Hose identification on 1992 740T - photo included. Topic is solved

jmscdgn · Post by **jmscdgn** » 02 Sep 2020, 18:51

Hello,

Could somebody please shed some light on what hose the arrow is pointing to in the attached image?

I'm in process replacing the oil separator and doing an EGR clean, but this hose won't budge and is prohibiting lifting the separator.

Any words of wisdom would be much appreciated.

Thank you.

James

Post by **RickHaleParker** » 02 Sep 2020, 23:43

Heater hose. The vacuum controlled heater valve in the hose is a dead give away. Lots of companies used that valve. The hose leads to the heater core at the firewall. Does it not?

The Nipple is probably corroded under the rubber. Drain the coolant first. Take a pair of pliers twist the hose around the nipple back an forth unit it the rubber breaks free of the nipple. Then wiggle the hose off. If you cannot get it to break free. Slit the hose at the nipple and pull it off. Then get a new hose.

jmscdgn · Post by **jmscdgn** » 03 Sep 2020, 09:52

Dear Rick,

Thank you for hitting the nail squarely on the head. Indeed, the hose leads into the firewall.

Thank you also for your advice on draining and removing the hose. May i ask, would draining the coolant solely from the engine block drain cock be sufficient for this hose's removal?

Many thanks again.

James

Post by **RickHaleParker** » 03 Sep 2020, 11:22

jmscdgn wrote: ↑03 Sep 2020, 09:52 May i ask, would draining the coolant solely from the engine block drain cock be sufficient for this hose's removal?

You just need to get the Coolant level down and below the nipple. Draining from any point below the nipple will do.

jmscdgn · Post by **jmscdgn** » 08 Sep 2020, 16:38

Thanks Rick.

All went smoothly, and also took the opportunity with the coolant drained to swap out the original coolant temp sensor. Happy days. thanks again for your help.

J