porsche965

Hi,

Just as you think you have sorted one problem another problem rises its head. The Oil Thermostat in my 964 is giving trouble, its not allowing the oil to pass out to the oil cooler (metal pipes are not getting hot along drivers sill, front fender is not getting warm either), can the thermostat itself contained within the oil thermostat assembly be replaced, i read somewhere that oil thermostats on '89 - 92 964 require that you change the whole thermostat assembly, but that from '92 onwards you can buy a replacement thermostat, i am just wondering is this correct and will i have to replace the entire oil thermostat assembly?

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Nelius
Ireland

dfinnegan

I have a 91 and was able to replace just the t'stat. It's a cylindrical unit. About like a stack of quarters. See this thread

porsche965

Hi

i just removed the thermostat from the housing assembly yesterday, i then decided that i would try and run the car for a couple of minutes without the thermostat in the housing (should allow oil to flow freely) to see if the pipes heading out to the oil cooler would get hot and allow the oil cooler fan to cut in, to my surprise these pipes remained cool even though the housing assembly itself was very hot to touch. after this i removed the oil plug (sump nut, at rear of oil thermostat assembly) and a couple of litres of oil came out here so i can only assume oil is getting to the oil thermostat assembly, it just does not seem to be passing through. im just wondering are there anymore parts to the assembly housing that could be preventing oil from passing out to the oil cooler unit? Has anyone had a similar problem and found a solution?

i would be greatful for any help on this matter as i would like to get the car on the road again before its parked up for its winter hibernation period!

Regards,

Nelius

Ireland

3blackbirds

My t'stat went out in mine a few months ago. I have a '90 C2 60k miles. I did the same by taking the insides out to test the fan and that the lines were ok. Well, the insides act as a pressure valve as well. You wont get oil up front by taking it out. I've seen replacement insides, but not sure for our block of years. A new one cost me 800 bucks!! Porsche redesigned our t'stats. I have seen used t'stats on ebay for $30 right after I got home from the shop... (figures) If you boil the inside spring assembly in water, and it doesn't move, t'stat is bad.

porsche965

hi 3blackbirds,

Thanks for your response,

Just to confirm what your saying is that oil will not flow from the thermostat assembly out through the oil lines ( metal pipes at sill) to the oil cooler without having the thermostat insert inside the assembly?

were you also unable so to test your fan and oil lines when you removed the inside thermostat from the housing assembly?

Regards,

Nelius

Ireland

Hacan

Hi
oil termostad is a mechanic part,it has relief valve in it and at a specific temp. it opens mechanicaly.i think your termostad need to be repaired.if you look pelicanparts you can find oil termostad repair parts.
There is nothing between oil termostad and oil cooler.There is only straigth tube to oil cooler and return is same only tube.

3blackbirds

Yes, that is correct. When you take out the actual spring assembly, oil will not flow through the lines, to the cooler and return back. Not allowing to test the fan and lines. You won't feel the warmth on the fender and hear the "gurgle" from the cooler.

When I was researching how to troubleshoot and repair this on my own, this piece of info was not to be found. I had my internals out and boiled it to see if it would move, it didn't. I left it out and started the car, no oil ran up front. I was at a loss as to why it wasn't flowing. I called my local Porsche parts department to get a price on a new one, approx. $800 bucks. They said Porsche redesigned the housing, that's why the price is high. I took it to a shop that is reputable with older Porsches because the car stumped me and thinking "I don't need a new housing." The guy who worked on it didn't call me to tell me to tell me what it was, just replaced it. It needed a new housing. He explained that that the internals acts as a pressure valve and that's why I wasn't getting oil up front. He couldn't get new internals, just a new housing. A nice bill later and piece of mind that it was right, almost worth the bill. I get home and searched ebay, there were three internal assemblies that were used for $30 each....

Jamie

wellcraft290

Also was it running hot? How do you know it was not working? Just by feel? The oil will not run unless it gets hot enough to open.

964russ

My stat is leaking but works perfectly.
I just got a stat of flea-bay for £40, the flash goes in on tuesday to sort leak.
If it dont need the stat then ill sell it on.

porsche965

hi wellcraft290,

i left the temperature run up to well over have way, close to the 2nd top indicator on the temp guage (stat should be opening by then), and the pipes were still cold so i can only assume that the stat is not working as oil is not passing out to the oil cooler.

Regards,

Nelius

Ireland

porsche965

Hi 3blackbirds,

thanks very much for your helpful reply, hopefully a new replacement stat should sort out my problems.

Regards,

Nelius

Ireland

porsche965

hi

i just rang my local Porsche dealer here in ireland enquiring about the thermostat insert replacement, Part No:964 207 047 03. They off course confirmed that these parts have been discontinued and that the replacement part is now a fully enclosed unit at a cost of €352 + VAT, i am just wondering does anyone out there know of anywhere else i could get one of the replacement insert part (i have already tried pelican and they do not have them).

i have looked up e-bay and there is one or two Thermostat assemblies for sale, but they state on the disclaimer that they have not tested the thermostat inside. it would be a gamble i guess in buying one.

i would be greatful for any help on this matter

Regards,

Nelius

Ireland

scott 964

Nelius

Mine was seized when i bought my car i took it to a local porsche specialist. He advised there were different types of stats on different yeqar cars, so no rule to follow. He fitted me a replacement part for £300 parts and labour. Try Porschapart bury uk they are bound to have a used part for you.

ps if your car has been running hot i would change the oil, i know its £60 or there abouts but its still worth doing.

scott

porsche965

Scott,

Thanks very much for your reply, do you have a contact number for them?. Its very difficult to source parts for Porsches here in Ireland. i only changed the oil about 400 miles ago, but knowing my luck it might be safer to replace it once i have the new stat fitted.

Regards,

Nelius

Ireland

scott 964

01706824053 there may be others i can find if you are still having trouble