System has been flushed, new heater core, radiator, heater control switch and control switch on the firewall, thermostat, the air has been purged from system, the vehicle reaches proper operating temp. its gets a small amount of heat when driven, I, m lost!!!!!!!!!!! maybe the impellers are bad on the water pump???????????????? the car did sit alot but only has 75K for miles
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Re: 1989 maxima no heat in vehicle
Put your hand on the heater hoses as close to the fire wall as possible find out if both hoses are hot.Do this when the vehicle is cold allow car to heat up with heater open and running.If both equaly hot then heater core at fault.If different check water supply to cold hose.
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Your vehicle is way past a flush kit. Even if you recently replaced the radiator. If it over heats, you would have to use something heavy duty, Like muriatic or sulfuric acid. Then those would eat up the heater core and the radiator. Both copper and aluminium. If you have no heat, then replace the heater core. I have only come across a couple of engines that needed such a drastic acid solution.
drain coolant system locate heater cores hoses going through firewall you need to buy the radiator flush kit at any auto parts stores. remove heater cores hoses from one end or buy extra long heater hoses same size as heater core hoses in vechicle at auto parts store use the flush kit when you flush through one of the heater core hoses let the other hose drain in a drain pan when you use home garden hose use low water pressure dont use garden hose to the max or you will rupture heater core. your best bet let radiator shop flush whole coolant system. because heater cores hoses are in a tight spot.make sure engine off if you just going to flush out heater core only .after flushing heater core good time to replace heater core hoses.if job too hard or complicated let radiator shop flush out radiator the engine block and heater core because if radiator stopped up or engine block stopped up the gunk and rust will reenter plug up heater core.if you tight on money you can flush out your own radiator.drain out radiator using large drain pan. remove top radiator hose and remove bottom radiator hoses connect to water pump.use garden hose with flush kit part with water pressure not too high put garden hose to top radiator hose run water until clear water run out bottom radiator hose in drain pan,the flush out engine block remove thermostat.if you had another spare thermostat housing with RTV SILICONE SEALANT THAT HAS SET UP INSTALL THERMOSTAT HOUSING BACK TO ENGINE WITHOUT THERMOSTAT FLUSH OUT THE ENGINE BLOCK, WHEN DONE INSTALL NEW THERMOSTAT THEN INSTALL ORIGINAL THERMOSTAT HOUSING WITH NEW ORING WHICH YOU BUY AT DEALERSHIP.IF ALL SOUND COMPLICATED LET RADIATOR SHOP FLUSH OUT COOLANT SYSTEM.
Feel the heater hoses under the hood when the vehicle is warmed up. They should both be warm.
You may also have a valve that shuts off the coolant flow on the heater hoses. The valve may be faulty.
If both heater hoses are warm up near the firewall where they enter the vehicle then you might have a bad solenoid or switch that is not operating the blend air door that moves between the A/C evaporator and heater core.
Feel the 2 tubes at the firewall for the heater core. If they are not getting hot, the heater core needs to be flushed out or replaced. I had this problem with a 1990 Cadilac Deville, it was just a plugged up heater core.
Remember to install sealant after flushing out the system to prevent leaks.
Park the vehicle on a level surface. If the engine has been running allow it to cool completely.
Drain the cooling system. Remove the radiator cap from the radiator.
Locate the petcock valve on the lower corner of the radiator. Place a
waste oil collection pan underneath the petcock valve and turn it
counterclockwise to open. Allow the cooling system to drain completely.
Label and remove the heater hoses from the heater core. The heater
hoses will connect to the heater core in the engine bay, on the
firewall, on the passenger side of the vehicle. Use either the Phillips
or the flat-blade screwdriver to loosen the hose clamps that secure the
hoses to the heater core. Then pull the hoses off the heater core.
Removing the Heater Core
Remove the heater core cover. Move to inside the passenger compartment.
Locate the heater case. It will be bolted to the firewall, below the
dash on the passenger side of the vehicle. Use an appropriate sized
socket or wrench to remove the five screws that connect the heater core
cover to the heater case, and remove the cover.
Remove the steel straps that secure the heater core to the heater case.
Unscrew the four screws that connect the steel straps to the heater
case using a socket or wrench and remove the straps.
Remove the heater core by pulling it out of the heater case.
Installing the Heater Core
Place the new heater core into position inside the heater case. Be sure
to carefully guide the inlet and outlet tubes through the holes in the
Reinstall the heater core retaining straps, by reinstalling the four screws that secure them.
Place the heater core cover into position over the heater case and reinstall the five screws that secure it.
Refilling the Cooling System
Reconnect the heater hoses to the heater core. Slide the hoses onto the
inlet and outlet fittings that extend through the firewall, and tighten
the hose clamps.
Close the petcock valve on the lower corner of the radiator by turning it clockwise.
Refill the radiator with a 50/50 mix of antifreeze and water.
Reinstall the radiator cap onto the radiator.
Run the engine and visually inspect for leaks.
Good luck and take your time, keep me posted and don't forget to rate please.
It sounds like the heater coil needs flushing out or replacing or the heater valve. Look on the engine firewall and make sure the heater valve is opening. If not open it manually and check the heat level. If that produced heat check the condition of the heater vale cable (or vaccum hose).
If u have issues with heatting may be this will help.
1- If the carpet under
the heater core is damp, or if antifreeze vapor or steam is coming
through the vents, the heater core is leaking.Remove it and install a new unit (most radiator shops will not repair a leaking heater core.
1 - If the air coming out of the heater vents isn't hot, the problem could stem from any of the following causes:
The thermostat is stuck open, previnting the engine
coolant from warming enough to carry heat to the heater core. Replace
There is a blockage in the system, Preventing the
flow of coolant through heater core. Feel both heater hoses the
firewall. They should be hot.if one of them is cold, there is an
obstruction in one of the hoses or in the heater core,or the heater
control valve is shut. Detach the hoses and back flush the heater core
with a water hose. If the heater core is clear but circulation is
impeded, remove the two hoses and flush them out with a water hose.
If flushing fails to remove the blockage from the heater core, the coremust replaced.