Heater works when outside temp is 20 and up but is poor when it is colder. Replaced thermostat, flushed everything. Checked all the controls and such, looks good. after 30 min of driving this am still just warm heat, got out and felt upper and lower rad hoses, bottom was cold, top was warm but not h…

Thats a can do, a little more info for your pleasure. If i run the car, no rad cap, i can pull the heater core lines off and there is a trickle flow in or out. I flushed core several times on several occasions because everbody says core is the problem. flow through the core is not the issue but air …

Oh, thanks for your help, i feel i am a pretty decent mechanic but this ones is killing me.

Have you considered blocking part of the radiator with cardboard to see if that helps with the heat? BC.

I did that this morning, the cardboard was about 8x18, i put it in from of the top hose.

Did not seem to make any difference.

I am with you on this one, if the pump was weak, you would think i would have the opposite issue. That and pump with steel fins dont usually go bad, they start leaking. I think maybe i may have air in the core that will not come out, therefore little flow. but i dont know, i am at a loss. I just par…

If you get the radiator neck to be the highest point (hill, ramps, jacks) you should just be able to run it with the cap off to purge the air. The thing is though, that you still shouldn’t have a cold lower radiator hose - unless when you said you got out and checked the radiator hoses you meant th…

That is what i am trying to do with the hill, so we will see. On the lower hose, i do mean rad hose to the thermostat and engine. It seems like it does not want to come up to temp and open the ther but i have seen it come to temp and open the therm on other occasions. I used one of the laser temp …

Occasionally a radiator hose can have an internal problem. It may look OK on the outside buy not the inside. The only way I know to check it is start taking things apart.

Heater problems Toyota Rav4

Maintenance/Repairs

cigroller January 26, 2011, 8:52pm 10

Perhaps you need a new water pump? This doesn’t make any sense b/c you should overheat eventually if the pump isn’t working. But if you have the car running and pull the inlet hose to the heater core you should get more than a trickle - unless I read that wrong. You’re lower radiator hose should not stay cold either.

Topic		Replies	Views
NO heat and 600 miles short of 300000miles Maintenance/Repairs toyota , heating , previa	6	954	May 29, 2010
Thermostat closing when starting to drive, please help Maintenance/Repairs	63	2584	April 20, 2024
2008 Toyota RAV4 Heating Problem Maintenance/Repairs	7	7115	October 18, 2015
07 Toyota Sienna takes 20 mins for interior blower to blow hot Maintenance/Repairs	36	7369	August 27, 2015
Engine Runs Cold No Cabin Heat Maintenance/Repairs ford , e150	85	11581	April 14, 2017

Heater problems Toyota Rav4

Related topics