heater output problem
My heat output is great for the first month or 2 after I flush, then it starts getting weaker down to just luke warm..
Ive flushed 4 times, once using one of those rad cleaners.. Good flow threw the heater core..
I did use the prestone and not zerex.. I think there would be more posts and problems about this if that was it?
Temps are fine, warms up ok, never overheats. Sitting at a red light, 95 degreee weather, never went over 210..
Tried a new thermostat, I really dont think its the water pump, because temps are fine, but the heat does improve if I get the rpms up. Im confused, help!
Re: heater output problem
Are you sure that there is no air left in the heater core? No bubbling noises when you rev the engine?
I red once about corrosion/erosion which had eaten away a part of the aluminum of the timing chain cover, causing a similar problem as you described. Donīt say that this is your problem.
Can also be that the waterpump efficiency went down due to wear, but would expect higher engine temps then as well.
My first try would be removing the waterpump and check the condition. You would at least need a new seal or just change it with a new pump, to rule out this possibility.
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