I would suspect that the relay for the clutch is stuck in the ON position. The relay is located in the engine compartment, to the left of the driver side hinge box. There are two relays there, the one with the ORANGE wires id for the fuel pump, the other one is for the A/C clutch. Disconnect the plug to the relay and please report back.
I disconnected the relay you suggested, but the AC still turns on. I even disconnected the other relay just for giggles. The same result. Any other suggestions?
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Originally posted by olejoedad:
I would suspect that the relay for the clutch is stuck in the ON position. The relay is located in the engine compartment, to the left of the driver side hinge box. There are two relays there, the one with the ORANGE wires id for the fuel pump, the other one is for the A/C clutch. Disconnect the plug to the relay and please report back.
So it blows cold air all the time? Do you hear the compressor clutch engage and disengage? (Clicking sound and engine rpm pulls down and then recovers)
Update.... After reconnecting and disconnecting the relays a few times.... The AC no longer blows cold air. However as soon as I turn the ignition key in the "on position" but with the engine off....i hear a motor sound(underneath the dash or in the front hood compartment) kick in. It stays on and i can feel air passing thru and under the dash. I check the front compartment and see that the radiator fan is on, but what else could be blowing the air?
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Originally posted by olejoedad:
So it blows cold air all the time? Do you hear the compressor clutch engage and disengage? (Clicking sound and engine rpm pulls down and then recovers)
...as soon as I turn the ignition key in the "on position" but with the engine off....i hear a motor sound(underneath the dash or in the front hood compartment) kick in. It stays on and i can feel air passing thru and under the dash. I check the front compartment and see that the radiator fan is on, but what else could be blowing the air?
There's a blower of course for the heater and A/C... but as long as the OFF button has been pushed in all the way, there should be no fan blowing anywhere. (The rad fan should only turn on if the coolant temp has reached 235°F.)
The OFF button is pushed in all the way. Motor still kicks in. How do I disconnect the blower motor?
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Originally posted by Patrick:
There's a blower of course for the heater and A/C... but as long as the OFF button has been pushed in all the way, there should be no fan blowing anywhere. (The rad fan should only turn on if the coolant temp has reached 235°F.)
Issue resolved. Thanks to olejoedad and patrick for the suggestions. Found that the radiator fan and poorly insulated cabin was the culprit. The radiator fan was blowing air into the cabin. I disconnected the radiator fan to find the issue. However....I do hear a low fan noise in the engine compartment when the key is on but engine is off. Amy ideas?
I disconnected the radiator fan to find the issue. However....I do hear a low fan noise in the engine compartment when the key is on but engine is off.
This is why it's helpful to supply a few details about your Fiero. Yes, it's an '87... but what engine does it have? I'll have to assume it's a 2.8 V6... in which case you must be hearing the trunk blower. It's on the same circuit as your rad fan. You'll need to determine why that circuit is live when the engine is cold. Detach the single wire from the fan switch on the engine and see if the trunk blower stops.
This is why it's helpful to supply a few details about your Fiero. Yes, it's an '87... but what engine does it have? I'll have to assume it's a 2.8 V6... in which case you must be hearing the trunk blower. It's on the same circuit as your rad fan. You'll need to determine why that circuit is live when the engine is cold. Detach the single wire from the fan switch on the engine and see if the trunk blower stops.
Patrick, correct me if I'm wrong but 87 2.8's did not have a blower fan in the trunk, only the 86, and maybe prior. My 87 GT did not have a blower fan but the 86 GT did..
I stand corrected... I pulled the engine, front crossmember, and refreshed entire suspension on my old 87GT and never pulled back the trunk carpet to notice the fan... Just looked up the fan...87 2.8's had them indeed....
Found that the radiator fan and poorly insulated cabin was the culprit. The radiator fan was blowing air into the cabin. I disconnected the radiator fan to find the issue.
I think it would be interesting to post of picture of your front trunk area as I'm really confused on how the rad fan was blowing a very noticeable amount of cold air into the main cabin. Also wouldn't it start being warm air when the engine got to temp?
As far as your radiator fan turning on with the ignition that will happen if someone installed new switches on the AC compressor and grounded them, which is what the instructions tell you to do. I forgot, the last time I installed new switches and now my fan is on all of the time with the ignition on. I need to clip the ground wires going to them.
Thanks for the info. I personally prefer to always have the fan on.
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Originally posted by TXGOOD:
As far as your radiator fan turning on with the ignition that will happen if someone installed new switches on the AC compressor and grounded them, which is what the instructions tell you to do. I forgot, the last time I installed new switches and now my fan is on all of the time with the ignition on. I need to clip the ground wires going to them.
The previous owner did some modification to the trunk area when building the replica. Note sure how to upload pics on this forum?
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Originally posted by da.slyboy:
I think it would be interesting to post of picture of your front trunk area as I'm really confused on how the rad fan was blowing a very noticeable amount of cold air into the main cabin. Also wouldn't it start being warm air when the engine got to temp?
Yes, it's an '87... but what engine does it have? I'll have to assume it's a 2.8 V6... in which case you must be hearing the trunk blower. It's on the same circuit as your rad fan. You'll need to determine why that circuit is live when the engine is cold. Detach the single wire from the fan switch on the engine and see if the trunk blower stops.
