No heat
#1
Registered User
Thread Starter
No heat
Brrr it's cold. I don't have heat. I have a '97 4Runner LTD 3.4 auto with the manual climate controls.
I checked to make sure I don't have any air pockets in the cooling system. I get hot pipes on both side of the core at the firewall.
With the blower fan running when I switch from cold to hot I get a noticeable reduction in air blowing out of the vents, regardless of which vent position is selected.
I know the blower works, I can hear it and air moves in cold. The A/C works like a champ. Coolant is full.
What can I check before I gut the dash to take the airbox out?
Also it was 4* when I drove to work this morning
I checked to make sure I don't have any air pockets in the cooling system. I get hot pipes on both side of the core at the firewall.
With the blower fan running when I switch from cold to hot I get a noticeable reduction in air blowing out of the vents, regardless of which vent position is selected.
I know the blower works, I can hear it and air moves in cold. The A/C works like a champ. Coolant is full.
What can I check before I gut the dash to take the airbox out?
Also it was 4* when I drove to work this morning
#3
Registered User
There's also the coolant cut-off valve on the firewall, a cable from the HVAC controls is supposed to cut off coolant flow to the heater core when it's set cold enough - is that opening?
#4
Registered User
Thread Starter
As far as I can tell the coolant valve is opening. The pipes get hot on both sides of the valve and both inlet/outlet through firewall.
The blend door sounds like it is clunking. I disconnected the cable on the actuator below the heater box and you can move it by hand with noise/flapping along with movement.
Does anyone have a flow diagram of the heater box? I'd like to try to rig/prop the doors open to force some heat until I can properly get this resolved.
The blend door sounds like it is clunking. I disconnected the cable on the actuator below the heater box and you can move it by hand with noise/flapping along with movement.
Does anyone have a flow diagram of the heater box? I'd like to try to rig/prop the doors open to force some heat until I can properly get this resolved.
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