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Old 01-06-2011, 01:10 AM   #1
Workman1788
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Zetec-No Heat, losing coolant, temp gauge normal

I've been working on a '02 Focus ZTS with a coolant issue and thought maybe someone on here would know better than me. The main reason I started working on it was for a "no heat" problem. It has been losing coolant for a while but there are no visible leaks. It will go through about a half gallon of coolant in a 3-4 weeks. It does make a noise like running water from the passenger side when you begin to accelerate. It even does it when the coolant is full and allowed to bleed for a while. Passenger floor is never wet and there is no smell of antifreeze. It does sometimes start running hot while sitting for a while in hot weather but cools down to normal when you start driving. Fans are working properly. The thermostat was replaced two days ago and has made no difference. The heater does blow warm (not hot) after it has been driven or sits idleing for a while but will randomly start blowing cool again. The blend door seems to be working correctly as far as I can tell. The vanishing coolant makes me wonder about a possible head gasket issue though I haven't done a compression test yet and the is no oil in the coolant and no coolant in the oil.

I've tried to be as thorough as possible though I'm sure I've left out some details. If anyone has any suggestions or possible fixes, shoot them at me. This one has me stumped.


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Old 01-06-2011, 01:39 AM   #2
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Ok check a few things do the comp. Test check the oil level, check the weep hole on the water pump to
See if any dry coolant has run out.
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Old 01-06-2011, 07:36 AM   #3
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It sounds like the heater core is clogged. This is not as common as it is with heater systems that use a cut-off valve, but it still happens sometimes. It's a good habit to blow out the heater core any time you have the coolant drained- like when doing a thermostat.

Remove the heater hoses from the engine block, and stick a hose in one, then the other. Blast with water until water flows freely. Look under the dash to make sure there weren't any leaks.

Finally, replace that reservoir cap. You can double check my theory by squeezing the hoses. Squeezing the hose will tell you if the system is "tight" or not. It works better when the engine is warmed. Sometimes if the cap is old- like yours- it won't hold pressure. If the system doesn't hold pressure, it can dump coolant through the overflow like it would when pressure exceeds 16 psi. I've had this problem happen to me and friends several times- typically it's what you said without the lack of heat- just a mysterious coolant loss. Squeezing the upper hose should make the overflow wheeze if that's your problem.

Locate the coolant loss first, then if the temp gauge still seems funny, we can double check it against ambient temperature using the odometer trick.
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