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 Rapier Fastback heater hose water connections
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12 Posts

Posted - 04 Jul 2018 :  05:58:43  Show Profile  Reply with Quote
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?


United Kingdom
155 Posts

Posted - 05 Jul 2018 :  16:12:43  Show Profile  Reply with Quote
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!

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United Kingdom
968 Posts

Posted - 06 Jul 2018 :  11:23:31  Show Profile  Reply with Quote
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
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