914 subaru water pump over heating Options

[jeepguy06]

hey guys

so I have a ej205 in the 914 and when sitting at lights in traffic it starts to overheat. I watch the temps clime to 208.4 at times if not hotter. I find that revving the car to 3k and keep it for about 30 seconds to get the coolant moving the temps will then drop down to 203. once i start moving and driving the temps drop all the way down to 197.6 I just feel that the water pump is not able to move the water from engine to radiator all the way in the front. has anyone else had issues like this and how did you repair them? add another water pump that's electric?

[Bartlett 914]

I have a 91 VW Camper with a 2.5 Suby. My waterpump is able to pump coolant a longer distance than you would have in a 914. My coolant lines are of sufficient diameter without too many restrictions. My radiator is new. There are a couple of known issues to consider. It is important to use a Subaru thermostat. Aftermarket ones should be avoided. The other issue is with the heater circuit. In a Subaru, coolant flows thru the coil at all times. Heat is controlled with a flap and not by restricting coolant thru the coil. This coolant flow is important as it flows by the thermostat allowing proper thermostat operation. Overheating can occur when this flow is stopped. The thermostat is low on the motor. Without a coolant flow, temperature near the bottom of the engine is cooler than at the top of the engine. The thermostat thinks the motor is cool and closes so no flow to the radiator.