HEATER WILL ONLY KEEP BLOWING WARM WITH HIGH RPMS

1992 Chevrolet Camaro

Tiny

oldschoolmuscle

January, 12, 2012 AT 10:47 PM

I am having issues with my heater blowing hot. It will work as long as I maintain at least 1,500 RPMs and a decent speed but if it drops then it starts blowing cold air and the engine starts to overheat. I have a feeling it has something to do with the vacuum that controls the heater but not sure if it would be just a line or if it would be the heater control box itself.

FOUND 4701 RELATED QUESTIONS

Heater

17 ANSWERS
11 IMAGES

3 Answers

Tiny

rivermikerat

January, 13, 2012 AT 12:29 AM

With the engine idling and at operating temp, grasp the 2 hoses going through the bulkhead for the heater core. They should be HOT. Check thermostat, make sure it's opening properly. Make sure you can see coolant flowing in the radiator.

Tiny

oldschoolmuscle

January, 14, 2012 AT 1:21 AM

All of that is working properly. It just doesnt want to stay on heat. I just dont know if it would be the selection box or a vacuum line to the box

Tiny

rivermikerat

January, 15, 2012 AT 5:18 AM

Use brake cleaning fluid or carb cleaner to check the vacuum lines for leaks. Make sure the actuators are moving the blend doors properly.

Please login or register to post a reply.

Replace Heater Core
Cabin Air Filter Replacement
Cabin Air Filter Replacement
Blend Door Actuator Replacement
Cabin Air Filter Replacement Honda Civic
Cabin Air Filter Replacement Saturn Vue