About 8 months ago, my 2003 G35 started to run really hot and I had no heat in the cabin. The dealership service wanted about $130 to diagnose the problem, but I did a little research and opted to have the thermostat replaced. Everything was fine, but now the issue is back.
Should I have the thermo replaced again. It is under warranty, but I wanted to know if there might be another issue that could cause this same problem.
No heat inside the cabin is a clear sign of a heater core obstruction.
The heater core sits near the A/C blower and flows hot radiator fluid through it to warm the air when the interior thermostat (temperature selector) is set to a temperature higher than ambient.
The inexpensive solution is to get a radiator flush and hope that the heater core unblocks itself. This could also be resolved if there is a large air bubble in the heater core preventing the proper flow of fluid.
The more expensive solution, is to have the dealership or other mechanic, pull the heater core to see what's causing the blockage.
I would try the less expensive method first and make sure that the shop you take it to knows how to remove air from the radiator/heater core (this is usually done by flowing new fluid into the system while pulling out the old).
Hello,
The thermostat was a good choice however you should go to a service station and get a complete cooling system flush.
your heater core and or radiator could be clogged.
Well you have a problem If you had no heat in the cabin 8 months ago and a thermostat fixed it that is funny as when the thermostat dont open the car gets hot and you loose water because it boils from the bottom of radiator because it dosent flow around the radiator and the heater would be very hot.
So take out thermostat look at temp stamped on it and heat water on the gas and put in the thermostat If it opens its not your problem, something else is
LET ME know how you get on and we will get it sorted Ron
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