Question about 1992 Mazda 929

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1991-92 mazda 929 front demister/ climate control


Just had my car at a garage for it's roadworthy cert, where they found a malfunction with the front demister but weren't able to fix it stating it was probably a fault in the climate control modual. Any ideas on how to go about rectifying this problem without it costing the salt of the earth?

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6 Suggested Answers

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

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Posted on Jan 02, 2017

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SOURCE: 2003 Mazda MPV trouble codes

check the pcv hose at the back of the intake manifold it often leaks and will cause several idle problems

Posted on Sep 29, 2008

  • 39 Answers

SOURCE: My Mazda 929 went through a water puddle and now it wont start

I agree with "emissionwiz". What probably happened was you hydrostatic-ally locked your engine. What happens is when you went through that puddle water got sucked into the intake and into the engine. Water being a liquid cannot be compressed and stalled the engine and most likely bent some internal components. If you can hear the starter click but the engine won't turn over you've got a 99% chance its a ruined engine. If you don't want to believe that try turning the engine over by hand (socket on crankshaft), you should be able to turn it, if not it's done for. Good luck and sorry about the misfortune but next time go very slow through puddles.

Posted on Apr 03, 2009

  • 6927 Answers

SOURCE: 1998 Mazda B4000 climate control fan

replace the blower resister mounted in the blower box

Posted on Jun 28, 2009

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SOURCE: MAZDA RX8 2004 Took it out of garage , then put it

Check to see if you are getting fuel to the engine.If not replace the pump relay.Then change the pump if still not working.Check for spark at the wires if you have no spark then change the crank sansor.If still no spark then change the coil pack.

Posted on Jul 19, 2009

  • 2359 Answers

SOURCE: engine malfunction

Check for

vacuum leaks on intake manifold,

the air tube between the air filter.

intake manifold vacuum hose.

clean throttle plate with Berryman carburator cleaner

SEE sample picture HERE

Also remove carbon built up behind the EGR valve and the EGR passage tube.


Vacuum leak WILL offset the intended 14.7 to 1 air fuel ratio.

More un-metered air (leaks) will lean out the fuel mixture.

Use small amount of Berryman carb clearer at potential air leak area will help you identify trouble spot.

At idle,just spray and listen for the RPM surge.

The in-rush of carb clearer will increase the RPM on the motor.

Record the problem spot(s) and address it later.


EGR carbon built up require 2+ hours to clean from start to finish.

You will need a new EGR base gasket before your start.

Locate and remove the EGR valve after the vehicle is cool down.

Carefully record the connector and vacuum line (for older vehicle) location by drawing an easily to follow diagram.

Remove the EGR valve.

Inspect the location of the carbon built-up inside the valve and the EGR passage tube.

SOAK these areas with WD-40 spary.

You will need a small screwdriver,cloth hanger and lot of newspaper and time to get this cleaning done right.

RE-SOAK the carbon and let it sit for over-night will also help.

One the last round,pass a shop vacuum of the EGR valve and the passage pipe.

Install the new EGR gasket and connectors.

Allow the vehicle to warm up outdoor to burn up any remaining WD-40.

Take it for a test drive.

Please rate my answer if it's useful to you.



Posted on Dec 19, 2009

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1 Answer

The windscreen demister button will not go off, my temp gauge is moving up and down and the external temp gauge show -----

A defogger, demister, or defroster is a system
is this the front HVAC defrost mode.
or the rear electric defogger. (heater element grid)
what temp gauge (engine>?) no car has climate controls. advanced.
external? (part of climate controls right) not a hand test tool.

my guess this is HVAC master, climate controls. are all the above.
these are complex on newer cars,
to fix such a complex device ,you need the FSM.
or at the least an account on
check fuses. and read the FSM.
the FSM walks you through each fail and test steps.

on my car, it's a cable and a water valve, and a cable damper.
on your car is up to 3 complex, damper motors
and electronic thermostatic control and sensors.
vastly complex to mine. I can fix both but not with out the book.
what a tech does is , check power to the contoller first.
bad fuse, bad wires bad grounds, we use a DMM and measure the voltage at the controller, this is first.
then we check for loose connections.
i work the simple fails first (mil rules) this can find a simple problem
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so the air temp sensor external, (real name) we work that first
i test the sensor voltage. is it spec, and right for current temp?
y/n, yes, then the controller is bad.
no? sensor bad, or power source to the sensor is bad.

that is how we fix electronic controls
1: power good.
2: inputs "
3: outputs."

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Hope this helps; just keep in mind that your feedback is important and I'll appreciate your time and consideration if you leave some testimonial comment about this answer.

Have a nice day and thanks for using FixYa.


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I hope helps with this (remember rated this help) Good luck.

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