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The first three speeds you get nothing....it only operates on high #4 speed and it is a little bit noisy

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IF ITS AUTOMATIC TRANSMISSION. THROTTLE VALVE CABLE NEED ADJUSTMENT OR COULD BE THE GOVERNOR PROBLEMS LIKE VALVE STUCK GOVERNOR WEIGHTS BINDING. GOVERNOR DRIVEN GEAR DAMAGED OR.BURNED DIRECT CLUTCH PLATES.THE 1-2 3-4 SHIFT VALVES STUCK IN VALVE BODY. IF IT MANUAL TRANSMISSION SHIFT LINKAGE OR SHIFT FORK OUT OF ADJUSTMENT OR WORN DAMAGED OR I- 2- 3 GEARS AND BEARINGS WORN OUT.

Posted on Jul 16, 2010

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My car 2008 Chevy Uplander warning light came on stating A/C shut off for engine protection. My question exactly as 1posted 2011. Gauge not Reading. Fan running continuously. Doesn't seem hot.


What gauge not reading , Temperature ? you posted back in 2011 ? You did feel you should take it to the repair shop ? You need to take this to a ASE certified repair facility ! This is a complex electronically controlled cooling system , Three relay's controlled by the ECM -engine control module turn the fans on in two different speeds ! There could be DTC'S diagnostic trouble codes stored in the ECM, HVAC module , BCM !
Circuit/System Description
The engine control module (ECM) commands the fans ON in high speed or low speed. In low speed, the fans are configured in series. In high speed, the fans are configured in parallel.
In low speed operation, the ECM applies ground to the coil side of the low speed fan relay, which is the Fan 1 Relay. Voltage is applied directly to the left cooling fan through the switch side of the low speed fan relay. The right fan is connected in series to the left fan through the de-energized Series/Parallel relay, which is Fan 2 Relay, so that both fans operate at low speed.
In high speed operation, the ECM applies a ground to the coil side of the low speed fan relay, the Series/Parallel relay, and the high speed fan relay, which is the Fan 3 Relay. Voltage is applied directly to the right cooling fan through the switch side of the high speed fan relay. The left cooling fan obtains voltage through the low speed fan relay and ground through the Series/Parallel relay.
When the ECM is commanding a fan relay ON, the voltage of the control circuit should be low, near 0 volts. When the ECM is commanding a fan relay OFF, the voltage of the control circuit should be high, near battery voltage.
One of the relays could be stuck on ! An for the gauge you have to have it removed an fixed , there is a stepper motor behind the gauge needle an they go bad ! Or replace the instrument cluster !

May 14, 2015 | Cars & Trucks

1 Answer

Air only blows out defrost vents VERY LITTLE


There is a cabin air filter in the unit. The filter is behind the glove box. It slides out.

Mar 03, 2014 | Buick Cars & Trucks

1 Answer

My car is running hot, and I dont know what to do.


{: ) You didn't mention the model of your vehicle. Anyway, we can try some cooling system basics.
You can begin checking with the things that keep the engine cool.
1. The coolant. Are you using plain H2O? Check the coolant level and also look for signs of coolant leaks.
2. The radiator. Check for obstructions at the radiator area like plastics and debris. Foreign materials could have accumulated on the radiator fins. Clean if necessary.
3. Cooling fans. Check for damages or cracks. Is it operating at expected speeds when it should be? For example, at 106deg it works on low speed, at 110deg it should spin high speed. If it stays on low speed all time or none at all, check the fan relays and fuses.
4. Water pump. Is it noisy? Have you checked the belt? It may be old and cracked, better replace it. If a thermostat is stuck, coolant won't circulate and engine will heat up fast to undesirable levels.

How about the other things that add more heat to the engine?
1. Engine pulleys getting stuck. A/C, water pump, steering pump, alternator, idler and tensioner pulleys.
2. A/C system high pressures on the condenser.
3. Oil level and pressure low
4. Poor engine emissions performance. Engine timing, tune-up, clogged exhaust pipes
5. Stuck brakes or bearings
6. High ambient temperatures
7. Poor wheel alignment, low tire pressures

I hope I didn't miss out on any other more important things to include. Wish you goodluck.

Jul 24, 2011 | Buick LeSabre Cars & Trucks

1 Answer

I would like to know how I can fix the heater in a 89 gmc k1500 with a 350 engine and no air. I tried a new heater motor and still not working. The Fuse is also good.


