Heating only working intermittently - Ford C-Max Forum
 
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post #1 of 5 Old 02-01-2012, 07:38 PM Thread Starter
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Hi all I have a C-Max 2.0 Diesel (04 plate).Just back from a 25 mile drive. Heating worked fine for the first 23 miles, then blew cold for the remainder of the journey. Just been back out in the car - the heating blew hot, then cold, then hot, then cold again, all within a 2 mile journey. Any ideas what the cause is? Is it the thermostat?Also, if you have any idea what the cause is, if you could let me know the potential cost of repair would be, that would be awesome.Thanks.
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post #2 of 5 Old 02-02-2012, 04:59 AM
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usual reason for heaters blowing cold is an air lock in the heater matrix but it then normally continues to blow cold not alternate






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post #3 of 5 Old 02-02-2012, 08:17 AM Thread Starter
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Thanks Richard. If this was the issue, would it be an easy (inexpensive) job to rectify?
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post #4 of 5 Old 02-02-2012, 08:24 AM
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It used to be the case to get the engine warm without the radiatore pressure cap (expansion tank now) and then start squeezing all the hoses to get significant water movement

When heater matrix were easy to get out you could also try getting them to the lowest point so that the air rose of it's own accord

As an also check item and based on the "obvious first principle"
I presume the expansion pressure cap is OK and that the coolant circuit is full of water




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post #5 of 5 Old 02-05-2012, 05:38 PM Thread Starter
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Hi Richard, well first thing's first, I've just been out to check the coolant levels. Two things - the &*(*&^ cap seems to have broke when removing it! The 'outer' cap turned nicely, but the inner part is still in the reservoir. Also, the inside of the reservoir looks rusty, and I can't see any water movement. Has it run dry? What is the rust? Bit worrying! [img]smileys/smiley5.gif[/img]
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