a\c killing motor
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a\c killing motor
Have a 1989 f-250, when pulling up to a stop sign or just pushing in the clutch to shift down with the ac on it kills the motor. You turn it on and it runs just fine. You start it up just setting in the yard it will run just fine but take it on the road and it will kill it. what could be doing this, the ac is fully charged.
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Joined: Jul 2002
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From: Alice USA
a\c killing motor
Sounds like a short to me I have never heard of a overcharged ac that could kill the eng. maybe burn the belts off or fry the comp. but never have I heard of one killing the motor
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From: suburban atlanta
a\c killing motor
[updated:LAST EDITED ON 08-Jul-02 AT 10:46 AM (EST)]Check the IAC for being dirty. The IAC idle air control could be gummed up, causing it to respond slowly to the added load of A/C at idle. Driving down the road, or at stable idle, the IAC just sits still. Coming to a stop, it has to WORK a little to stabilize the idle. Worth a check, cheap, and may make it run better too... Could also be the wire from the A/C clutch to the ECM is loose, and thus not telling the ECM that the A/C is engaged.
tom
tom
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Joined: Jun 2002
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From: Tucson USA
a\c killing motor
This a post from alt.Trucks.Ford. I have not checked into it yet.
I've got the exact same problem with my '85 Bronco II. The fault with mine is a broken vacume line going from a solenoid on the fenderwell to something labeled "A/C L DV" on the emissions sticker. An ASE mechanic tells me this is a gizmo that tells the fast idle solenoid to bump the idle speed up when the A/C is running. You might want to look at that line and make sure it's in good shape, i.e. connected, no vacume leaks. According to one reference manual (the computer based one my mechanic friend has) it should be mounted on the firewall, just to the driver's side of the A/C evaporator. If the
line is fine your next step would be to check the "A/C L DV" and the
solenoid. If you find the "A/C L DV" I'd love to have a photo of it via e-mail as I can't find it and mine may be missing.
On 8-Aug-2002, "Mescal" <mhollandsprint at earthlink.net> wrote:
My daughter has been having trouble with the '85 F150 she drives.
Sometimes while sitting stopped at traffic lights with the AC on, the engine idle will drop to about 500 rpm and then stall upon acceleration. When the AC is turned off she notices a marked increase in power and the stalling ceases. She had the AC looked at and it was not even low on freon. Can anyone suggest a fix or help with a diagnosis?
I've got the exact same problem with my '85 Bronco II. The fault with mine is a broken vacume line going from a solenoid on the fenderwell to something labeled "A/C L DV" on the emissions sticker. An ASE mechanic tells me this is a gizmo that tells the fast idle solenoid to bump the idle speed up when the A/C is running. You might want to look at that line and make sure it's in good shape, i.e. connected, no vacume leaks. According to one reference manual (the computer based one my mechanic friend has) it should be mounted on the firewall, just to the driver's side of the A/C evaporator. If the
line is fine your next step would be to check the "A/C L DV" and the
solenoid. If you find the "A/C L DV" I'd love to have a photo of it via e-mail as I can't find it and mine may be missing.
On 8-Aug-2002, "Mescal" <mhollandsprint at earthlink.net> wrote:
My daughter has been having trouble with the '85 F150 she drives.
Sometimes while sitting stopped at traffic lights with the AC on, the engine idle will drop to about 500 rpm and then stall upon acceleration. When the AC is turned off she notices a marked increase in power and the stalling ceases. She had the AC looked at and it was not even low on freon. Can anyone suggest a fix or help with a diagnosis?
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