3 loud pops when turning on igniton

[Bullitt]

A few years ago as I was assembling my car after a frame off restoration, I turned on the ignition and heard a loud pop coming from the front. This happened 2 more times when I turned on the igniton later.
My car was almost finished in the interior, everything connected. Any idea what it could be?

I later had a problem where the AC stopped working due to a bad connection to the AC diodes which broke my low pressure switch.
I don't know how long the AC diode was disconnected, or if it was disconnected at this time (I would guess so, but then again I don't know how long the low pressure switch would last like this)

I suspect some diodes to the fans or something, but that is probably just two.
If i remember correct the diodes for the blower motor was okay!
As far as I know everything works.
The blower motor is a little noisey and I'm not exactly blown away from the air coming out of the vents, but other than that, it is Ok!

[Bitsyncmaster]

Capacitors will make a loud pop when they blow apart. There are no diodes feeding fan motors because that would creat a lot of heat in the diode and a voltage drop.

[Bullitt]

Okay!

Pardon my french, maybe that was what I meant!

Any capacitors come to mind?

[Bitsyncmaster]

There is one capacitor for each cooling fan in the harness near the fans.

[Bullitt]

What is their purpose? (As both fans work)

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[Bitsyncmaster]

What is their purpose? (As both fans work)

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For AM radio noise. I removed my capacitors.

[Bullitt]

Any thoughts on what would have caused it? I have DPNW fans and aftermarket cd/Bluetooth player if it matters.

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[Bitsyncmaster]

Any thoughts on what would have caused it? I have DPNW fans and aftermarket cd/Bluetooth player if it matters.

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It may not be the capacitors that made the noise. But if so, you got a high voltage glitch on the fan circuit.