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Heater box removal - will this work?


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I need to pull my heater box and re-furbish/repair, but my '02 projects take me awhile (too much job and 4 year old sometimes, not enough money ever).

So... can I "short circuit", as in connect together, the input hose from the

manifold to the output hose. In essence I just want to remove the heater box and valve from this path temporarily.......

To me, from the engine's point of view, it seems this would be equivalent to having the heater wide open all the time..... or would I be causing some thermal problem without the heater core sucking off heat.

1975 - 2366762 Born 7/75

See the whole restoration at:


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do it. Actually, the engine will "think" you have the heater completely off, because you won't be bleeding off any of the heat from the system - so it will run just like when the heater is off. You can connect the 2 hoses or just plug them both.

Bill in MT

1969 and 1970 2002s

1988 735i

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drive it in the rain--you're gonna have a big hole in the firewall where the box went.


'69 Nevada sunroof-Wolfgang-bought new
'73 Sahara sunroof-Ludwig-since '78
'91 Brillantrot 318is sunroof-Georg Friederich 
Fiat Topolini (Benito & Luigi), Renault 4CVs (Anatole, Lucky Pierre, Brigette) & Kermit, the Bugeye Sprite

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If you need to drive it in the rain or for any extended period of time:after doing the hose bypass, cut a rectangle of masonite to fil over the hole in the firewall, put closed cell sticky tape on the outer edges of one side and bolt it in to cover the hole.. You will be watertight for as long as you want. I ran for 6 months while rebuilding my heater box.


'74 ex-malaga 8 yr. driving restoration

4-spd, recaros, front bbk, I.E. bars+.s.exhaust. heater refurb(thanks Kieth), total motor rebuild 175 mi ago

(thanks Steve P., Jeff I.)

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Actually, you can plug the ends, too, and that's the

equivalent of 'off.'

What I've done is connect the 2 with a restrictor with a 1/8" hole.

That way the head bleeds a lot easier, but there isn't a hot water

bypass around the radiator.

Which never caused problems when it was wide open...


"I learn best through painful, expensive experience, so I feel like I've gotten my money's worth." MattL

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