2001 Mazda Tribute heater is lukewarm after replacing radiator, water pump / belt and thermostat. Warm heat at startup for 5 - 10 minutes then goes lukewarm. Enough to keep windshield clear but barely. No overheating showing on guage.

Had shop flush the heater core and seemed to be hot air when I left there and drove about 10 miles, but later tried it and it was lukewarm again. Unfortunately I don't know how the flush was done, if it was backflushed or not.

Have seen a couple of posts about the Ts near throttle body and questioning if there could be clog.

Hoping someone had same problem and can share solution.

 

Welcome to the forum

Go back to the shop that did the "flush" they did not do a good job! A shop would have done a complete cooling system flushing and would have seen something that would have indicated either needing more cleaning or a part restricting the flow.

Guessing at why at this point before returning to get a complete proper flushing would be just that "GUESSING"!

 

I gave the solution to my issue in the thread that I started and you entered a reply to:

https://www.mazdaforum.com/forum/maz...e2/#post228710

 

ya and I responded on that bad service advise lol