Heater deforster problem

Tiny
ELLEGEE
  • 1992 HOLDEN UTE
  • 24,000 MILES

92 vp ute heater/demister not working. Hot air comes to cab but when I operate demister control air does'nt come through vents.

Do you
have the same problem?
Yes
No
Friday, May 4th, 2012 AT 8:21 AM

9 Replies

Tiny
MHPAUTOS
  • EXPERT
  • 30,751 POSTS

The bi level control is vacuum operated and often on the older commodores and utes the vacuum switch and or hoses are at fault, listen under the dash drivers side next to console for any hissing noises.

Was this
answer
helpful?
Yes
No
Friday, May 4th, 2012 AT 1:11 PM
Tiny
ELLEGEE
  • MEMBER

No hissing noises apparent. Hoses appear to be connected correctly and in good order. Noted that when I remoyed hose connector from switch should there be air emmission.

Was this
answer
helpful?
Yes
No
Tuesday, May 8th, 2012 AT 12:43 AM
Tiny
MHPAUTOS
  • EXPERT
  • 30,751 POSTS

There should be vacuum, check the hose (small) going through the fire wall and hooking into the inlet manifold at the rear, that is the vacuum supply line.

Was this
answer
helpful?
Yes
No
Tuesday, May 8th, 2012 AT 2:50 AM
Tiny
ELLEGEE
  • MEMBER

Found a disconnected vacumm hose at front left side of engine, but darned if I can see connection nossle.

Was this
answer
helpful?
Yes
No
Tuesday, May 8th, 2012 AT 4:22 AM
Tiny
MHPAUTOS
  • EXPERT
  • 30,751 POSTS

Just been re thinking, have a look around the throttle body underneath and at the rear, been a while sine I did a VP, check the length of the hose and see wher it lays around the manifold, I will still try to find the exact port in a manual and re post.

Was this
answer
helpful?
Yes
No
Tuesday, May 8th, 2012 AT 7:04 AM
Tiny
MHPAUTOS
  • EXPERT
  • 30,751 POSTS

Just had a thought, I think the VP had a vacuum accumulator under the front of the L/H/ guard, so lay the loose vacuum hose along the fire wall and you may find the rest of the hose going to the accumulator, I will check further.

Was this
answer
helpful?
Yes
No
Tuesday, May 8th, 2012 AT 7:07 AM
Tiny
ELLEGEE
  • MEMBER

Doesn't appear to be anything for this hose to connect to. Car is 5.0 ltr v8 model with gas conversion. When blocked hose off I got vaccum to the fitting at the switch fitting, but when I hooked back up still no function of settings.

Was this
answer
helpful?
Yes
No
Monday, May 14th, 2012 AT 2:27 AM
Tiny
MHPAUTOS
  • EXPERT
  • 30,751 POSTS

Your in luck, I just had a 5 litre VP booked in for later to day, when it gets here I will have a look at the system.

Was this
answer
helpful?
Yes
No
Monday, May 14th, 2012 AT 2:39 AM
Tiny
MHPAUTOS
  • EXPERT
  • 30,751 POSTS

It just got towed in. On the L/H side of the fire wall there is a round rubber grommet with one vacuum hose and below that a small pipe (part of the A/C system) the vac hose run along the L/H guard behind the strut tower and it goes to the vac accumulator under the guard, a second vac hose is seen here as well that is the vac line that runs to behind the inlet manifold, problem will be that as this also has gas, all the coolant hoses make it very difficult to see wher it actually goes, I think that this car has a stuffed distributor so if I have to take it out later to day I may see some more. Stay tuned.

Was this
answer
helpful?
Yes
No
Monday, May 14th, 2012 AT 3:10 AM

Please login or register to post a reply.

Other Heater No Heat Questions