940 1993 heater hose.

btdavis43 · Post by **btdavis43** » 12 Nov 2009, 12:35

I have an 8 valve engine. I need to replace the heater hoses. What is the best way to get to the area where the hoses attach to the block? There is so much in the way, I can't see where it connects. Any advice is appreciated.

Post by **billofdurham** » 13 Nov 2009, 07:35

Unfortunately the heater hoses are very difficult to reach and, unless uou take off anything in the way, you will have to work through the clutter.

Both heater hoses are attached to pipes on the bulkhead (firewall). The inlet hose comes from a nipple towards the rear of the cylinder head, driver's side in the US. The outlet hose goes to a metal pipe which runs alongside the engine on the passenger side.

When draining the system set the heater control to maximum heat to allow the heater to drain and leave it at that setting when refilling the system.

To avoid confusion with the hoses remove and replace them one at a time from the pipes on the bulkhead.

Bill.

Post by **writer100** » 16 Nov 2009, 12:05

I recently did the hoses in my car, and -- for me anyway -- it was no picnic. I used a padded board across the engine bay to gain access. (Use rubber foam as it is less likely to slip down the slope of the fenders. Also, parking your car on a slight uphill helps to negate the fender slope.)

Then you need good lighting. The hose connection under the intake manifold in particular needs to be illuminated. A quarter inch drive metric socket set with an extension bar will also be useful. Be sure you don't scratch the hose ports, as this can cause leaks. Clean them before installation with a solvent.

One of the hoses has the heater control valve. When you get one end of this hose free, you can lift it high enough so that you can remove the vacuum line.

As Bill says, do one hose at a time. I used Volvo hoses, as I'm told they are the best, and I didn't feel like doing this again any time soon.

When you get everything back together again, place the heater setting on full heat. If the air that blows out is only tepid, don't worry, you have an air bubble. Just keep the heater on. For me, I just got down the street and the bubble passed out of the core on its own. Then it blew hot air as per design.

Good luck.

Alex