Jump to content


No Heat


Lexuses71

Recommended Posts

What would cause my climate control to not generate any heat after setting temperature to 73 degrees and vent closed on recirculate?

Just started this 2 days ago. MY car is a 1998 LS400, 84K miles. Very well maintained. Car is not overheating. Just looking for ideas and comments, thanks.

Link to comment
Share on other sites


The first thing to come to mind is that your coolant level is too low so you should definitely check that before going any farther. When I have my heater on that low I really don't feel the heat so I keep it up around 80. If those suggestions don't help I would think that your thermostat is stuck in the open position and might think about changing it.

Link to comment
Share on other sites

Thank you, Sha4000. That makes perfect sense. I will certainly check the coolant level before going any further. And the Thermostat is likely overdue to be changed anyway. Fingers are crossed. Appreciate the feedback!

Link to comment
Share on other sites

I believe that all the way up is full heat. With the valve wide open, you should feel both hoses being very warm to hot. That indicates that coolant is flowing.

You might have to disconnect the cable to move the lever all the way up. That cable is controlled by an actuator and I suppose it is possible for that to be inoperable.

Link to comment
Share on other sites

I'm not sure but if the actuators are vacuum controlled a leak in a hose could cause that valve not to be moved to. If low coolant there will likely be an air lock going on too. Air in the system will block the coolant flow.

Link to comment
Share on other sites

sorry to be slow getting back, heat was what I was referring to, I didnt elaborate since you were questioning heat, my thoughts were the INLET would be hot, and the OUTLET (going to the heater core) would not be hot since you posted lack of heat.. and you could see the range of the lever and even see it operate as you change your dials, just go to HOT and back to COLD to see it operate..

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.



×
×
  • Create New...

Forums


News


Membership