Q: overheating no cooling fans

asked by on August 26, 2016

Repaced water pump sensor worked wen jumped at fuses fans an ac came on wen hot wired would come on got new relay nothing... anyidea pcm ect ??? Thanks

My car has 190000 miles.

Car is overheating Inspection $79.99 - $89.99 Get a Quote

The relays are turned on by the Powertrain Control Module (PCM) by grounding the control wire of the relays. The PCM needs input from the engine coolant sensor above the water pump to sense whether the engine is overheating before it triggers the fan.

You need to diagnose your overheating issue by scanning the engine to see whether the coolant sensor is defective, or the PCM is not grounding the fans.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

What others are asking

Power loss

Having your car lose power is never a pleasant experience, especially if it is in a location where it cannot stay. There could be a variety of things that can cause your Chevy Colorado to experience a loss of power....

Engine wont stay running until warm.

Hi there. Check the fuel filter to see if it's clogged and not pumping enough fuel. If the fuel filter is good, then the fuel injectors could be leaking causing the intake to flood or the spark plugs could have...

Car is overheating and leaking antifreeze.

Besides the item you listed you would need to have the intake manifold, head gaskets, hoses checked. This engine has had all of these components fail. Your cooling fans will need to be checked for proper operation also. My recommendation...

Parasitic drain 2005 tahoe on ignition a fuse

Hello, thank you for writing in. Great job on the electrical testing thus far! A wiring diagram for the vehicle will work wonders for you if you can obtain one. If you are referring to the ignition switch fuse, then...

Car overheats and no heat 2004 Nissan Cube3

Hi there - your symptoms may describe more than one problem. A weak water pump could cause inadequate water circulation that is causing both overheating, and poor heater function. The engine overheat, but not heat until you rev the engine...

Slip's out of gear

If the filter has never been changed you could try that. When cold, debris has dropped to the pan. Once you start the vehicle, the filter screen can get blocked as fluid is drawn into the filter by pump suction....

Engine modification

Sounds like a nice build. Assuming you used the 305 crank, the engine will still be called a 5.0 or 305, since that is the cubic inch displacement of the engine.

Lost first and second gear

Due to the design of this vehicle it is common for the shift linkage connecting bushings to fail because they rot out and bind until they come apart. When this occurs the shifter cannot properly move the shift mechanism inside...

Lose of power when running, and the tac stopped working.

Hello. The vehicle likely stalled due to a lack of gas, or a poor air fuel mixture. This is what caused the drop in RPMs and for the tachometer gauge to drop. The first thing to do is turn the...

Related articles

How Air Bags Work
Designed Designed to protect the occupants of a vehicle in the case of an accident, air bags inflate when the vehicle collides with another object, or otherwise suffers a sudden deceleration. Absorbing the energy of the impact, vehicle owners need...
How to Buy a Good Quality Cooling/Radiator Fan Motor
Fans Fans are necessary to keep the components under your car’s hood from overheating. Excessive heat can cause warping, melting, and other damage, not to mention the additional energy suck. The radiator is one of the hottest parts in the...
How Air Bags Work
Designed Designed to protect the occupants of a vehicle in the case of an accident, air bags inflate when the vehicle collides with another object, or otherwise suffers a sudden deceleration. Absorbing the energy of the impact, vehicle owners need...