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Mondeo 2.0 TDCI 130 2003. The cooling fan starts

Mondeo 2.0 TDCI 130 2003. The cooling fan starts running long before the engine has reached it operating temperature. I suspected the thermostat and changed it for a new one but the problem remains. What other causes might there be? Is there an alternative route for coolant to reach the radiator, effectively bypassing the Thermostat. The cooling fan relay and fan can be heard going on and off intermittently soon after starting the engine. The engine temperature gauge rises above 60 degree mark after about 5 miles and eventually reaches the half way mark. Needless to say the passenger compartment heater is very ineffective producing only a little heat after a long delay. David-W

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Posted on Jan 02, 2017

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SOURCE: engine reaches running temp but no heat in van .

You should have 2 water lines coming out of the heater. Without burning yourself, check the 2 lines with your hand while the engine is running. If both lines are hot you have flow through the heater core. This would be good. The lack of heat would be a vent door in the ductwork is not opening.

If only 1 line is hot you either have a control valve that is not opening because of a bad control cable or bad vacuum switch. If the control cables and vacuum switch work, the last bad thing would be that the heater core is plugged.

Posted on Jan 26, 2010

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SOURCE: My 1997 Ford Thunderbird is

One thing to check is the radiator fan. Does it come on as soon as you start the engine? The fan should not come on until the engine reaches temp. and then when using the A/C. The fan should be off during warm up. Now,,, when using defrost, most cars now use the A/C to mix in cool air with warm to defog and deice at the same time. Which means the A/C compressor is on and the red. fan will be on also. One reason to run a bit of cool air in the deice is so you are not blasting hot air at a frozen windshield which could cause a crack. So if you are starting your car and letting it warm up to deice the windshield, run just the heater first for a while, before you change the setting to deice/defog. Check the rad. fan with the heater off, start the engine, then change the settings on your heater to see when the fan comes on. If your fan comes on with no heat settings then you have a problem with the fan/relay circuit.

Posted on Feb 07, 2011

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