Question about Cars & Trucks
My mazda 5 air con isn't blowing cold air. took it to local garage who plugged it in to a computer. They said it was a problem with the sunsensor. They said they had never come across this and couldn't fix it. what is the likely solution?
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Posted on Jan 02, 2017
SOURCE: 99 oldsmobile intrigue
The ambient temperature sensor going bad causes this exact problem. I've replaced many of them because when they show outside temp as being below 60 degrees, the A/C control module will shut the compressor off.
Posted on Aug 08, 2008
to hear things like this really bugs me why would any mechanic replace a parts not knowing that is the problem and call them self a mechanic. Going to give you the best run down as I can think of, and at least we know now you have a new compressor and we can leave that out as the problem.
1 check for leaks, If no pressure your compressor will not run. a dye can be added when charged the
system to see any leaks may exist by using black light.
2 check pressure switch & pressostat making sure is not faulty, if it faulty, the switch will not sense
any pressure to kick the compressor on.
3. check AC fuse, making sure is not blown, if blown no power to ac switch
4. check AC relay, making sure is good relay, bad relay compressor will not work or kick on.
5. Make sure your have no moisture or air in the system, system will not operate up to 100% if any
of those items exist in the system, best way to charged the system is to vacum the system out
first removing any moister and air in the systems, keep in mind, air is 02 can convert into
moister/water molecules if its cold enough.
6. expansion valve faulty, this unit usually goes out like compressor do. it sense the temperature,
regulate refrigerant flow to evaporator. everything may run and operate correctly, if this unit goes
bad it will restrict refrigerant flow cycle and evaporator will not get cold.
I would replace number 6, eventhough if its not bad, it need to be place regardless because of the year of your vechicle, cost 5 bucks. Note: My guess, when you push the ac button do you hear the compressor kick on, if not my guess would be 1 and 2. replace.. If your compressor is running than it would be no. 6 and make sure you have lots of feon in the systems. good luck, hope that help some.
Posted on Jul 11, 2009
Ensure the compressor engages when the AC is turned "ON" Open the hood, start engine with AC OFF" stay at the engine, and have some one else to turn AC "ON" full cvold you should here a clicking sound and the RPM of the engine may drop slightly, if not the AC is not working, could be a fuse .
Posted on Aug 11, 2009
check the mas air flow sensor(is this the 6 cyl) the sensor has a problem with the nose piece inside not moving enough to tell the ecm the propper air flow for the cold start,also check throttle valve for dirt build up around it-if its a four cyl repost
Posted on Oct 05, 2009
its the heater motor brushes....101% guarantee it.
They can be bought on ebay for £12.50
Posted on Feb 01, 2010
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