Question about 1994 Volvo 940

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1994 volvo estate 940SE is haemorrhaging coolant to internal floor areas. new heater matrix has been fitted but it's still happening. no water in the oil and no white exhaust but garage mechanic insists it must be head gasket though there is no evidence of this and engine running smoothly as always. also have tried radweld with no effect except smell of radweld in car when running. please advise. Terry

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You need a new heater core.

Posted on Feb 03, 2010


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With vehicle in cold state, disconnect heater matrix feed and return pipes from within engin bay. Turn the vehicle's internal temperature setting to hot. If the vehicle is fitted with climate control, then do this with the ignition in the 'on' position.

Take a garden hose and with low pressure first, try flushing the matrix. If the water pressure is not enough to flow through matrix at low to medium pressure, then a blockage is almost a certainty. If water does not flow at first, then try using a high pressure air-line to force air and any blockage material through the matrix and out of the exit pipe. You can also reverse the flow to blow or flush any dirt out of the other end.

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If no blockage is present then continue to check heater control switches and wires.

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