Heating problems

New to the group. Replaced my water pump and tstat on my 08 tundra 5.7 and now I have luke warm heat on the driver's and warmer on passengers side side while driving and when at idle it blows cool air. Any thoughts?

 

Probably air in the system still. Try parking the truck on an incline and burping the system again with the heater on.

 

Ok but what is the best way to burp the system?

 

Remove the radiator cap and massage the hoses. I personally have a funnel that fits perfectly snug into the radiator opening. That way I can squeeze the hose without losing coolant when it bubbles. Have the truck running and keep an eye on the temp. Massage the lower and upper radiator hoses.

 

Thanks, I will try that after work today

 

I'm, you might want to keep your hands to yourself... lol... I would suggest you fill up the system with coolant and semi open the radiator to pressure release and turn the truck on with heat at max. I'm not sure if theres any other pressure release valve. Fill coolant drain through expansion tank as required... observe the operating temperature, if it starts to overheat turn it off give it 20 minutes to cool down and start over.

I've done this procedure in my smaller toyota but has a butterfly release valve which helps burp the system...

 

The heater core fluid also goes to the transmission. I'm not sure if it would have a bubble of air in it for long once the water pump starts turning.

 

Ok so I drove it home from work 40 minutes let it set for 15 to 20 to cool enough to remove the cap I cut a funnel to fit snug in the radiator started the truck backup and massage both upper and lower hoses for at least a half hour while the truck was running with very few bubbles but my bottom radiator hose is still cold it's not even warm to the touch my upper hose is very hot and both my supply and return hoses out of the heater core are hot. The supply I believe very hot in the return a little cooler from the heater core. Blowing cool air on the driver side and lukewarm air on the passenger side. I am stumped and my mechanic is stumped.

 

One thing you could try is to drain the system and use a hose to push water in reverse through the system just to see if there's something obstructing the heater core. Otherwise I would say it's an electronic problem and the system isn't moving the doors in the heater correctly. Possibly a Toyota dealer could reset the system (I've seen the option in TechStream but never used it).

 

Thank you I have already did a reverse flush on the heater core a couple of times and has not changed but I will contact Toyota tomorrow and see about the reset that you are talkin about did not know that it was an option

 

Keep us updated. What brand water pump did you buy? Did you compare it to the old one coming out? I'm wondering if the flow isn't as strong as it should be. I can't see how the belt could be put on wrong or the hoses incorrectly installed causing the flow to be going the wrong direction.

 

Whatever Toyota provided me

 

Just got off the phone with Toyota and there is no reset for any of the heater box dampers he said it sounds like there's still air in the system. The tech at Toyota told me to bring it in and they could look at it for $135 an hour to try and figure out the problem