PDA

View Full Version : Electrical 3 loud pops when turning on igniton



Bullitt
09-11-2020, 07:01 AM
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
09-11-2020, 07:55 AM
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
09-11-2020, 08:19 AM
Okay!

Pardon my french, maybe that was what I meant! :hmm:

Any capacitors come to mind?

Bitsyncmaster
09-11-2020, 08:55 AM
There is one capacitor for each cooling fan in the harness near the fans.

Bullitt
09-11-2020, 10:01 AM
What is their purpose? (As both fans work)

Sent fra min J9210 via Tapatalk

Bitsyncmaster
09-11-2020, 10:05 AM
What is their purpose? (As both fans work)

Sent fra min J9210 via Tapatalk

For AM radio noise. I removed my capacitors.

Bullitt
09-11-2020, 10:08 AM
Any thoughts on what would have caused it? I have DPNW fans and aftermarket cd/Bluetooth player if it matters.

Sent fra min J9210 via Tapatalk

Bitsyncmaster
09-11-2020, 10:10 AM
Any thoughts on what would have caused it? I have DPNW fans and aftermarket cd/Bluetooth player if it matters.

Sent fra min J9210 via Tapatalk

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