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Old 04-14-2019, 05:47 PM   #1
soclosenotnear
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Default Quick radiator question

In a pinch, I've thrown a n/a 940 radiator into my '95 944 turbo. I'll find out if it cools well enough if I can get the car driving. It doesn't do any traffic or anything.

My question is besides the transmission cooler lines, there is another plug on the passenger side. It literally pulls out with no effort and I can't imagine it seals, especially with pressure. My car has an m47 and if it's trans cooler related, then it's irrelevant. What does this plug seal/go to?
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Old 04-14-2019, 06:01 PM   #2
iHateVolvoPeople
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Quote:
Originally Posted by soclosenotnear View Post
In a pinch, I've thrown a n/a 940 radiator into my '95 944 turbo. I'll find out if it cools well enough if I can get the car driving. It doesn't do any traffic or anything.

My question is besides the transmission cooler lines, there is another plug on the passenger side. It literally pulls out with no effort and I can't imagine it seals, especially with pressure. My car has an m47 and if it's trans cooler related, then it's irrelevant. What does this plug seal/go to?
Its an overheat switch on some 7/9, and it is the main cooling fan switch on Regina cars. Don’t use it to trigger your fan, LH will do that for you in a 95.

The radiator is plenty big enough to cool your car unless it’s making a lot of power.

As for keeping that little switch pushed in, Ive seen people use some thin bailing wire and attach it somewhere so it’s impossible for it to pop out. I think I JB welded mine, don’t recommend it though.

But if you switched to a snmakler rad, does the shroud still fit? Or did you go mechanical fan? The shroud fitting well is important.
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Old 04-14-2019, 07:21 PM   #3
soclosenotnear
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So, that plug sees radiator coolant and not trans cooler fluid? I don't need it to do anything but stay in it's place. The "plug" is literally a plastic plug. I didn't notice the hole being threaded. The plug would almost fall off if flipped over. There's nothing holding it on more than a small amount of friction, so if it sees coolant pressure, it won't stay plugged. My old radiator had no such provision.
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Old 04-14-2019, 07:53 PM   #4
hiperfauto
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If it's the same as a 240/740 radiator it uses a rubber seal that expands when the sensor or plug is inserted. Coolant will swell the seal so that it won't pop out under pressure but it's still a good idea to use a zip tie just in case.

https://www.tascaparts.com/oem-parts...ushing-1378869

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Old 04-14-2019, 08:17 PM   #5
iHateVolvoPeople
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Quote:
Originally Posted by soclosenotnear View Post
So, that plug sees radiator coolant and not trans cooler fluid? I don't need it to do anything but stay in it's place. The "plug" is literally a plastic plug. I didn't notice the hole being threaded. The plug would almost fall off if flipped over. There's nothing holding it on more than a small amount of friction, so if it sees coolant pressure, it won't stay plugged. My old radiator had no such provision.
Yes it sees coolant only and full cooling system pressure. Do what you want to hold it in place, because even when working how it’s supposed to, Ive seen them pop out. Especially in traffic when coolant temps and pressures rise.

Btw, a 75kpa cap is a good upgrade on any 7/9 IMO.
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Old 04-14-2019, 08:29 PM   #6
soclosenotnear
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Thank you both
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