Car loses heat at idle. When rpm is raised the heat raises. When the car idles down the heat cools off. Coolent is full.
Friday, December 7th, 2012 AT 2:26 AM
Have coolant system checked for an air lock. There shold be air bleeds on higher parst of engine, try bleeding air while running to get air out.
Please consider a donation to help us answer more questions.
Friday, December 7th, 2012 AT 2:30 PM
Had this exact issue. My shop replaced thermostat. Problem persisted and I had to continue to add coolant to reservoir over a 3 day period. But no heat at idle continued.
Brad1 (2CarPros) replied April 6, 2009 to my issue and described in detail how to remove air from cooling system.
I followed the air purge process and problem was resolved. I spent $160 needlessly on stat, labor and coolant. I suspect it was air in system all the time. One symptom was a gurgling or bubbling noise behind glove compartment at start up in addition to no heat idle.