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same answer on any car. really, only parts moved about to fool me.
all fuses good. ,including AC (grin)
blower in dash must at least work FULL speed blow.? does it?
sure AC weak on high, sure, because it is. (physics)
if the blower fails dead only on one speed say so....???????
or not using RECIRC mode. (way batter try it first)
next i,s hood up. (bonnet in UK) see large compressor AC
see clutch in front, see pulley and clutch all turn as one piece AC on.
if all that seems ok
get a shop to add R134a Refrigerant carefully , if found to be low.
Check the AC fan relay
Symptoms Of A Defective Blower Motor Relay
The blower motor relay's job is to basically bypass the current that passes thru' blower motor resistor and deliver it directly to the blower motor. With the blower motor getting full battery current, it'll run in HI speed.
The most common symptom you'll see, when the blower motor relay fails in your Chevy S10 (GMC S15), is that the blower motor will not run in HI speed (but will run in LO, M1, and M2 speeds).
In some cases, the blower motor will fail and the blower motor will not run in HI but you'll have all of the other speeds working.
You have two choices. Choice one take vehicle to a AC repair shop. Choice two get a AC leak detection kit and do it yourself. The kit works by adding a dye to the system and where the leak is it will glow green which can be seen using special glasses. You can also get AC freon with the dye in it
first I would look under the hood with the a/c on to see if the compressor clutch is working, if not it could be a simple fix by adding refrigerant, if you have a leak then, you need to take it in and have a test performed on it, most shops have a dye that they put in to see where the leak is
When you say the ac is not working, do you mean the blower or the compressor is not engaging. If the compressor is not engaging, the system is low on refrigerant and needs to be checked for leaks and recharged. If the blower is not working, it will most likely be the resistors in the multiple speed switch.
You need to have it leak tested and recharged. There's a low pressure switch that won't alow the compressor clutch to engage when there's a leak. If the compressor clutch was engaged without refrigerant and oil circulating it would seize. Don't be surprised if you need a new condenser. Don't use those leak sealer recharge kits as they can do more harm than good, and some AC shops won't touch a car after someone uses leak sealer. They claim there's a different mix of gases in the refrigerant (usually propane) and they can't recycle it, and they don't like customers complaining when the AC doesn't work when it was the leak sealer clogging things up.
check the fuse in the fan-fan relay-check voltage at the terminals of the blower if you have the voltage problem is to check the blower motor of the blower speed control
a) Air blows but is not cool.
If this is the case, suspect refrigerant leak. Do not operate AC untill it is checked fully. Operating AC with freon leak may lead to compressor failure and expensive replacement.
b) No air blows at all.
If this is the case, suspect blown fuse or burned blower motor. Sometimes is just a fuse or may have a malfunctioning resistor (blower motor works only at full speed).
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