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1989 Nissan Truck A/C Problems

I have a 1989 Nissan truck, 4 speed, 2.4 liter. It runs good but has developed a weak air conditioner. For a few weeks it was weeping or dripping a/c condensate water on the rubber mat on the passenger side on the floor inside. I looked several times to see if there was a quick fix but saw nothing. Today, the A/C went down to almost no cooling. It forced me to park it around in the sun (way over 100 degrees) and line up some sunlight into that area under the dash, to be able to see. I saw a rubber hose inside and below the dash had come loose, it was dripping water. I stuck the hose (end) back on and I could see that it was intended to drain or circulate that water into the fan area (to apparently cool the fan?). Anyway, now it runs and it cools a little. It makes no noise. The fan appears to work.

What probably "went out" on my truck a/c? Did I burn up the condenser? Or, would it recharge and be okay?

Another couple questions. This old truck is in real good shape and I'd like to keep this a/c as it is --not forcibly upgrade it to politically correct (bad) refrigerant. When I take it in for service, how do I avoid having them put in that new (bad) refrigerant? For instance, if they change the condenser, I want them to replace and recharge it with the old style refrigerant. Thanks anyone for ideas and suggestions.

Reply to
ScooterNDevon
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ScooterNDevon wrote:

Look under the dash on the passenger side near the center of the truck. Is there a rubber hose running from the heater plenum through the firewall? If so, pull it off the plenum. Have a small bucket handy.

Here is a response to a related problem I posted back in Nov 03. I have a 97 pickup.

I noticed a strange rubbing noise in the right front only when making a left turn. It sounded like it was the right front tire rubbing against a loose inner splash shield in the fender when the wheel turned to the left. Upon inspection, I could not find anything wrong up there. I had planned to take the truck to my mechanic to find the source of the noise later in the week. A day or so later, I picked up a box containing something I had bought and had left on the passenger side floor overnight. I noticed that the box was soaking wet on the bottom half. I then felt the floor mats and they were drenched. Having had this problem in other cars that I have owned, I assumed that it was a clogged drain hose. I looked under the dash and saw water slow dripping from the air plenum. I pulled the drain hose that runs from the plenum through the firewall and water poured out of it. I cleaned the coagulated debris out of the drain hose and replaced it. I also pulled the other rubber hose that ran between the air plenum and the blower motor under the dash and about a pint of water ran out of that hose. That rubbing noise disappeared after that. I assume it was shloshing water in the blower motor that was making the noise when I turned left. I had to leave the passenger side rug propped up for about a week so it could dry out in the summer heat. I expect that I might have some problems in the future with that blower motor after its having been wet.

Reply to
Bill Schnakenberg

The A/C drain on the evap is plugged with trash.

NO!!!! There is a hose from the blower housing to the fan motor to send AIR to the motor to cool it. If water is in that hose it isn't suposed to be and will ruin the motor in short order!!!

Reply to
Steve T

Thanks everyone for the help. I drained the water out of it, and it works a lot better.

Reply to
ScooterNDevon

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