I am about to replace the heater water hoses on my Rapier which has a heated manifold. All the illustrations I have seen show the thermostat to heater hose going to the bottom tap pipe fitting and the other shows upper tap fitting going to the rear of the manifold. When I look at the car itself, these hoses are presently connected the other way round? At present the heater does not have a hot function. Wonder if this reversal of hoses has anything to do with the non-functioning of the heater?
Hiya Australia. My Series 5 Rapier has the hose from the top of the water pump going straight to the heater unit. The other side of the heater returns through a pipe going to the tapping at the rear of the cylinder head. This leaves the inlet manifold un-heated. Heating of the manifold is only any help in Arctic cold conditions. I imagine that won't affect you too often!
Yes, I always forget which way around they are supposed to go, but I didn't find it caused issues with the heater, which ever way round I put them. I think correct is the bottom one from the heater outlet goes to the bottom of the thermostat housing & the top one to the top of water pump (via the manifold on std. cars). I agree with jimlagos; don't bother with the water heated inlet manifold - just use an Alpine or H120 heather hose direct to the water pump. 1st thing I did was cut the connections off the manifold - looks neater and I found car ran better without that set up :-). G