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installed rebuilt compressor. Not blowing cold.

romanjcg on Sun September 18, 2011 5:56 PM User is offline

Year: 1989
Make: Honda
Model: Prelude
Engine Size: 2.0
Refrigerant Type: R134
Ambient Temp: 55
Pressure Low: 35
Pressure High: 165
Country of Origin: United States

First off, i would like to say thank you to who ever will read this and offer thier help, thanks

Okay bought this prelude about a year ago. When I bought it the a/c blew cold for about a month and stopped blowing cold.

A few months later I had it changed over from r12 to r134. It worked for about a month and then stopped blowing cold.

That was last summer. This summer I took it to a mechanic and had him charge the system and add dye to try and find a leak. I dont know what the high and the low side readings were at this point but the a/c blew at 35 degrees and it was cold!!! Unfortunatley the very next day it stopped blowing cold.

I took it back and the mechanic found that the compressor was leaking. He told me to buy a new compressor and dryer. I bought a rebuilt compressor online and new dryer and had the mechanic install them. He told me that the compressor was bad and it was only blowing at 55 degrees and this was on a cold 65 degree morning.

So I call the online store and tell them they sold me a bad compressor and he said, "i need the high and low side readings to determine what the problem is." So I get the readings from the mechanic which are 35 on the low and 165 on the high side. He tells me that the compressor is doing its job and it must be the vent door is sticking open and is blowing both hot and cold air.

I don't know too much about AC's so I have know idea what is going on. The mechanic tells me it is the compressor and the AC store tells me it is not.

All I know is today it was 90 degrees in town and the AC did nothing to cool me off. I was sweating in my car today.

Is it possible to know how well the compressor is working from the high and low side readings? Are the readings of 35 and 165 degrees good for a cold morning of 65 degrees? Sorry i dont have the readings for 90 degrees.

As i said before i know nothing about AC's but when my old leaking compressor was charged the very last time, it blew super cold and was working nice and now with the rebuilt compressor it does not get cold enough at all.

Please help guys. Roman.

mk378 on Sun September 18, 2011 6:18 PM User is offline

If the "new" compressor came filled with mineral oil, did your mechanic change it to what was used in the conversion (usually ester oil)?

I would expect the low side to be lower. Did you test at 1500 rpm? Doesn't have to be exactly that, but raise the rpm above idle to simulate driving conditions. Also the low side line should be getting very cold, if you have that but the air is warm then it looks like reheating. In cool weather I'd expect the low side to drop to around 20 and the compressor to cycle on and off because of evaporator temperature.

Edited: Sun September 18, 2011 at 6:21 PM by mk378

romanjcg on Sun September 18, 2011 6:29 PM User is offline

The "new compressor" came dry and needed to be filled with oil. The mechanic filled it, but I don't know what he used.

I was driving today and higher rpm's did make a slight difference but it was now where near cold enough to cool off the car.

So 35 and 165 bad readings?? My mechanic did say that it was bad for a cold morning???? Do you have any ideas what it could be????

Reheating??? could you elaborate a little.

Thank you so much for input and quick reply. Roman.

TRB on Sun September 18, 2011 11:18 PM User is offlineView users profile

With the listed pressure it seems the compressor is working. Working as in pumping correctly.

In detail tell us how the system was converted to R134a?

When compressor was changed. What was the procedure for replacement, in detail?


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chris142 on Mon September 19, 2011 11:26 PM User is offline

Make sure that your heater valve isn't adding heat to the AC.

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