Question about 1988 GMC Jimmy

1 Answer

We have a 1988 GMC K-5 blazer that the heater only works part of the time. Some times it will blow out air and some times it will not. I am thinking it is probably the blower motor. Where about in heater assembly is the blower motor located?? Thanks.

Posted by on

  • hartman1984 Mar 12, 2009

    The blower motor for the heater and AC are not one in the same are they?

  • hartman1984 Mar 12, 2009

    Thank you so much for the info, much appreciated.



1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 10 achievements.


    An expert that got 5 achievements.


    An expert whose answer got voted for 500 times.

  • Master
  • 1,201 Answers

The blower motor should be located on passenger side under hood, attached to firewall with little screws.

Posted on Mar 12, 2009

  • Richard Delahant Mar 12, 2009

    Yes, the same motor is for the ac and heat. There are vaccum operated diaphrams under the dash that switch from heat to cool air when selected to do so. Some of them are operated by cables.



1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya Mechanic can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repair professionals here in the US.
click here to Talk to a Mechanic (only for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

2 Answers

My heater works but wont blow out any vents. replaced blower motor

Under your hood, passenger side bolted right in the middle of your air conditioning unit is a lone relay screwed in with 2 screws. That was the reason my 92 Blazer wouldn't blow 99% of the time. Knew it wasn't likely the motor since mine worked sometimes, and motors usual are just good or bad. The low/med/high fan speed switch has a resistor in it that can also go bad, I changed that 1st, no change, swapped out that $6 relay and now I have a fan again :) Those are really the only 2 things causing your problem unless your wiring is a wreck or something unusual. Bonus: relay's a 5 min fix taking your time.

Nov 29, 2010 | 1992 Chevrolet S-10 Blazer

1 Answer

Air conditioner charged won't blow cold air, heater core will not let cold air enter into the vehicle. If I close off the heater it will blow cold air. Heat blows all the time even in off postions

It sounds like you either have bad controls or stuck dampers in your vents. The stuck dampers are usually caused by plant debris getting in to the air system.

Jun 07, 2010 | 1998 Chevrolet Blazer

1 Answer

Heat not working on 98 gmc jimmy. Replaced thermostat, checked fluids. Blows air but no heat. Have automatic temp controls and when put on auto nothing at all comes through vents but if put back to manual...

Flushing the heater core is fairly easy just remove the 2 hoses going to the heater core and use a different hose if you have to and use a garden hose to backflush the blockage out..this may take as much as 5-6 times also check for vacumn lines missing or disconnected or breaks pinched ect... some where in the vicinity of the passenger side under hood by the a/c lines ect. good luck hope this helps

Dec 06, 2009 | 1998 GMC Jimmy

1 Answer

My a/c is not blowing cold air and heater is not

I know this problem well, it is caused by a failed air temperature control blend door actuator motor or a stuck bleed door in the heating and ac duct, to replace this part requires you remove the dash assembly, there is no other access provided, this not for the home mechanic, it is very time consuming nd requires a good knowledge of repair work to complete the job, a factory repair manual is a must, not Haynes or Chilton, they will not do the job, not detailed enough.

Oct 22, 2009 | 2000 Chevrolet Blazer

1 Answer

Speedo cable won't work. Replaced cable 5 times,

see if there is a common place where the break occurs. It could be that when you replace it it is kinked somewhere when passed through the chassis. If its always at the head it may be the clock itself has a gear that jams. Try putting some oil down the outer tube before replacing

Apr 27, 2009 | 1988 Chevrolet Blazer

1 Answer

Heater with an attitude on my 1995 Chevy Blazer

It sounds like you have low engine coolant levels or air trapped in the coolant.

Jan 25, 2009 | 1995 Chevrolet Blazer

1 Answer

Heater quit working

some of the vacuum lines got disconnected under the dash that controls the heater box and the water control outside

Jan 25, 2009 | 2001 Chevrolet Blazer

2 Answers

Heater temp control not working

We had the same problem in our 98 GMC Jimmy. Was blowing hot air everywher with everything shut off & air conditioning would not work. We found out it was the Blend Dood Actuator, it is located behind the glovebox. We purchased one on EBay & replaced it and are back on track again. Good luck!

Dec 13, 2008 | 1998 GMC Jimmy

1 Answer

Heater problem

I had one of these at my shop recently and I fixed it by replacing the heater control panel. I went for the resistor first with a known good one and it didn't take care of it. I bought a new heater control panel and that took care of the problem.

Oct 07, 2008 | 2002 Chevrolet Blazer

Not finding what you are looking for?
Cars & Trucks Logo

Related Topics:

152 people viewed this question

Ask a Question

Usually answered in minutes!

Top GMC Experts


Level 3 Expert

77499 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22306 Answers

Ronny Bennett Sr.
Ronny Bennett Sr.

Level 3 Expert

6927 Answers

Are you a GMC Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides