Blower speed

[04 Quicksilver]

When I use AC on automatic function the blower speed has recently become erratic. What do y'all think? TIA
BW

[Chico Baravelli]

Belt or exhaust drive? Does engine RPM or exhaust tone also change? What happens when AC switches off? First guess: PCM is not adapting or attempts to but is off the map.

[MyBlackBeasts]

When I use AC on automatic function the blower speed has recently become erratic. What do y'all think? TIA
BW

Supercharger blower or HVAC blower?

TIA? transient ischemic attack?

[justbob]

BCM on its way out?


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[04 Quicksilver]

It's the HVAC blower. What's involved in investigating and replacing BCM?

[RubberCtyRauder]

https://www.mercurymarauder.net/forums/showthread.php?48707-BCM-Installation-(Fan-Blower-Control-Module)-Pics

[04 Quicksilver]

https://www.mercurymarauder.net/forums/showthread.php?48707-BCM-Installation-(Fan-Blower-Control-Module)-Pics

Thank you, sir. Looks to be beyond my mechanical skills. Will get in touch with my technician.

[Turbov6Bryan]

Neil that used to work at Firestone opened a shop in Lenexa Kansas

autopia llc http://www.autopiakc.com/

[04 Quicksilver]

Neil that used to work at Firestone opened a shop in Lenexa Kansas

autopia llc http://www.autopiakc.com/
Thanks for the info.

[the fat bastid]

Supercharger blower or HVAC blower?

TIA? transient ischemic attack?

haha. Thanks In Advance

[04 Quicksilver]

Problem(s) solved. BCM replaced; right front window stopped, window regulator replaced; intake manifold gasket replaced. Tech said module was a little rough but he did not have to remove any hoses. Parts $202, labor $315. I already had the gasket. Great customer service. The guy's a wizard!

[cpe6]

I took the car out last week and tried to turn the A/C on and nothing happened; blower motor didn't come on at all; what could possibly be the problem? I have heard blower motor or resistor..

[BLACKMARAUDER04]

It was probably your BCM (Blower Control Module). When they get really hot, the solder joints melt and the unit fails.
My black is on its third, My silver is still on its original.
I sent out my extra BCM ( I keep one on hand) to fastblackmerc (https://www.mercurymarauder.net/forums/member.php?1670-fastblackmerc). He will fix the solder joints so the new unit once installed,
will not fail. Also check your fuse.

[Turbov6Bryan]

Just check the blower 2 wires. If it has power and ground and not working, then the blower motor needs replaced.
if there is no power and ground then BCM or fuse

[04 Quicksilver]

Thanks to Jim for repairing my original BCM which I will have for a spare.

[fastblackmerc]

I took the car out last week and tried to turn the A/C on and nothing happened; blower motor didn't come on at all; what could possibly be the problem? I have heard blower motor or resistor..

It's usually the BCM. Due to environmental concerns, the solder in the BCM has no lead, which caused brittle joints. That is why it may work for awhile after you tap it. I repair them with high content lead solder and add an extra connection for reliability.

[cpe6]

Now thats one problem; it didnt turn on after I tapped it. problem number 2; the procharger belt has slipped for the second time; theres no one local to have it repaired due to my limited time and inexperience with replacing a belt with this setup. I dont see the logic of returning the car to Marty O just to replace the belt.

[USN_Lifer]

Looking through old threads to confirm my issue is the same. The HVAC fan/blower speeds change spontaneously from low to very high back to low. Is that the BCM going out????