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Old 01-10-2010, 03:32 PM   #1
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Default Question for a mechanic

My wife has a Infiniti G35 that the heater only blows hot when the RPM's are up. When the car is at idle it blows cold, but as soon as you leave a light itblows hot again almost immediately. Thanks for any info.
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Old 01-10-2010, 04:03 PM   #2
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Default RE: Question for a mechanic

Very first thing to do is check the coolant level.



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Old 01-10-2010, 05:27 PM   #3
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Default RE: Question for a mechanic

Tuna Man could be right,that is the first check but you are describing a possible vacume air leak also. Either your vent system is electronic, Or vacume operated. Do you hear a hiss under the hood at idle? Do you have climate control, No Not AL Gores!Manual systems usually are vacume operated. Auto systems are usually electronic. Meaning if you dial the temp up digitally, Its probably electronic. If you turn a knob or slot type slidehandle. Should be vacume. Need more info to go furthur. What engine size, Type of system,year, Auto trans, manualetc.
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Old 01-10-2010, 05:32 PM   #4
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Default RE: Question for a mechanic

Kenny, The coolant level is full and it is a electronic system. It is a 3.5 in it. This has me stumped!
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Old 01-10-2010, 05:43 PM   #5
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Default RE: Question for a mechanic

Sounds to me like a possible airlock in the heater core. If this is the case you may only be using a small percentage of the core and the coolant is cooling down too quickly at idle.
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Old 01-10-2010, 05:47 PM   #6
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Default RE: Question for a mechanic

Quote:
MAXWELL (1/10/2010)Kenny, The coolant level is full and it is a electronic system. It is a 3.5 in it. This has me stumped!
Need year, Engine size. pm Me Also check to see if the heater hoses going into the dash are as hot as the radiator hoses. An air block may be it but may not be. Coolant level, Vacume leak, or electrical are usuall problems.
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