Vac question

O

OKinNC

NAXJA Forum User

Location

Clayton, NC

• Jun 21, 2005

• #1

First I want to let everyone know I've searched this and found some info, but I still need a little help. I have an 89 Cherokee with a 4.0 and auto trans. Ok here's my question. Coming from the firewall on the pass side are 2 vac lines. one (which is black) goes to the vac canister by the bumper, the other (which is pink) from what I've found in my searches goes to the heater control valve. This one is the problem. I've searched everywhere and can't find this heater control valve. Does anyone have a pic or can give my an specific location for it?

 

G

Grizzley

NAXJA Forum User

Location

North Central Mass.

• Jun 21, 2005

• #2

Follow the hoses out of the heater core right below your "overflow" bottle. It should sit just a little above and behind where the distributor is.

 

Matthew Currie

NAXJA Member #760

Location

Vermont, land of big clay

• Jun 21, 2005

• #3

The controls in the dash are vacuum controls. The vacuum line that branches from the engine should go through the firewall to the controls, and another line from the controls should come back out, to the vacuum controlled water valve in the line near the pressure bottle.

On my 95, the one to the controls is black, the one to the valve gray.

 

R

Runnin'OnEmpty

NAXJA Forum User

Location

Southeast USA

• Jun 21, 2005

• #4

I too have an 89, and the vacuum hose going to the heater control valve is pink. The valve is located directly in front of the auto trans dipstick, in line with one of the heater hoses.

 

Jeff in VA

<---respect

Location

Richmond, VA

• Jun 21, 2005

• #5

requested pic

Here's a pic. Follow the pink vac line to find the valve.
HTH,
Jeff

 

M

Maz

NAXJA Forum User

Location

LaCanada, CA

• Jun 21, 2005

• #6

Runnin'OnEmpty said:

I too have an 89, and the vacuum hose going to the heater control valve is pink. The valve is located directly in front of the auto trans dipstick, in line with one of the heater hoses.

Click to expand...

Ditto. You may be confused by expecting to see a smaller "thingy" as a valve. The heater valve has short lengths of pipe attached to it.

_Maz

 

O

OKinNC

NAXJA Forum User

Location

Clayton, NC

• Jun 21, 2005

• #7

Well now that I know what it looks like I've figured out I don't have one. I traced both hoses coming out of the firewall and they both "Y" off one going to the input of the radiator reservoir tank and the other coming from the output of the radiator reservoir tank and then they go to the front of the engine area. My question is should I plug the vac line and leave it or buy a new valve and put it in?

 

G

Grizzley

NAXJA Forum User

Location

North Central Mass.

• Jun 21, 2005

• #8

Must be awful warm in the truck since the water is flowing constantly through the heater core. I'd buy the valve so that it'd at least stop the hot water from going through the core.

 

O

OKinNC

NAXJA Forum User

Location

Clayton, NC

• Jun 21, 2005

• #9

Grizzley said:

Must be awful warm in the truck since the water is flowing constantly through the heater core. I'd buy the valve so that it'd at least stop the hot water from going through the core.

Click to expand...

That's what I would think too, but it doesn't seem hot at all and when it was cold out the heater worked fine. I'm all confused.

 

R

Runnin'OnEmpty

NAXJA Forum User

Location

Southeast USA

• Jun 21, 2005

• #10

My guess is that the valve started leaking, and someone removed it rather than replace it. If you want the heater and A/C to work properly, I would replace it.......