My Race Shop

 

©Copyright 2010-2014 My Race Shop LLC, San Diego, CA - USA
All items sold for off road use only. No warranties or guarantees are either expressed or implied. Use at your own risk.
©Copyright 2010-2011 My Race Shop LLC, San Diego, CA - USA
All items sold for off road use only. No warranties or guarantees are either expressed or implied. Use at your own risk.

                                                        HEATER BYPASS VALVE  KIT INSTRUCTIONS

PURPOSE

The Heater Bypass Valve Kit is designed to be used on cooling systems where continuous flow at the inlet and outlet hoses to the heater core circuit is a requirement. Many OEM and aftermarket heater-A/C units use a valve that stops coolant flow entirely during certain modes of operation of the vehicles heating-ventilation-air conditioning system. this is sometimes not compatible with a particular engine cooling system, and in this instance, the Heater Bypass Valve is a requirement.

FUNDAMENTALS

The Heater Bypass Valve ensures continuous flow through the inlet and outlet sides of the heater circuit at the engine, while stopping flow to the heater core when requested to do so by the HVAC controls. This is important because, for instance on a GM LS series engine, constant coolant flow is a requirement through the heater circuit in order for the thermostat to function properly under all conditions.

INSTRUCTIONS

If the heater hose circuit currently includes any other valve, THAT VALVE SHOULD BE REMOVED FROM THE SYSTEM. If there is no valve in the system, then the only reason to use this Heater Bypass Valve would be for a custom install where valve control is user/installer defined. Otherwise the Heater Bypass Valve should be installed in place on the "standard" flow/no-flow heater control valve.

The bypass valve is controlled by a vacuum control valve that needs to be hooked to two location.

      The vacuum control valve needs to be hooked to a 12 volt electrical source that will control the opening and closing of the vacuum control valve, and thus control when vacuum is sent to the heater bypass valve so that coolant is either allowed to flow to the heater core, or bypassed back to the engine. If there was another heater control valve in the system previously, then the elecrical leads from this switch/valve should run to the vacuum control valve. This will allow whatever was controlling coolant flow previously to continue to do its job with the new heater bypass valve. Lengthening of the control wires may be required.

      The vacuum control valve needs to be hooked inline between the engine's intake manifold and the heater bypass valve with vacuum line. The bypass valve and the vacuum valve use different size vacuum line, so the included reducer ir required.

The 4 port coolant bypass valve itself is simply put inline on both the inlet and outlet hoses running to the heater core. Please see the enclosed picture for a hypothetical representation of an install on a GM LS series engine.

aaaaaaaaaaaaiii