engine

al Asked:

Why does cold engine make noise when ac is turned on, but okay after engine is hot

Answer this question

Liked this question? Tell your friends about it

Facebook Windows Live Yahoo Twitter Digg Google del.icio.us Reddit

Link

Embed

Copy and paste the text above to share this Q&A

3 Answers

Order by: Oldest to Newest; Newest to Oldest; Votes

Nanadee Answered:

Its just like the first time you start the car during the day,

It has to warm up.

Posted 2 years ago

A penny saved is a penny earned

Add a comment

Helpful? (0)

Report

Jack Answered:

Nanadee it propably right. A cold engine has to work hard, but when it warms up everything works better. How many miles on the car? If it's new this answer is correct. If it's old, check the AC clutch and the drive belt. Sometimes it sounds like engine noise, but it's the AC clutch.

Posted 2 years ago

Add a comment

Helpful? (0)

Report

Jerry Answered:

The basic cause of noise being generated by a cold engine is that parts change size and elasticity during the warm-up phase. Also, internally to the engine lubrication takes a few minutes to reach its potential. The noise associated with A/C system is mostly attributed to drive belt reaching operational temperature, and the internal fluids being circulated within the system, IE, refrigerant and compressor oil. The older the vehicle, and the more miles it acquires, the more noise will be generated.