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Old 26th October 2008, 06:13   #1
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Default Overheating when AC on

My M800 overheats when I use AC. Without AC it runs perfect. No overheating at all.

Can anyone help me to find the solution?

Thanks in advance.
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Old 26th October 2008, 11:01   #2
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get the radiator cleaned
remove the radiator valve during summer
check the radiator fan whether it is running while ac is on
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Old 26th October 2008, 11:18   #3
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Quote:
Originally Posted by harry2223 View Post
get the radiator cleaned
remove the radiator valve during summer
check the radiator fan whether it is running while ac is on
Bhai, If u remove the radiator valve, the coolant will flow continiously without any concern for maintaining a constant working engine temperature.Will lower the efficiency of the engine if the working temperature is not maintained.
If the valve is faulty, get it replaced with a new one but dont remove the entire thing out.
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Old 26th October 2008, 23:23   #4
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DarkEraser, is the air-con an after-market fitment? If so, you need to upgrade your cooling fan.
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Old 27th October 2008, 00:12   #5
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Tomorrow, I will check and update you all.

Thanks.
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Old 27th October 2008, 14:17   #6
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800 always have an issue with cooling, check the A/c Gas,Clean the radiator with air/ water,Thermostat, last option is the bearing for A/c compressor.
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Old 27th October 2008, 14:28   #7
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Quote:
Originally Posted by DarkEraser View Post
My M800 overheats when I use AC. Without AC it runs perfect. No overheating at all.

Can anyone help me to find the solution?

Thanks in advance.
would like to know if you use coolant to top up when the radiator / reservoir is low. many people top up with water. Result is when car is driven without AC there is no temperature rise but when AC is switched on the temperature rises significantly.

Also as suggested see if the AC fan is switches when ac is on. and also as GTO has said.

Last edited by Jr Godzilla : 27th October 2008 at 14:29.
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Old 27th October 2008, 20:46   #8
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Update:

Fan in front of Radiator is working fine. When AC starts, Fan starts rotating and vice versa.

There is coolant + water in radiator and reservoir. I always top up both. In past, I had used 100% water in radiator with AC on and never encounter such problem.

Recently I added coolent without flushing radiator. Because at that time I had no idea how to flush the radiator. But I removed all coolant+water from the reservoir using pipe and then added coolant + water. I guess, radiator flush may solve this problem.

If possible, tomorrow I will show my car to some local mechanic; as I am not a technical person to check radiator valve etc.

Thanks!
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