You.
Should learn.
to use
google.
Or at least how to type a sentence that's full and complete. For future reference, it might also help if you explain what you've done to try and fix it.
However, it it's like 99% of other Supras, you're either suffering a Heater VSV failure, or you're heater core is takin' a shit.
As for the Heater VSV, this page will show you what the Heater VSV is:
http://www.ddmcse.com/turbo/heatervs.html
Here, are two SOGI tips to help you out further:
http://www.supras.com/06/techcenter/display.php?QID=67
http://www.supras.com/06/techcenter/display.php?QID=58
__________________
1988 Mk3 Turbo Targa - 17.5psi, 486hp, 494tq.
[img]http://www.**********s.com/supra/rsw_sig_stupidTN.jpg[/img]
Who came up with this 500px wide BS?