Facelift Blower Fan Resistor/Regulator Replacement

[nocfn]

I have removed my Hella fan (installed last year) so that I might replace the Regulator. Should I decide to use the existing hunk of aluminum alloy and just screw the new setup into it, will I need to apply fresh heat sink paste?

Second question I have is how does one actually remove the lower section so that I can easily remove existing aluminum alloy heat dissipation unit and use the one that came with the resistor/regulator?

 

[nocfn]

Has nobody replaced a regulator on a facelift HVAC system?

 

[gsxr]

I have removed my Hella fan (installed last year) so that I might replace the Regulator. Should I decide to use the existing hunk of aluminum alloy and just screw the new setup into it, will I need to apply fresh heat sink paste?

The one time I did this, many years ago, I removed the regulator from the heat sink and left the existing heat sink in place. This was easy (and not possible with the older design on 86-93 models). A dab of fresh heat sink paste would be a good idea, and would be required if the old paste is either missing or dried out / crumbling.

Second question I have is how does one actually remove the lower section so that I can easily remove existing aluminum alloy heat dissipation unit and use the one that came with the resistor/regulator?

I'm not sure - can't recall if I've ever done this on a 94-95. Should be 3 screws on top holding it in place.

 

[nocfn]

That is a fine public service response, as time goes by it will be a good reference. Thank you!

 

[gerryvz]

I did it on a certain white 1995 station wagon about 2010, but unfortunately didn't photographically document the process. It's not a horrible job.

Just be sure not to lose any of the small metal clips down I to the abyss when cracking apart the blower motor box. IIRC the new regulator came with a new heat sink. It was a bolt- and plug-in thing. I did the fan and the regulator at the same time -- that way avoiding having to re-open the box to replace the other component.

Also, use the opportunity on late cars to replace the cabin air filters.

 

[nocfn]

Got my filters and regulator on the way, just can't seem to free the hunk of aluminum out from under the support. Thought about a gentle vacuum of the innards of the evaporator area while I am there so that is a side goal too, access to evaporator.

 

[gerryvz]

Yep, no better time to get a shop vac down that side of the evaporator.

Actually, you should order a new evaporator and replace it as preventative maintenance.




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[nocfn]

No on evap prevent [emoji857]but tell me how that little heat sync comes out and the access to the evaporator, I can clean a bit out for sure.

 

[gsxr]

Louis, any update? Can you post some photos of the project on this thread for future reference?

 

[nocfn]

Louis, any update? Can you post some photos of the project on this thread for future reference?

Yes I finished the job with a lifetime replacement FCP Euro KAE, German made resistor. Identical to OEM with subtle differences: leads are shorter making needle nose pliers useful in attachment to blower motor. Also, the resistor is glued to heat sink, so less t20 heads. The top hole is a larger hole so I needed a Phillips head the only mod. No pics as it is identical to the other OE I replaced, other than the KAE is one piece not 2. More in my owner thread.


Getting this up was a no go. I had to press the plastic screen in covering the evaporator to slide old heat sink out and new unit in. Not easy at all, thankful I did not break the plastic
screen.

 

[Maui]

I did it on a certain white 1995 station wagon about 2010, but unfortunately didn't photographically document the process. It's not a horrible job.

Just be sure not to lose any of the small metal clips down I to the abyss when cracking apart the blower motor box. IIRC the new regulator came with a new heat sink. It was a bolt- and plug-in thing. I did the fan and the regulator at the same time -- that way avoiding having to re-open the box to replace the other component.

Also, use the opportunity on late cars to replace the cabin air filters.

Regulator on said wagon appears to need to be replaced again. Fan stopped working. I hot wired the fan and it works. Checked the 30 amp fuse and it is fine. I'm down to the regulator.

 

[Redhairing]

This is my 1st time on this web site. I have a 95 sl500. Where is the blower fan resistor? Icannot find it.

 

[nocfn]

On the E500, it is under the mono wiper assembly, beneath the ductwork. Not sure your model.