Tacoma SR5 defrost issue

2001 Tacoma SR5
Went to turn on defrost this morning and blowed cool air. Tried switching to my vents and it just blows very very little warm air. Mostly cool air. Any ideas what would cause this ? Thank y’all in advance

 

Does the heater work? IE blow hot on your feet?

 

Very very little if any

 

Does the truck reach operating temperature? Running cold could be a tstat stuck open.

Turning dial to highest heat, directional to dash vents, do you get heat there?

 

Dial is on highest heat and fan is on highest position.. temp gauge shows at normal operating temp…

 

are the Fans still working ? Pushing Air ?

 

Yeah. Fans are blowing. Just cool air.

 

First check the coolant level in the radiator. Check your heater core hoses on the firewall underneath the hood. Let the car come up to temp. and feel the two hoses. If only one of them is getting hot you may have bad heater core or a bad heater control valve

stolen from another form

 

Check your coolant level.

 

If it will blow heat out the dash vents you likely have a stuck or broken blend door.

If you get no heat on any settings you likely have a coolant flow problem. Collapsed hose, clogged core, etc.

If the truck isnt at 180+ temp (check with infrared) the tstat may be stuck open. The dash gauge isnt a reliable measure.

 

Ok verdict so far… both hoses going in and going out of heater valve on fire wall is hot. I can have vents blowing and I have very warm air. I turn knob to dash defrost with or with the floor air and I have cool air. Plenty of coolant. Plus another question what controls the cable connected to the heater valve?

 

Most likely a cable controling the blend door is the problem

 

Also note you are in the 2nd gen forum with a 1st gen problem. Searching there will give you more accurate solutions

 

Nevermind I see the OP is in a first generation...

 

https://www.tacomaworld.com/threads/no-heat.642058

 

Thanks