Do Not Sell My Personal Information Jump to content

Heat Only Part Time


Marty Witt
 Share

Recommended Posts

OK, here is the deal. Even though my 1995 SC400 is completely warmed up, the heater blower will not turn on until I start driving. Then it fires up and the air is warm. If I come to a stop light and stop, it then starts blowing cold. I already replaced the heater control valve and still the same problem. I inspected the vacuum hoses going to the heater control valve and they look OK. I also did a quick test of the the little check valve on the vacuum hose going to the heater control valve. Anyone had this problem before?? Any advice??

Link to comment
Share on other sites

Today I am going to add a little anti-freeze, just to top it off (the guy at Lexus and on this website said that might be the problem?. If that doesn't work, I am going to replace all vacuum hoses and that check valve leading up to the heater control valve.

Link to comment
Share on other sites


My '93 has done this for the past several years. Living in Houston, it really hasnt been a priority, but I'll have to try that. Though, I dont understand how that would fix the problem. Does anyone understand how exactly this works. Water or anti-freeze in the over-flow container isnt really being used... is it? I've also notice that, with my car, this problem comes and goes. Let us know if this problem resurfaces.

Link to comment
Share on other sites

OK, here is the deal.  Even though my 1995 SC400 is completely warmed up, the heater blower will not turn on until I start driving.  Then it fires up and the air is warm.  If I come to a stop light and stop, it then starts blowing cold.  I already replaced the heater control valve and still the same problem.  I inspected the vacuum hoses going to the heater control valve and they look OK.  I also did a quick test of the the little check valve on the vacuum hose going to the heater control valve.  Anyone had this problem before??  Any advice??

also check ur thermostat

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.

Loading...
 Share

×
×
  • Create New...

Forums


News


Membership