Took to subaru dealer, replaced high pressure a/c hoses to compressor;($420.)worked for 2 days now still blowing hot air? hate to replace things cause no one can fix?? serv. mgr said sometimes when replacing one hose once fixed can cause others to blow? truth ??not sure how many hoses there are for air conditiong.
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Re: 2000 forester air conditioner blowing hot air
Replacing a hose does not cause another to blow. It does allow the system to function and show you where other things are worn out. There are not that many hoses in an AC system unless the Forester is pooly designed...... If you suspect more bad hoses, buy and replace them yourself, IF the system has no freon in it!!!! You aren't allowed to just dump the freon into the air, that is illegal, but if it leak out because the dealer did a poor job repairing the system (didn't check for other bad hoses or leaks) then there is no foul. Once you break the system's integrity, do not leave it open to the air very long as this will let contaminants get into the lines. Buy everything you want to replace and do it all in one day. Once you have everything installed, then you can take it to someone for a vacuum down, leak check and recharge. You will probably have to replace the filter/dryer (unless the dealer already has, for that $420 he should have). You can check at any good auto parts store and they will tell you how many hoses there are in the system. Metal ones do not need to be repalced unless they are kinked or worn through.
Before starting on this, make sure the parts the dealer put on are not at fault, that's his job and his cost, not yours.
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If the engine was stopped or you shut it down immediately then the possibility of damage would be remote as the piston would not be continuing to move which is where most damage occurs.. If the radiator failed a pressure test then the problem is that the radiator pressure was not high enough to prevent the boil. I will explain . Water boils at 100degrees c at 14psi (air pressure). When under pressure the boiling point goes up to well above the 100 degrees . If you have a coolant system leak the pressure will be at air pressure and when the engine is stopped the hot parts have not water circulation so the temperature goes well over the 100 degrees and so it blows off . 2 problems are present that you have to correct. Find the leak and have it fixed and secondly check that the cooling fans are working correctly. Caps come in varied pressure ratings for the radiator construction so check that the cap reading is suitable for you vehicle
A mechanic would check the system with a set of pressure gauges. If the compressor is running, the low side would read around 30psi and the high side would be around 250psi. That is how you know if the system is full of freon or not. You may have to get a professional diagnosis to proceed. If you replace the compressor, the accumulator needs to be replaced and a vac pump is used to pull all of the air out before the freon is added.
I highly recommend that you get it checked by a professional. You may have a restriction in your system, or the system is way overcharged. In either of these cases, the possibility of high pressure causing lines or hoses to burst and possible severe damage to your vehicle, like a destroyed compressor, is very likely.
Also, check the can that you added freon from. Many of the small cans of freon sold at the local parts retailers have several ounces of "oil charge" in them. Many times, when these cans are used to fill the system, the system ends up saturated with too much oil, which can also cause dangerously high head pressures, which can result in severe damage to your vehicle. In these cases, the system must be evacuated and flushed out to reduce the amount of oil in the system before it will cool properly.
It could be that there was more than one leak and the dealer found only one. The AC system has two pressure switches to protect the compressor from damage---a low press. switch cuts off the compressor when there is not enough refrigerant in the system, the high switch cuts off when pressures get so high they could blow out the seals. Both are a result of a leak--refrigerant leaks out and air can leak in. Air will compress and when it does, it gets hot--so no cooling, and pressures go way up. So the compressor may have been stopped by those protective switches.
Of course, there could be a bad relay or other circuit malfunction.
Another possibility is that the compressor sat too long before being repaired (but we are talking about weeks going by here, not days). The air and moisture (humidity) that leaks into the system during this time creates acids that will attack the metal reed valves in the compressor. On restart, the damaged metal valves eat themselves in short order. If this is the case, the compressor ran until it seized and will need to be replaced. This particular problem is impossible to diagnose. So the dealer may have done his best.
check the coolant pressure on the LOW pressure service port (where you put freon in). it sounds like your a/c was overcharged, and if so, you probably need another new compressor AND a new condensor. they sell gauges for checking this at autozone for 10-20 bucks each.......