Question about 1991 Volvo 740

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No heat in my 740 volvo turbo 91 wagon

The blower works and the heater core is fine,just changed the thermostat and radiator hose

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  • kmber12 Dec 27, 2008

    we tried that- ever hear of a vacuum switch?

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Heater core pluged up

Posted on Dec 27, 2008

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Heater core was replaced on my 1991 740 volvo


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I think that one still uses cables to control the blend doors and vent doors. Are you sure those are working and/or connected.

Also when you replaced the thermostat and heater core did you bleed the cooling system? With the engine cold remove the radiator cap and let engine idle up to operating temp while keeping the radiator topped off with coolant.

Are the hoses going to the heater core hot?

I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

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