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Raulg 09-18-2017 08:43 AM

87 951 No heat - pls help
I have a 1987 951. I tried the heat on a cool morning and no heat.
I checked the vacuum tube to the heater control valve and it was holding vacuum.

I checked the vacuum tube connections at the fire wall and both seem fine.
I then unplugged the vacuum line from the actual valve. When I press the arm that controls movement of the valve internals, and cover the vacuum port with my finger, the arm stays in place and moves when I remove my finger.

Where should I look next?
Is there anything else to check?
Could the control valve be broken internally?
Could the knob/switch on the dashboard be the cause?

Thank you for any advice you can provide

Dmitry at Pelican Parts 09-19-2017 10:11 AM

Hello RG - take a look at the link below to an older thread where this is discussed. Hope this helps and best of luck!

Raulg 09-20-2017 01:54 PM

thank you for your reply.
The thread you provided, indicates that there is a solenoid on the passenger side under the dashboard, that controls the vacuum that activates the heating valve. Apparently, in some cases the solenoid valve (under the dash) goes bad. Does PP list this device?
Would you know the part number?
Thank you for your help

Charlesberry 10-15-2017 04:40 PM

Any luck Raulg? I have a 951 with no heat too.

Raulg 10-18-2017 09:05 AM

So far, I have checked the vacuum tubes and they all appear ok.
I disconnected the tube to the heater valve and it had vacuum however the valve arm would not move when the temperature knob on the dashboard was set to max heat or anywhere in between.

I got a used heater/AC control panel and tested it last night. Still no heat.
I moved the arm on the heater valve and locked it in place with a screwdriver and there was barely warm air coming at the passenger side footwell only. cool air everywhere else.

I have a replacement (new) heater valve that I will most likely replace this weekend although I don't think that is the issue.
I wonder if the current heater valve could be internally broken and no matter what I do on the outside (moving the lever arm) there is no heat.

I have no idea of how to test the "solenoids" under the dashboard near the glovebox. I received a link from Dmitri at PP with information on their location. I requested part numbers but never heard back.

I will report back after I change the heater valve this weekend but it is not looking promising.
Thank you

Raulg 10-23-2017 09:15 AM

I replaced the heater valve near the firewall in the engine bay.
No changes, there is no heat in the car.
The old valve seems to be in good shape, holding vacuum. I though it would be broken internally.
I was wrong.
I have to look at the "solenoid valves" under the glove box.
The problem is that I don't know where to find part number or replacement part.

UncleRay 10-27-2017 06:15 PM

The heat did not work on mine this spring before selling the car. Turned out to be a bad fuse....

Raulg 11-09-2017 09:16 AM

I recently bought used solenoids as per Dmitri's advice. No change, still no heat.
I asked our host about what it could be through their sales department.
The reply I received, suggested that I replace a temperature mixing flap/door actuator motor part #944 624 119 00

When I looked in the PET pages, there are two options. The one ending in 119 00, another with 120 00. The 119 lists 2 motors, the 120 lists 1 motor.
Does anyone know what is correct?
Would this be the last thing I need to replace to get heat in the car?

Uncleray: if the fuse is burned, would the fan still work? The fan works on all speeds.

Thank you all for your help!

Raulg 11-09-2017 09:19 AM

When I mentioned solenoids I meant the electric/vacuum solenoids located between the center dashboard and the glove box.
I am glad I ordered 2 (used) as they came with a harness and connected together. If I had ordered one, I would have had to splice some wiring. It is very tight to get to them and nearly impossible to get to the harness connector. What a pain.

Raulg 11-10-2017 09:06 AM

I went to check the fuses after I read your note yesterday.
My car had been in the shop last summer with an electrical short. The short was found after many days in the shop, to be under the fuse box. The technician replaced/repaired wires under the fuse box and the ignition switch.
When I got the car back, several items were lose, including the steering wheel.

Well, long story short, the #29 fuse for the heating was missing. I took a spare one and placed it in the #29 spot and the heating is back!

The fan always ran, therefore I didn't think of checking the fuses.

Thank you for your advice and your time to chime in. I have spent $ on the heater valve and used solenoids but it could've been worse.

Thank you very much!

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