No heat

[Sawbladz]

I just got my car out of storage and, after finally getting the starter changed, I took it for an extended drive on a cool day. To my dismay I turned on the heat and nothing but cold air came out. It has no other symptoms. My heat gauge reads normal and all the fans work properly. I wish I had more I could descrivbe but that's all there is.

As I remember from last year, the heat worked when it was put away. I searched through about 12 pages of "no heat" and was unable to find anything similar. The only things I have taken apart were on the drivers side of the engine bay. It is possible I left something off but I have no idea where to start looking.

Any help would be greatly appreciated. Thanks

 

[jetjock]

Likely a bad VSV on the water valve. Common problem. Or the vacuum line from the drivers side over to it is disconnected.

 

[plaaya69]

Just like jetjock said check the vsv on the heater control valve. Also you can bypass it.

Also if its not the vsv then check the vacuum lines.

 

[Sawbladz]

You guys are awesome. I went out and looked at my VSV on the bottom of the intake manifold. I guess the old vacuum lines finally gave up because there was a huge crack in one. When I reached to touch it, it fell apart. I will report back if it is fixed tomorrow...it was snowing outside:3d_frown: .

 

[Mr.PFloyd]

You guys are awesome. I went out and looked at my VSV on the bottom of the intake manifold. I guess the old vacuum lines finally gave up because there was a huge crack in one. When I reached to touch it, it fell apart. I will report back if it is fixed tomorrow...it was snowing outside:3d_frown: .

you too! fuck i was working on my subaru in the cold, as soon as i started to see snow, i said fuck this, im going inside.

 

[cjsupra90]

The water valve VSV is what they ate talking about, its attached to the heater control valve on the firwall and the passanger side

 

[Jeff Lange]

Thread moved.

 

[Nick M]

If you run full hot, the cabin will be warmer. If you loop it together, you will have no heat.

 

[shaeff]

heater valve- 87240

see the metal bar attached to the bottom of it? pull it up with the heat on high and the car running. it will allow coolant to pass through the heater core, thus giving you heat. if it won't stay up, check the vacuum line, and if it still won't stay up and the vac line is good, use a wire tie/ zip tie to hold it up until you can snag another from any of the various models of toyotas in junkyards.

-shaeff

 

[CassMori]

Towards the end of this past winter, I developed a similar problem, but it was somewhat erratic at first. It started with the heater taking longer and longer to come on (set in auto mode), until finally it would not blow hot air at all. The valve on the firewall works perfectly, if it is connected directly to vacuum. When the control unit is raised to 85*, I can hear the vents switch over, but no heat comes out. The cold side works perfect.

It seems to act like it thinks the engine coolant isn't up to temperature yet. It would most likely be some sort of part failure or short I would think, as it just suddenly began doing this, and progressively got worse, and I had not done any type of repairs/maintenance (other than oil/filter changes) recently.

Near as I can tell, it could be either the climate control itself (bad amplifier or connection somewhere?), the in-cabin thermal switch (near the base of the A\C unit, supposedly), or the elctronics on the heater valve itself. I also thought it might be the temp switch in the thermostat housing, but I am getting no error code for it. Is there a way to check the electronic part of the heater valve? Is there some other thing I should check, that I have overlooked, that could cause this problem?