My fans are coming on soon after a cold start and won't turn off. The idle is about 2,000rpm and I believe this is related to the fan problem. All sensors are new and fan relays are about 1 year old. I read that a corroded wire in the loom near the center relay could be at fault. Has anyone ever had a similar problem?
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the idle up solenoid may be disconnected it is usually a vaccume hose that detects extra load when ac is on and slightly raises idle . however the over heating issue is a concern . check that the radiator has coolant and all air is blead from the coolant system, check that the electric cooling fans are operational and they should come on regardless of the eng temp if ac is on. if fans are not working check coolant fan fuses
Start by checking to make sure that the a/c condensor and radiator is not full off debris. If the condensor and radiator were full of debris it will limit the air flow from the engine cooling fan which in tern will cause a high discharge pressure on the discharge on the a/c causing poor or no cooling at idle and could also cause vehicle to overheat. Check and make sure that the cooling fan as well as the condensor fan are coming on together when the a/c is turned on if equipped with 2 fans.
I passed this question the first time I read it, so I will take a stab at it now. The fans don't come on until the compressor has pumped the freon pressure up to say 150 or 200 psi. And the compressor clutch has to have voltage to engage the clutch. I wonder if the clutch is going and needs 14 volts instead of 12 to engage ? Or the relay that powers the clutch ? Speeding up the engine would increase voltage from the alternator. This is assuming the serpentine belt is tight and everything else is working correctly. I think I would swap the relay with another and put a meter on that circuit to the ac clutch to see what it takes to engage it.
Make sure the cooling fan on the condensor is working in other words the fan on the radiator should come on as soon as AC is turned on another problem is dead bugs so try hosing the rad from the front of the car to wash them out and any dust and muck as well as if this rad isnt cooling the high pressure gas then it will not get cold .
have you disconected or changed the battery lately- the idle needs to be reset.
my 89 regal had to be started cold -put in drive with your foot on the brake - then wait untill radiator fan turns on (open the hood first to be able to hear the electric fan kick on :)
this somehow set the warm idle speed and the problem was gone :)
The car may be hard to start because it may need a normal tune-up. If the spark plugs are pretty used, they will slowly stop burning as much fuel because the spark slowly gets lesser and lesser. On a cold day the fuel is harder to ignite with a small amount of spark.
Normal idle when its cold means that your cars idle is probably too high. If you lower the idle, the choke on a cold day will keep the idle a little higher until the motor warms and then it will kick back off. If the idle is too high, it will run very rich, smothering itself with fuel, and causing the idle to stay low. When the car warms, its creating better spark when its warm, and with the idle being too high its running at a fast idle.
The car wont start sometimes can be the cause of a few things. If the ground is bad on the fuel pump, it wont make a good connection sometimes for when you turn the key on, the fuel pump dont pump the fuel to the engine. Another one can be that your accessory switch can be loose going to the fuel pump. I think its your ground though. Good luck! Hope this helps.
Have a nice day.
that seems to be the problem. If the fan does not turn on when the a/c is turned on it could be a fuse, relay, control box, or just a bad fan. Try connecting the fan directly to see if it works. Does this car have 2 fans? normally all the small cars have 2 fans one for the engine cooling and one to assist the first when the a/c is turned on. Without the fan pulling air through the a/c condensor the had pressure goes up high enough to shut off the a/c compressor. It also causes some cars to run warmer than usual when stopped. Check the a/c condensor for blockage also which doesn't have anything to do with your fan not working.