Heater control valve repair / replace ?

[Stilllearning6]

E38 1998 :

Experiencing no cabin heat.
Suspect failure in heater control valve.

Is there an alternative to a new $500 heater control valve , such as a repair kit for the internal gasket / seals?

I tried tapping the HCV to attempt to un-seize possible stuck piston solenoids. FAILED, still no heat.
I did not check yet if applied vacuum will move the control valve mechanism open/ closed.
Will do that soon.

Youtube showed a BMW owner ( different model) replace several HCV internal seals that were deteriorated.
Perhaps, I have same issue .

Is there an E38 HCV repair gasket / seal kit?

[purplecty]

Check eBay for rebuild kits

[Stilllearning6]

Thank you .
Approximately $25 - $40 kit : More parts/kit with more $$$.

[goinstrong]

Every now and then a rebuilt one will show up on eBay. I paid $199 for mine after trying to repair it with the kit...


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[waballoo]

I've tried the repair and it worked for me. While at it do replace the hoses with aftermarket Gates (or OEM if so inclined they're not that expensive), they're probably toast.

But "no cabin heat" is not IMO a symptom of a broken auxiliary pump. When it fails it's always open, so there's heat to the feet even when requesting cold.

That being said there's a high probability that yours failed just as anyone's, fix it and see what's what.

Do note that it's usually the solenoids failing (which the repair kit addresses), but maybe the pump itself failed. In which case you should replace with a used one. There should be a buzz coming from it when ignition is on 2.

[waldo9190]

Replacing the heater control valve (HCV) can indeed be costly, but it's essential for restoring cabin heat. While repair kits for vehicle for specific models like the BMW E38 may exist, they can be challenging to find. It's worth checking with specialized auto parts suppliers.

[RDE38]

Hopefully the OP has fixed the issue by now

[Mayorchuck]

Hopefully the OP has fixed the issue by now

I think waldo is AI. Been seeing a number of Captain Obvious posts like this.