Poor Heat control
Thread Starter
Driver School Candidate
Joined: Feb 2004
Posts: 12
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From: Illinois
Poor Heat control
Perhaps I can learn from others. My 200K 2005 LS430 first has come down with a noisy blower motor but a bigger problem is that even with the car at operating temperature the heat in the cabin at times is poor. On the open highway it seems fine. Can someone point out what the issue may be? Does the LS have a vacuum assisted blending door that may have an issue?
Lead Lap
Joined: Nov 2013
Posts: 4,297
Likes: 1,225
From: IL
Possible cause would include air in the coolant system. A bubble at the
sensor would mislead the system. Highway speed has the engine and
coolant pump working at high RPM, low engine speed may be allowing
air bubbles to form. ("Captain, we're cavitating!" Hunt for Red October)
sensor would mislead the system. Highway speed has the engine and
coolant pump working at high RPM, low engine speed may be allowing
air bubbles to form. ("Captain, we're cavitating!" Hunt for Red October)
Instructor
Joined: Jul 2017
Posts: 928
Likes: 238
From: South Carolina
Its either 1 of 2 things -
1. The hot water isnt getting to the heat exchagner / heater core . could be a bubble, blockage, valve issue
2. the fan isn't moving the hot air past the heater core- could be a blend door issue, blockage, clogged filter, etc.
1. The hot water isnt getting to the heat exchagner / heater core . could be a bubble, blockage, valve issue
2. the fan isn't moving the hot air past the heater core- could be a blend door issue, blockage, clogged filter, etc.
Thread Starter
Driver School Candidate
Joined: Feb 2004
Posts: 12
Likes: 0
From: Illinois
Heat issue
Thanks for the advice - I was surprised to find the radiator almost empty. I put .75 gallon of distilled water in it and all seemed to be fine. For the life of me I could not find a leak. I put a pressure tester on the radiator and it held about 20 lbs however did go down very slowly. I ordered a new cap - figured I would start there. I pulled the engine cover off and did not see any leaks there - the engine runs fine (as always)...i do have to say 'm really bad on checking my coolant and its a good couple years checking it....can that much evaporate in that period of time?
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