This is a blower motor not working tip I posted a little while back.

Blower motor problems are a pretty common topic. This is a basic guide on how to diagnose the problem and will work for most vehicles.

The diagram is generic and loosely based on GM's setup and more specifically a Silverado. Most manufacturers have a similar setup and the only major differences would be a ground side control (instead of the switch supplying power to the resistor it would be grounding the power from the resistor if this is the case you test light would need to be connected to power to test the switch) and late model Chrysler minivans (they use a module that looks for a difference in a/c voltage from the switch)

If the blower works on high only than likely the resistor assembly is the culprit since power to the blower essentially bypasses all of the resistors and/or the resistor assembly entirely. The reason why none off the other speeds will work is that the resistor or the circuit for the speed four setting has burned out. The lower the setting the more resistance you need to drop the voltage to the blower. The first speed setting requires all four resistors to drop the voltage enough to turn the blower at its slowest speed. Speed 2 needs to turn the blower a little faster so it uses three resistors. Speed 3 uses two resistors and speed 4 uses one.

In some cases the fan will work on high and speed setting 4. The likely cause for this is the speed 3 resistor or circuit has burned out. Speed 4 still works because it doesn't use the lower speeds resistors to control the speed of the blower. If the speed 2 resistor burns out than speed 1 and 2 will not work but 3, 4 and high will continue to work. If the speed 1 resistor burns out than speeds 2, 3, 4, and high will continue to work.

This leads us to how do we know if its the resistor or the switch or the blower. If the blower works on high than we know the blower works. That leaves us with either the switch or the resistor assembly (there are many other possibilities) which can be easily tested with a test light (or a voltmeter if you choose) The first thing to do is locate the resistor assemble. They can be behind the glove box, under the dash close to the blower motor or under the hood, again usually close to the blower motor. It will typically have 5 to six wires going to it. We'll start by unplugging the connector, turning the key on and connecting your test light to ground.

1.Turn the switch to high and backprobe all the wires. Two of them should illuminate the test light. In the diagram below this would be wire E & F. If you don't have a diagram then hold the test light on one of the two wires and move the switch to another speed setting. the wire that continuously illuminates the test light regardless of the switch position will be the constant power for high blower speed and will not need to be rechecked in the following steps.

2. Turn the switch to the next lowest setting. Backprobe the remaining wires to see if one of them illuminates the test light. Repeat until you have checked all of the speed settings.

3. If the test light has illuminated a different wire for each setting then we can reasonably assume that the switch is functioning as intended and the source of the problem is the blower resistor.

If you find one or more settings (but not all the settings) on the switch that does not illuminate the test light on any wire than we can reasonably assume that the switch has failed.

There are a few other things that can cause blower motors not to work as intended. The switch or the resistor assembly are the two most common problems.

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Nov 09, 2010 | 1989 GMC Sierra

1 Answer

Can't find cooling fan resistor which i was told was located on the fan body. Low fan does not work...have replaced coolant switch at bottom of radiator. High fan comes on when heat gauge is about 3/4....


hi craig cooling fans on those cars have two or three connection wires. two wires means one speed. three wires means two speeds. they work with extra poles in the motor, not with a resistance. when you have a motor with 3 conn. wires and only one speeed, you have to replace the motor. most types haves only one speed. extra speed fan motors where optional for extra heavy duty or high temps. if you have more questions let me know. greetings.

Feb 22, 2010 | 1987 Volkswagen Cabriolet

1 Answer

95 wrangler yj. has no power at high speeds


Have you had fuel pressure tested, and/or filter changed. Have you checked for plugged exhaust, such as catalytic converter? Quite often engine will also run a little hotter than normal when exhaust is plugged.

Nov 05, 2009 | 1995 Jeep Wrangler

3 Answers

Car droning noise


While you are driving, get up to roughly 40 MPH on a road with little or no traffic. Once at this speed, whip the steering wheel left and right as if you were making rapid lane changes. If you notice a change in the pitch or intensity of the sound, it is quite likely that you have a pending wheel bearing failure. The reason that the change will be noticed is because there is a rapid change in load placed on the bearings during lateral moves. Outside of the, the tires alone, can be quite noisy. I drive an old 1981 Mercedes 300TD wagon. I never realized how much road noise was coming from my tires until I replaced them with new ones!

Apr 06, 2009 | 2006 Kia Optima

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