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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1 Answer

1994 Volvo 940 floors wet


check your heater coil

Jan 22, 2013 | 1994 Volvo 940

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Heater is very poor


Has the vehicle been run with anti-freeze its whole life? If not, then flush heater matrix.

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.

Once all is clean and free flowing, reconnect and fill entire system with a 50-50 anti freeze-water solution.

If blockage cannot be resolved, then replace heater matrix.

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

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1 Answer

Coolant is leaking on the passenger side floor inside my car. Light sweet smoke is coming out of the heater and leaves a residue on my windows. I think it is the heater core but I am just not sure.


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1 Answer

Driver side floor wet. It has not been raining and nothing has spilled. Would this be a mechanical problem


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Your heater matrix has fractured.Suolution fit new matrix.Or you can have it bypassed.But you want get any warm air from the heater if its bypassed.But it will stop the water entering inside your car.

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1 Answer

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Sounds like a leaking heater core or faulty hose connections.
Sniff a tissue after blotting some of the wetness or; it may not sound appetizing, but to check if it is coolant + water, take a clean cloth, blot the wet spot and touch the other side of the cloth to your tongue.
Coolant doesn't have a strong odor unless it is hot but it lends a sweetness to the coolant that is easy to detect. That is why one shouldn't dump coolant on the ground since domestic animals will lap it up. 

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