Q: My 2004 Chevy Silverado is having cooling system problems

asked by on November 06, 2016

The truck isn't blowing hot air and the truck is over heating I thought it was the thermostats but after checking those they both open and close the way they should it seems what else could be wrong? the pump and radiator isn't leaking and seem to be working right don't know where to go from their

My car has 160000 miles.
My car has an automatic transmission.

Hi there:

On a 2004 Silverado 6.6L Diesel there is a heater hose bypass valve that opens when the heater is activated. Sometimes this component can become stuck due to corrosion inside the coolant lines or a sensor that has either become unplugged or has an electrical short. If the bypass is not working correctly, it could be the source of your overheating and heater issue. However, there are a few other problems including air bubbles in the cooling lines or other mechanical part defects that should be inspected by a professional mechanic for overheating issues.

Was this answer helpful?
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

Get a quote

What others are asking

Engine light is on and will not hook up to diagnostic machine - 2003 Chevrolet Silverado 1500

If the engine stalls during travel, it can cause a hazard for other drivers on the road. If the vehicle does not run, your son should not drive it any extended period of time. The issue could very well be...

Car wont start jumped it ima brake abs lights all on car dead next morning

When the IMA light is on in the hybrid Honda Civic models, this usually means that the battery pack (not to be confused with the starting battery) is no longer charging properly. This is typically is a part that has...

2004 Subaru Forester won't start

Hi there. This is a very common issue on this vehicle. It is typically caused by a bad throttle body. The throttle body motor is a common failure on this vehicle causing the throttle to stop working correctly, and therefore...

Related articles

A Buyer’s Guide to the 2012 Chevrolet Malibu
While While many people thought that Toyota and Honda had taken over the mid-size family sedan market with models like the Camry and the Accord, Chevrolet surprised the whole market with the Malibu. Available with either a four- our six-cylinder...
A Buyer’s Guide to the 2012 Chevrolet Impala
A A true classic, the 2012 Chevrolet Impala may not have all of the latest high-tech features of other sedans on the market, but it is a tried-and-true model with lots of room, plenty of comfortable features, and a large...
How to Replace a Car Surge Tank Hose
Replacing a surge tank hose involves working on the coolant system, which can burn you when the engine is hot. Stay safe by waiting for it to cool.