2.4types2003 said:
the air conditioning doesn't work. when pressed it causes the car to judder and a loud grinding noise to come from the air conditioning unit so i ***ume that this is broken. however does this explain why the car is blowing got constantly as I didn't think that it had anything to do with the general controls of the car. when it is set on low it still blows hot air out and when put on high it then blows out even hotter this is literally the only thing left on the car to then complete and i go away in less than a week and need it ready. is there a list of fuses and relays as well as locations as to where parts on the car for the heater system is so i can distinguish the true cause to the issue thanks.
well there are two things involved in the air-conditioning
1. a cold source - this is the compressor (which is driven by the auxiliary belt), the condenser (aka aircon radiator, in front of the engine radiator)), the evaporator (which is in the heater core, and is the actual cold source), and the refrigerant (which is in the piping, compressed by the compressor, and expanded in the evaporator).
2. a hot source - this is the "heater matrix" (which is in the heater core)
Both of these are used during control of the temperature in the passenger compartment, each source is either on or off
With the A/C set to OFF the compressor will not run, so there is no cold source
With the A/C set to ON (or AUTO), the compressor will run, and this is probably the "loud grinding noise"
With the target temperature set to LO the heater matrix should be OFF, at most other target temperature settings the heater matrix will be ON.
2.4types2003 said:
could you if possible send me a list of things to check before actually replacing any parts and also after the list of things to check could you show me a list of all the components that work the heater and if possible the locations so i can speed up the process it would be amazing if you could do that thank you
Easiest thing to check is the operation of the heater matrix.
With target temperature set to HI the valve should be as in the picture below (it's on the bulkhead at the back of the engine)
With target temperature set to LO the valve should be as in the picture below
If that valve does not shut, that is
one of the problems.
Next you need to check the operation of the A/C
I'm ***uming that the "loud grinding noise" is the compressor, and if it really is making a "loud grinding noise" then I suspect that the compressor is knackered.
IIRC your car does not have built-in satnav so the A/C controls are manual buttons.
With Auto ON, does the "loud grinding noise" go off when you turn the A/C OFF using the A/C button, and does the "loud grinding noise" come back on when you turn the A/C ON using the A/C button ?
If yes, then the compressor is being turned on and off by the system, so next thing is to check if the A/C is working properly. There are two typical reasons why the evaporator is not behaving as a "cold source"
A. low refrigerant pressure
B. perished consenser
Since the engine compartment was submerged in water, it's possible that the condenser is clogged or perished. You can visually check the condition of the condenser, read this
http://typeaccord.co.uk/forum/topic/21792-air-con/?p=230334 and this
http://typeaccord.co.uk/forum/topic/21792-air-con/?p=230348
If the condenser looks ok, then the system may have lost some of the gas, and/or the compressor is knackered.
There is also a built-in diagnostic, read this
http://typeaccord.co.uk/forum/topic/21770-blowing-hot-and-cold-air/?p=230336
Using that diagnostic you can check the state of all the sensors involved in the operation of the A/C system. If all the sensors work ok and sensor 5 (evaporator temperature) is not cold, then either the refrigerant needs re-gassing, or the condenser is perished, or the compressor is knackered.
edit: just one other thing to check, has the pollen filter been replaced (as that would have been submerged in water) ?