Our Community is 705,000 Strong. Join Us.


99 Jimmy Heater Motor?


Eriedipper
01-08-2010, 02:00 PM
I have a 1999 Jimmy. 4.3. 4x4. The heater motor gives out an occasional screeching noise when its switched on. I'm guessing its probably a bearing in the motor?

Does anyone know if the whole heater housing has to come out from the inside, or can the motor be removed from under the hood? Or is there anyway I can try & lubricate the bearing?

You can just see where the motor is by the firewall on the right hand side, from under the hood.

Looks like a big job! :uhoh:

intimadatorsquizz
01-08-2010, 02:08 PM
Disconnect the battery negative cable.
Remove the VCM.
Remove the coolant reservoir.
Remove the rear coolant recovery reservoir mounting stud.
Disconnect the electrical connector from the blower motor.
Remove the blower motor access cover retaining screws. IMPORTANT: Cut through the cover as straight as possible because the access cover must be replaced. Part of this repair is visible to the customer. In order to prevent damage to the component, do not cut any deeper than necessary in order to remove the access cover.
Cut through the cover on the cut line (1) using a razor blade or a sharp utility knife
Disconnect the cooling tube from the blower motor.
Disconnect the electrical connector from the blower motor and fan assembly.
Remove the blower motor and fan assembly mounting bolts.
Remove the blower motor and fan assembly.
INSTALLATION PROCEDURE

Install the blower motor and fan assembly. NOTE: Refer to Fastener Notice in Service Precautions.
Install the blower motor and fan assembly mounting bolts. Tighten Tighten the bolts to 4.5 N.m (40 lb in) .
Connect the cooling tube to the blower motor.
Install the blower motor access cover. IMPORTANT: Do not use RTV. Apply the adhesive bead as straight as possible. Allow the adhesive to set for 15 minutes or until the adhesive becomes tacky.
Seal the cut line using black weather-strip adhesive.
Install the blower motor access cover retaining screws. Tighten Tighten the screws to 2.5 N.m (22 lb ft) .
Connect the electrical connector to the blower motor.
Install the rear coolant recovery reservoir mounting stud.
Install the coolant reservoir.
Install the VCM.
Connect the battery negative cable.
good luck and enjoy

b1lk1
01-08-2010, 03:19 PM
Don't waste your time putting the piece you have to cut back on. Mine crumbled in my hands in places anyways.

1996GMCJimmy
01-09-2010, 05:09 PM
I agree with b1lk1...don bother with the cover, it will crumble to pieces.

Eriedipper
01-13-2010, 10:13 AM
Thanks for the quick reply! I was afraid I was going to have to remove the complete htr housing from inside the vehicle!
It's in the middle of winter here in Canada, & I have to work outside, so I'll leave the repair until spring.

The other morning the htr was screeching as normal, (until it warms up then it's quiet.) I decided to try a quick fix!

I could clearly see the motor housing on the right side of the firewall under the hood. I carefully drilled a 1/16" hole into the plastic housing right in the centre of the heater housing, in the little bump where I thought the bearing might be. I then squirted a bit of 3 in 1 oil into the hole and ????
Instant silence!!! The motor has remained silent ever since. :smile:

I'll keep you posted how long the repair lasts!

Add your comment to this topic!