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Sorry first time using this site but hoping you guys could help me out, recently just bought a 2011 corsa sri 1.4 model and heaters are only blowing luke warm air, heater switch is working from cold to hot as I can tell the difference when changing the temp, different fan switch has is springy and not staying in the correct position so have ordered a new heater controls unit, im also getting a damp passenger foot well which from what I have been reading is the heater matrix with a leak so I have ordered a new heater matrix for the car along with a new thermostat jus incase for good measures, the window screen is getting foggy which is another thing that is pointing me to the heater matrix leaking, just hope you guys could give me some help as to what the actual problem is, there is mayo substance on the oil filler cap but none on the dipstick, dipstick is clear oil with no mayo kind of residue, don't seem to be loosing any coolant and at the most not a lot as it's done 150+ miles and hasn't seemed to move, not sure what else there is as I've only had the car 2 weeks, any more info I could give please let me know
 

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New message on sorting out heater problems

Firstly make sure the water pump is turning and you have water in header tank, if possible top of radiator, dont take the top of the header tank /radiator when hot, if you have to, use a glove and do it in stages, there should be pressure there if the rad cap is working properly. Make sure the temperature gauge is in the normal place, you will prob get more heat out the heater with the engine revving a bit. If the gauge doesn't go up to normal you wont get much heat out of the heater, make sure the cabin filter /pollen filter isn't blocked, or air cant get into the air intake.

If the heater blows out cold air, usually the thermostats stuck open, or the matrix is blocked or an airlock in the heater hoses. feel the heater hoses when the engine is hot, they should both feel the same, if one is hot and one cold the matrix is either blocked or you have an airlock in the hoses. May have to carefully undo the outlet hose, ease it off and let the air out, do it with radiator /header tank cap off. If the Matrix is blocked take both the hoses off and try to flush it out with a garden hose, both ways, Also check under dash, see if there is a water valve and its working properly, also check operation of heater controls, look under dash and see there doing what they should, by turning and watching the controls.

If the heater blower doesn't work, check fuses and any relays that it might use, the circuit usually is, ignition feed to fuse, fuse to motor, motor to resistor pack and from resistor pack to switch and switch to earth, so with a circuit tester you can check for power at various points. if the motor only works on fast speed suspect the resistor pack. Test circuit before wasting money on new bits. You can unplug the motor and substitute it with a bulb, if the bulb comes on and varies in brightness with different switch positions suspect the motor is faulty. The two weakest links are the motor and resistor pack. If all else fails try disconnecing the battery for 1/2 hour, can work wonders.

If the heater motor sounds noisy it's usually a sign it wants a new motor, they can get clogged up with leaves etc..if you see and signs of anti freeze up under the dash or on the carpet etc, it's either the hoses leaking or more likely the matrix is leaking, which can be a big job. also its worth checking the heater vents, like pour water in the grill in front of the windscreen and it should run out usually behind the front wheels on both sides, if it doesn't the drains are blocked, and some water could find it's way inside the car
If the top of the radiator gets hot and the bottom doesnt, it could be the water isn't circulating, if the top of the radiator is hot the thermostat is probably working, but problem could be the inpella on the water pump come adrift and no water is getting pumped through the system, or the radiator is blocked or partially blocked, you could try taking the bottom hose off see if water gushes out, sometimes some of the tubes can get blocked and some clear, so its not easy to reterman if radiator is ok or not, also you could have an air lock in the radiator.....
Well i hope this helps someone out there from Fred in Essex. 2016.
 
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