problem

[joen85]

i jus bought a 91 mr2 a couple of weeks ago and now the heater is not workin wel the heater is working but there is no heat coming from it. i changed the thermostat and made no difference has anyone ever had a problem like this one how did u fix it please help me thanks

[MR2Jedi]

Try bleeding the heater core. If there is air in there, it will not give you heat. There is a big white plastic screw to do this.

[joen85]

witch part is the heater core? i dont no that much about these things?

[TheEngineer]

the heater core is located behind the dash but the heater air drain plug is located in the frunk bay on the back wall. Here is a picture from the manual showing the location

[joen85]

cheers mate ill look into that straight away thanks for your help

[joen85]

well hello again folks. i tried bleeding the plastic screw on the heater core a bit of air did come out but i still have no heat. is there anyone with any othet ideas what could be wrong any help would be great thanks......

[joen85]

Originally Posted by joen85

well people i tried bleeding that plastic screw on the heater core air did come out of it . but i still have no heat. would anyone have any other idea wot the problen could be?

[MR2Jedi]

Are you saying that previously you weren't getting any moving air from the system?
Also, did you have the engine running when you bled the core?

[joen85]

yeah i blead it wit the car running. i am only getting cold air from it and sometimes i get hot air but only for about ten seconds every once in a while

[MR2Jedi]

When was the last time you flushed your coolant system?

[joen85]

i never had that done before could that cause this problem

[MR2Jedi]

Well,if your fan is working and if you can get some heat and then not, maybe the core is clogged and hot water is not flowing thru it like it should . Another possibilty is the control that opens the valve in the heater core may not be working right. Linkage could be apart or stuck. Try operating it by hand and see if it moves.

[joen85]

well, i just flushed the radiator today and am still haveing the same problem heat sometimes but most of the time its cold air. if the controls were stuck would i still get that we bit of hot air now and again, or would i not get any at all?

[MR2Jedi]

For some reason, hot water is not flowing thru your heater core. Whether it's because it's not properly bled, a blockage or somethings wrong the valve that manages either cold or hot air flow .

[joen85]

well floks got the problem sorted there was a blockage in the rad a big ball of rust stuck in it. it must of being caused from lying up for a while. thanks for your help.