Do Not Sell My Personal Information Jump to content

Heater. Not As Hot As It Should Be.


Recommended Posts

Do you notice it is colder when you come to a stop?? Add a little anit-freeeze!! Mine would blow cold when I came to a stop and warm when I began moving. Someone on this site said to add a little anti-freeze. Even though the level looked OK, I added about a pint and a half and voila, it blows warm when stopped. But, it also blows warmer when I'm moving also. So, double check your anti-freeze and possibly add a little juice.

Link to comment
Share on other sites

Thanks. I will look into both suggestions. However, I added antifreeze just the other night. I filled up the coolant reservoir and topped off the radiatior as well. Same deal, just mostly cold air and intermittent warm air.

I also did a general search thru the net and most people suggested:

1. clogged heater core.

2. blown head gasket.

3. faulty thermostat.

hmmmmm.... I hope to God it isn't #2!

BTW, do you guys think that me recently switching from fossil to 10W30 synthetic oil is related to this new problem? The car has about 120K miles on the odo.


Link to comment
Share on other sites

  • 1 month later...


the heater control valve on this car is has an electonic VSV valve. They do fail. Apply vacuum directly to the valve and it should blow hot air. If it does, buy a new VSV valve

I am putting my money on a "malfunctioning thermostat." I have replaced MANY over the years for the same reason you mentioned.

Link to comment
Share on other sites

I agreed that it's most likely the heater control valve. It's common on earlier SC's. First inspect it for any external leaks, then check if the linkage is out of adjustment, which may cause the valve to open up all the way, then perform the vacuum test as recommended by Mehullica.

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.

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...