Aften run pump keeps running with new 324

[johne]

180,000 miles in my S2 and I've never got the after-run relay to kick in. Yes, I've tested it and the module works but never got things hot enough to trigger it at the moment of switch off.

Given the above I've long given up worrying about whether it works or not.

[hashluck]

180,000 miles in my S2 and I've never got the after-run relay to kick in. Yes, I've tested it and the module works but never got things hot enough to trigger it at the moment of switch off.

Given the above I've long given up worrying about whether it works or not.

This is reassuring thank you

[Tractor Dave]

There is a way to test it from memory. Urs4boy did a good thread on cooling system here if you hunt for it. Mine only comes on after a really fast run on a warm day.

[simons2]

If you turn on your ignition then you should hear the pump run for about 10 to 15 seconds if I remember correctly , it’s also very quiet and hard to hear

[johne]

IIRC the best way to test it is to connect the two wires at the temperature switch in the cylinder head water manifold together and then see that the pump and fan start when you stop the engine.

If you want to make the system more effective replace the manifold temperature switch with part #LWS294. It has a slightly lower trigger temperature than the factory fitted one so the after-run system is triggered more usefully.

[Henkjan]

Braeckie
I gathered this info a while ago, I’ll repost it here.

thanks!

it's tru hole, so doable for most of us as long as you can tell the hot part of the soldering iron

now just need to find whare I left the module, I removed it long time ago because the fan kept running, draining the battery

[hashluck]

There is a way to test it from memory. Urs4boy did a good thread on cooling system here if you hunt for it. Mine only comes on after a really fast run on a warm day.

Pleased to report that in all this hot weather in the UK I have heard my after run pump working on one of my S2s. Will test the other soon,

[predding]

Looking for turbo after run pump issues and found this thread which is great. Just to say I had my original ARP fail totally, removed and hooked it up direct to a battery. It buzzed like the rotor was trying to turn so took it apart. Years of silt had seized the rotor so that explained that. Now I have fitted a new one but not running (I tested it before fitting on a battery and all good).

The main reason I am writing this is because of the ongoing overheating issues - I have just thoroughly purged the cooling system and run the engine up to temp, the new thermostat has opened (I also tested that before fitting) but the engine is running as lumpy as hell and the digital gauge is up and down like a rat up a drainpipe.

So I am wondering if the seized old pump has caused the relay 214 to fail and the 324 which I will check but does this after run pump affect to engine running / turbo getting hot on idle or does the main water pump take care of it and the ARP is just that ie its only for the after run