no heat..not VSV

[supratkfy]

ok i routed the heater VSV vacumn line directly about year and half ago since it went bad and i needed the heat....everything worked fine,,,it constantly blew hot air like all of you guys said....

but recently my car died out on me and i tried to install a MAFT and AFC....so all i touched was under the glove, and ECU componets, and wired some stuff thru the firewall near the VSV hoses...i rechecked all the vacum hoses running to it but its all connected....i have no hot air in the cabin when its set at 85...agian before it did do it but i haven't really driven the car much so i didn't know when it stopped blowing hot air until today when i noticed it...

anytihng under the glove box that would have messed it up? or do u guys think its the heater core?

 

[Nick M]

Does it not blow air, or is the air not warm?

 

[isnms]

look to see if the plunger is actually being pulled up on the heater valve.

That said; Thankfully, very recently, I was informed that the check valve should remain in line. The heater vacuum valve should not see positive pressure. I reworked my image to show the correct way to bypass the heater vsv.

 

[againstdawall06]

maybe your climate control, or the wiring to it.

 

[maitai69691]

im missing the vac line to the vsv so i cant even bypass where does it come from befor the vsv

 

[isnms]

comes from that empty 'T' spot at the firewall in this pic

 

[mrnickleye]

Get a vacuum source from any hose and hook it to the heater water control valve. Check to see if the valve is opening and closing by putting on and taking off the vacuum hose.
(you DON'T need the check valve at all, ever)

If the water valve seems to be working, leave the vacuum line on and with the engine all warmed up, and temp control set to 85* and fan on low speed, you should feel the hoses going into and out of the heater core to see if coolant is flowing. The outlet hose is near/below the EGR valve, coming out of the firewall.

If the outlet hose does not get real hot, then the valve or core MAY be clogged up.

If the hose is real hot, then I it may be that the vent flappers under the dash could be stuck in a position that does not allow air to flow thru the core.