I have no heat when driving fast
2 Answers
I would check your coolant level first. Do you have any leaks in the system?
beatupchevy answered 4 years ago
Could be an air pocket in the system , does the temp. gauge reach operating temp. and stay there ? If not the thermostat could be bad , some are junk out of the box so you may want to buy OEM then you won't have to deal with the nonsense I had to with cheap parts ,