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Re: weak heat from my 91 honda accord
SInce your car is approaching 20 yrs of age, it's not surprising that the heater core could be clogged. I assume you have checked for a half-shut inline heater valve (if there is one.) HEre's how to test for the clogged core:
locate two rubber hoses going into firewall and clamped to two pipes protruding therefrom. These are your hoses to the heater core and the spouts running in and out of it. Disconnect the two hoses at some place convenient if not at firewall. Then run water hose into one of these tubes. If you have any backflow, or restriction, then you need a heater core.
If this is not a clogged core, BE SURE your hot/cold cable is pulling it's door or valve to the full hot position. Trace it under dash.
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Is it a carburetor or fuel injected model?
Did the slow take off occur before or after you changed the plugs, wires, and timing belt?
If it started after plugs, wires, and timing belt, I tend to believe the timing relationship between the cam and crank has changed (cam and crank are not timed together properly, off by a tooth or two). Unfortunately you will need to partly tear into it again to verify the timing marks used when the timing belt is changed are perfectly aligned.
their are 2 lines running into your firewall to some heating components under the hood, unplug lines at the other end (the components) blast clean water through the line using a garden hose untill blockage is removed. (you'll know when)
Have you tried flushing your cooling system? It sounds like you might have some kind of blockage in there. I had the same problem with my 89 civic and used a prestone flushing kit. It's pretty cheap from AutoZone. Give it a try and let me know if I can help you with anything else. Thanks for an honest rating and for using FixYa.