Details; 118000km, highway driven, auto,
air conditioning works well when temp is below 72 degrees but when outside temp gets hot the compressor will not activate and yet the green light on the AC button is ON. I have tried different vent settings with no change.
I have never had the AC checked as it has worked well. Before i take it to a dealer what questions should i be asking. What can i expect the mechanic will do? Is there any visual checks i can take before being soaked for repairs. Are the kits any good?
Thanks in advance
You can buy 134 refrigerant and an install kit with instructions at any auto parts store for about $20 total. If you don't have a leak.. Your done. Otherwise you will have to have an expert fix it, Good Luck.
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Hard to say. Under normal conditions, vent temp should be about 20 or 25 degrees less than outside air temp. So if outside air temp is 90 degrees and the engine is at idle speed, vent temp would be around 65 or 70. On the road the vent temp could be less than 60 degrees. If outside air temp is 70 degrees vent temp will be around 40 - 50.
Here's the way I usually approach problems such as this. First I'll hook up a scan tool that allows me to see the actual engine coolant temperature is [not just what the gauge says] as the vehicle is being driven down the road at highway speeds. The coolant should be near the 192 - 200 degree range to get the best heat out of the heater. If the coolant temp is below that level then the amount of heat you'll get will drop according. IF the coolant is reaching full temp but the air coming from the heater isn't very warm then you could have a restricted heater core or a temp control door in the ductwork that isn't working properly and is allowing cold air to sneak past the heater core. Usually if you have a water pump impeller problem you'll also have an overheating problem as the pump often isn't able to move enough water through the radiator to keep the engine cool. Hope this gives you a starting point and good luck!
A/C is all conditional upon ambient air temperature. If you are in a high heat area and getting 58 degrees fah., you are doing great. Take it on the highway and see how much further it goes down. The temp. inside is all relative to the outside temp.. That is the science of it. Let me know what your guage readings are and the temp where you are and I can tell you if you are doing good or great.
That is why the A/C clutch is not coming on.If the temp is below 50 degrees the auto control will not allow the compressor to kick in to protect the compressor.You have to check the codes for the body control module.It should show a code for the outside temp sensor.You could have a bad sensor or wiring.If you disconnect it it should show -40 degrees.check wiring and connections.Hope this helps.Good luck.
When your engine thermostat has failed or is sticking open, the engine fluid isn't able to reach a temperature that lets your heater core get hot enough to produce worthwhile heat to blow into the passenger's compartment. It is also not good for your engine to run below design temperature.
If you have a dashboard temp gauge, if your thermostat is stuck open, that gauge will probably stay in the cold area.
I would think that that is the problem, and I would have the thermostat changed (not a very difficult or expensive job).
Hope this helps you.
my 06 jetta did the thing. I fixed it by replacing the outside temp sensor. Turns out the air only works if temps are over 45 degrees. My outside temp sensor had gone bad. sensor was around $11.00 and I had to re-wwire it in because the original one had corroded. air has been working great sense.