Chevrolet

Ask a Chevy Question, Get an Answer ASAP!

Have your own Chevy question?

23 Chevy Mechanics are Online Now

characters left:

Not a Chevy Question?

Question

I have a 99 yukon , the temp gage fluctuates to 250 and then back to normal, and the heater is intermittent, i replaced the thermostat but that didnt fix it, what else could be causing this ? thanks

Submitted: 1091 days and 19 hours ago.

Category: Chevy

Value: $9

Status: AWAITING CUSTOMER ACTION

Answer

I assume the "heater is intermittent" indicates that the heater gets hot and then cold. And also assuming the fluctuation of the temp gauge isn't rapid (indicating more a gauge problem than an actual problem). It could be a low coolant level, bad head or head gasket, or perhaps the more likely - the lower radiator hose could be sucking shut. Easy enough to check, with the hood up, idling, at operating temperature, either throttle the engine by hand, or have someone else do it, while watching the lower radiator hose. If it collapses, you'll need to replace it. Check it out and let me know.

Accepts:
Expert:	William
Pos. Feedback:	100.0 %
Answered:	11/27/2006

Auto Technician

7 ASE Certifications, Undercar Specialist, 20+ years exp.

Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Chevrolet

Have your own Chevy question?

Question

I have a 99 yukon , the temp gage fluctuates to 250 and then back to normal, and the heater is intermittent, i replaced the thermostat but that didnt fix it, what else could be causing this ? thanks

Optional Information

Answer

Related Chevy Questions