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Re: no heat in 93, 454 heater
If you haven't already, try replacing the thermostat located on your engine's intake at the upper radiator hose. If that doesn't work, it may be in the control pannel for your heat on your dashboard, causing the heat switcher in your air box not to switch. Also check the cable on the air box, as sometimes when you do a heater core the cable may not be exactly back in place, or it may have been bent.
Hope this helps
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It is likely that the heater core has sprung a leak, or the hoses leading to the heater core have failed. This would cause a loss of coolant that would make the coolant temperature sensor think it wasn't necessary to turn the fan on, and would cause steam to appear to rise out of the back of the engine. If you turn the heater on inside the passenger compartment and get steam through the vents, it's DEFINITELY a heater core breach. Otherwise, check the hoses leading to the heater core and make sure they are still connected and not leaking. Good luck!
could have faulty thermostat.make sure engine coolant level not too low.if all is good you could have clogged heater core or heat control mode temperatue control switch faulty or the heater control cable or air door actutor not working.
No hot air is due to low coolant, or even poor coolant flow. The engine heats up the coolant, and it passed through your heater core, and the heater blower motor pushes air through the heater core to warm up the air. If your "fan"is working, but the air is cold, make sure your coolant level is good.
If the heater core is not damaged or leaking ie: if you don't see coolant on the INSIDE of your windshield or coolant on the floor inside the car then chances are you may just need to BLEED the radiator.
remove radiator cap
Fill coolant resovoir to the cold line if the engine is cold from sitting overnight.
Start engine with cap off
Wait till engine gets hot
While waiting you will see a big gurgle of air bubbles come out and the coolant level will drop
Fill the radiator with more coolant to compensate.
When the fans come on and it stops gurgling air install the radiator cap
You are done
Watch the coolant level for the next few days and top off in the resovoir as needed to keep it filled.
Your heat should be very hot now providing you installed the correct oem thermostat correctly.
Could be the diverter valve. It's the one located near the firewall in the engine bay. The valve is in-line on one of the two coolant hoses that run through the firewall. Have a helper rotate the temperature knob back and forth, with the ignition turned on, and you watch to see if the valve is being adjusted. I'm guessing it isn't. Sometimes the cable pops off its perch, other times someting is broken on one end of it or the other. Plastic parts are often used in this assembly. Best of luck
when the level of coolant drops in the motor the heater core is the first to be without
because it sets up high
so you need to check the level
and check where the coolant is going
to make the level drop
Is the fan working and blowing air but there is now heat?
If there is no heat and air is blowing out check your radiator level. If the engine coolant is too low water will not get to your heater core. Remeber check the radiator level and not just the coolant reservoir. Becareful when working around a hot car. wait til the car cools down to check the level of the coolant in the radiator.
There is a valve that allows heated water to flow through the heater core when you select heat on your controls. This valve should be located under the hood and one of your heater hoses should run to it. Your valve is stuck or failed for some reason. Check it out.