Any ideas out there why my heat won't work other than a bad heater core?
Thanks

 

Besides a bad heater core, there could be a multitude of reasons as to why your heater doesn't work.

Your heater core could simply be plugged. Gain access to your heater core by removing the dashboard, removing the dashboard support pipe,
removing the 4 mounting bolts, and then removing the heater assembly. (pictured in this '92 Accord heater diagram)
After that, remove the heater core cover and put your hand on the fins of the core. If only some are lukewarm than the core is clogged.

Another possible cause for the lack of heat could be a bad thermostat, bad heater switch or even a low coolant level. Check your coolant level to ensure that you are within the specified acceptable range.


Good luck man!

 

Check the water valve. It could be stuck closed or check the temperature control wire. It could be broke.

You can try to manually move the water valve and see if the heat comes on.

 

+2 that's the first things I'd check too. Those control wires on the rotating heat control **** are constantly getting tight and needing lube. While I was changing out the radio/cassette deck in mine for a new CD/HD radio deck I got in there and lubed the control wire and the switch box for the different heater/air vents. You can tell when it gets sticky. The buttons take a few pressings back and forth before the vents compy and light comes on.

 

Before doing all this work for nothing you can just warm up the car(the fan should start) (don't forget to make sure that system is full, bled, the coolant mixture and acidity level are correct),put the selector **** to FULL HOT position ,pop the hood open and touch inlet and outlet hoses to heater core.They should be at the same temperature.By that you will check if the valve is working or not and if there is a flow through the heater core and if the control **** is working.Post after.

 

Yup. Check your Heater Valve near the firewall just right under the TB. Those are known to get stuck and if it's stuck closed, there won't be no heat.

 

Thanks to all of you I'm giving it a try.

 

is it just the heat or is it the water temperature too

 

The water temp is ok. I lubed up the control valve it was tight and rusty. We'll see if that does it.

 

^This was my problem, too. Those cables can be a pain.

 

Fixed!! stuck valve
Thanks