[Mferris]

Is there a procedure for replacing the HCV on at 1993 Cab?   Both in terms of what needs to be removed to gain access as well as procedure/need for bleeding/burping the coolant lines afterward.   I've worked mostly on '60's cars which were more forgiving and don't know about 90's Porsches. 

Could not find anything on Clark's. 

 

Pictures attached show a very tight area - it looks like I might have to remove the distributor (?)  in addition to the oil filter just to get enough maneuvering room?  My car had a pretty major service by a Porsche dealer before I purchased it - so I don't know how many of the parts are stock (note the distributor is brand new).    As an example - I read on this forum about an aftermarket heat shield (?) - and it certainly looks like mine has one on it but I don't know if it's OEM or not. 

 

I've purchased the metal Audi HCV for the install , but also purchased the OEM and short hose adapters/clamps for a backup. 

 

Thanks in advance. 

 

 

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[MCL968]

I didn't have to remove the distributor, just the airbox to get some additional room.

 

You are correct, it is a tight fit. I believe there is a thread on here about a replacement valve that is metal. I think mine is a Mopar (Dodge) product. The inlet is a bit smaller so I used a piece of hose as a filler to fit the inside diameter of the Porsche hose. Either way, it works and it is not plastic. That is about the hottest part of the engine bay, the logic of putting a plastic valve near the exhaust manifold eludes me, but I am not a German engineer so maybe there was a reason.

 

Look for the thread, there were a couple other valves listed that would also work as I recall.

 

M-

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[Mferris]

 

Look for the thread, there were a couple other valves listed that would also work as I recall.

 

M-

 

 

Thanks - I did end up getting the Audi (5000?) metal HCV - and in the process learned that Napa will deliver same day for free to my house - that's not a good thing....  I'll attempt to get the metal one to fit - but figured I did need the additional fittings and clamps so I purchased a kit (from an ebay seller) who had the Porsche HCV + clamps + short tubing  as well. 

 

Off to the next adventure. 

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[tejon007]

Coolant bleeding procedure and diagram:



https://www.porscherepair.us/porsche-968...ystem.html

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[Mferris]

Coolant bleeding procedure and diagram:



https://www.porscherepair.us/porsche-968...ystem.html

 

Thank you.  I managed to remove the HCV (by taking off the airfilter/mount and oil filter) and only a few drops of coolant came out - so I'm hopeful I don't have to bleed the system. 

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[MCL968]

Bleeding the system is a piece of cake as long as you have a mid 92 or later car. The first month or so of production had the bleeder nut under the injector cover. All of the later ones are exposed. I changed the gooseneck out on mine to the later model to make bleeding the air out of the system easier. Just get it hot, turn on the heater, and have the front up a little (I did it in my driveway so the front was higher than the rear. Loosen the nut a little and look for coolant, and DON"T overtighten the nut when you are done.

 

Not a big deal, and you will need to do it after replacing the valve. Since yours is a 93 you should be able to do it in a few minutes.

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[Mferris]

Bleeding the system is a piece of cake as long as you have a mid 92 or later car. The first month or so of production had the bleeder nut under the injector cover. All of the later ones are exposed. I changed the gooseneck out on mine to the later model to make bleeding the air out of the system easier. Just get it hot, turn on the heater, and have the front up a little (I did it in my driveway so the front was higher than the rear. Loosen the nut a little and look for coolant, and DON"T overtighten the nut when you are done.

 

Not a big deal, and you will need to do it after replacing the valve. Since yours is a 93 you should be able to do it in a few minutes.

Thanks for the pointers. I just need to get the HCV installed now!

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