compressor, and condenser. Everything is working.

[Wc240]

did you ever have the pressures checked? you can tell alot by the pressure readings

[mick]

The AC shop said nothing is wrong. They said if I was using R12 it would be colder. Since the car was made for R12. Only $600 a pound for the stuff. Keeps 8 months on the shelf