|
|
|
Jul 15, 2011 19:07:05 GMT
|
|
So I was about to connect up the heater on the W115 to the newly installed engine but I'm unsure about something; when i have the heater valve closed do i need to bypass it so coolant flows from the heater feed in the intake manifold back to the return in the crankcase or will there be a bypass circuit in the engine? I'm not sure whether the heater feed and return on the engine form part of the coolant circuit or just 'tap' into it, if that makes any sense?
|
| |
1992 190E 2.0 - first car, currently being driven by the wife.
1989 500SEC
1968 W115 4.2 V8
2000 CL500
|
|
|
|
|
Jul 15, 2011 20:08:17 GMT
|
|
Depends on the design of the heater valve which regulates the flow of coolant into the heater matrix inside the cabin. If the valve is designed to allow the water to pass through when the valve is closed to the heater matrix then you can put it into any coolant pipe and it won't obstruct the flow. If the closed valve stops the water flow then you'll have to create a by-pass so that the line you tap into isn't blocked by the new heater valve you've installed.
|
| |
|
|
|
|
|
Jul 15, 2011 20:36:03 GMT
|
|
the valve only has an 'in' and 'out' (well 2 outs, one to each side of the matrix) so i guess i will ned a bypass or something
|
| |
1992 190E 2.0 - first car, currently being driven by the wife.
1989 500SEC
1968 W115 4.2 V8
2000 CL500
|
|
|
|
|
Jul 15, 2011 20:42:44 GMT
|
|
Simple to test though. See if you can still blow through the matrix if the valve is shut. Make sure you don't get any anti-freeze on your lips as it's a bit fruity tasting. There are other ways to test it. You may also be able to see from the outside if it could be possible for the water to bypass the closed valve. Really depends on how it operates.
|
| |
|
|
|
|
|
|
|
|
I thought the heater matrix circuit just shut off the coolant, if it's plumbed in parallel?
|
| |
|
|
|
|
|
Jul 16, 2011 12:37:16 GMT
|
Heres the cooling circuit from the W126 engine manual  It doesnt give an details of the valve or any bypass This is the parts catalogue for the W126 heating system, I cant see anything showing a bypass circuit  This is the parts catalogue for the W115 heatign system, again I cant see anything showing a bypass circuit.  |
| |
1992 190E 2.0 - first car, currently being driven by the wife.
1989 500SEC
1968 W115 4.2 V8
2000 CL500
|
|
|
|
|
Jul 16, 2011 19:17:14 GMT
|
|
i think i just answered my own question, looking at that circuit diagram a little closer it does look like the heater is plumbed in parallel.
|
| |
1992 190E 2.0 - first car, currently being driven by the wife.
1989 500SEC
1968 W115 4.2 V8
2000 CL500
|
|
