Ford Focus heater problem? - 1

MY Ford Focus ( TDDI 1.8l 2003) has some issues with heater - it does not work at all. It spins the fan and only cold air comes out. Everything else regarding fans and AC works fine just no warm air. After examining relay box under the hood I think that heater relay is missing. Can missing relay cause heater to not work? Is there even relay that is responsible for that?

MY Ford Focus ( TDDI 1.8l 2003) has some issues with heater - it does not work at all. It spins the fan and only cold air comes out. Everything else regarding fans and AC works fine just no warm air. After examining relay box under the hood I think that heater relay is missing. Can missing relay cause heater to not work? Is there even relay that is responsible for that? You live in an age in which cameras do focus themselves - generally successfully. First, the relay box has a position for every possible option that was available in that car, so it is normal for there to be unused slots. Now, when you say the fan is working, the interior heater blower fan or the radiator cooling fan? The usual cause of no heat is low coolant, so make sure it's topped-off. Also, there's a design flaw in one of the parts in the cooling system that could also be leaking coolant. The thermostat housing in on the end of the head and is a 'plastic' block, where the upper radiator hose attaches to the engine. The sealing surface of the housing to the engine head uses one O-ring that sits in a groove cut into the 'plastic' housing. On some of the housings, the groove for the O-ring is cut too close to the back edge of the block. The groove lip cracks because it's too thin and allows the O-ring to be pushed out a bit and leak coolant. So, if it is losing coolant and that's why the heater isn't hot, see if it's leaking behind that housing.

First, the relay box has a position for every possible option that was available in that car, so it is normal for there to be unused slots. Now, when you say the fan is working, the interior heater blower fan or the radiator cooling fan? The usual cause of no heat is low coolant, so make sure it's topped-off. Also, there's a design flaw in one of the parts in the cooling system that could also be leaking coolant. The thermostat housing in on the end of the head and is a 'plastic' block, where the upper radiator hose attaches to the engine. The sealing surface of the housing to the engine head uses one O-ring that sits in a groove cut into the 'plastic' housing. On some of the housings, the groove for the O-ring is cut too close to the back edge of the block. The groove lip cracks because it's too thin and allows the O-ring to be pushed out a bit and leak coolant. So, if it is losing coolant and that's why the heater isn't hot, see if it's leaking behind that housing.