a final rubber washer. Cut the head from a second tie- rap, slide it over the protruding end of the first and pull the whole sandwich tight. Repeat in each corner of the condensing radiator for a simple and secure fixing. It is important that the Tie-raps are tight enough to prevent movement that may damage the matrixes. IMPORTANT NOTE: When tightening the unions on the condenser and evaporator use two spanners so that the welded connections to the units are not stressed and damaged.
COMPRESSOR
It is possible that the engine you choose for your car will have been used in a vehicle fitted with air conditioning. This means that, even if your own donor had no A/C, the block is probably drilled to accept standard compressor mounting brackets and that standard pulleys and fan belts are available from the vehicle manufacturer. However, if you choose to install our compressor you’ll need to fabricate brackets for mounting and belt adjustment. You could also require an additional crankshaft drive pulley groove. Our 'A' groove compressor has a twin groove pulley so you can juggle the alternator or power steering pump drives and keep just a single groove crank pulley. A 'POLY V' pulley compressor is also available.
Fan belts are measured around the outside circumference so, if you measure around the pulleys with a wide tape measure you should get an idea of the size you need. When the clutch of an A/C compressor switches in there is an immediate load on the engine. On smaller engines this extra load may cause the engine revs to drop- possibly stalling at tickover. To overcome this problem some engine management systems automatically increase the tickover speed by a couple of hundred revs whenever the compressor cuts in. Your engine circuit diagram (see the relevant ‘Haynes’ manual) will point you in the right direction.
CONNECTING THE HEATER The heater control valve can be mounted anywhere provided the operating cable and control knob reaches a suitable mounting position. It makes sense, for safety reasons, to fit the valve outside
hose).The fewer hot water connections in the cockpit the better. Use good quality 5/8in (15mm) heater hose and fit two good quality Jubilee clips on each connection. Re- tighten the hose clips after a few miles.
MOUNTING THE DASH VENTS AND ROUTING THE DUCT HOSE We can supply a range of face and demist vents to suit your installation. You can install, for example, two eyeball vents positioned one on each side of the dash and one rectangular vent at the base of the windscreen for de-mist. Or two or three small demist vents fed from a plenum bonded to the underside of the dash. Cut and fit the large bore duct hose bearing in mind that flow will be enhanced through a hose that is slightly stretched. Route the duct hose ensuring that there are no kinks and a minimum of sharp bends.
Your local Yellow Pages will list vehicle A/C specialists who will evacuate and charge your system. Many offer a mobile service and will charge your system at home.
NOTES
Heater hose routing in a Foreman Mk4
of the cockpit area. Most engines will have a heater outlet union somewhere on the pressurised (top hose) side of the engine. Connect this to the inlet side of the heater control valve. Check the valve for correct flow direction. Connect from the flow valve to the uppermost connection on the heater matrix on the under dash unit. Run the return line from the lower matrix connection to a union situated just before the water pump (usually in the bottom
Page 266 To order Tel: 01580 891309 or 07964 336183 or Fax: 01580 893733 ISSUE 26
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