Hello everyone, can someone be kind enough to tell how to replace both heater hose in my 90 740 wagon. Do I need to remove the intake valve to get to the hose? Thanks for any suggestions/advice.

I second the motion that it is a good idea to replace the vacuum operated heater control valve. When they crack (due to heat over a period of years) you will lose large amounts of coolant in a short period of time.

The overheated engine can easily damage the head or result in a blown headgasket- either of which is both aggravating, time consuming and expense. A new heater valve is less than $20 and easy to install. Think of it as insurance.

Randy

No need to remove the manifold. No special instructions either, remove the old ones and install the new ones. It is all self explanantory, remove the 4 hose clamps and one vacuum line and pull the hoses out. Transfer the old heater valve or, better yet, replace it with a new one and then stuff your new hoses back in. Tighten up, fill with coolant, pressure test and check for leaks, if none are found then start it up and let it reach operating temp and recheck your work.
If the hoses do not want to come off of the nipples even with the clamps backed all the way off then slit them with a knife right where the go onto the fitting and they should peel off.

Mark