Cupe Heating/circulation Problem

[Kapteinmoby]

Hey, i have a toyota avensis 1,6 4a-fe. i have a problem with my hot air in the car. The line into the heatermatrix gets hot, but only after reving the car (over 3k rpm) for a while. the out line is quite cold. so i think there is a circulation problem, but the car does not overheat even when i drive like an idiot( revs betwen 4000 and 6000rpm).

i had an incident this winter, i didnt use enough coolant so the coolingsystem was slush, but i dont think this have killed the waterpump since the car dont overheat at pretty hard driving.

please help!!

[Exvec]

Sounds to me like an air lock in the heater matrix?did you drain and refill,make sure to set the heating control to full on heat if you refill.

[Kapteinmoby]

its the 1998 model, no valves at all to the heater matrix, so the setting the ting to full on heat wil not do any difference. i have forced water trough the matrix before i connected the hoses. how much resistance should it be in the matrix?

[Kapteinmoby]

i found out that it was the heater matrix, the resistans in the matrix wasen't that different in the new one, but after i changed it it just worked like a charm!