Heater blowing Cold

Reply Subscribe

Thread Tools

Search this Thread

Jan 9, 2019 | 05:15 AM

Akasha

Thread Starter

Driver School Candidate

Joined: Jan 2019

Posts: 1

Likes: 0

From: Kansas

Heater blowing Cold

2004 LX430, 130K Today after the car resting for a week, the heater did not engage at 4:30 am-26°. I drove 5 miles to pick up my mom, we went through a drive thru and I began to overheat. drove 1 mile and I was in the red. Pulled into a parking lot and heat kicked on. The temp came back down to normal and I finished my drive in the warm, about 3 miles. Does anyone one know a fix?

Jan 9, 2019 | 05:27 AM

ls430w140

Advanced

Joined: Dec 2017

Posts: 716

Likes: 168

From: FL

Quote:

Originally Posted by Akasha

What are you looking for to fix? I would worry more about engine overheating than heater problem.

Jan 9, 2019 | 12:51 PM

Catalina45

Pit Crew

Joined: Dec 2017

Posts: 203

Likes: 33

From: Texas

Quote:

Originally Posted by Akasha

Could it possibly be a thermostat that stuck closed and then later opened? Have you tested the antifreeze to determine that its concentrated enough to handle -26-degrees?

Jan 9, 2019 | 06:23 PM

caddylover

Pit Crew

Joined: Oct 2018

Posts: 171

Likes: 21

From: Manitoba

i'd look at your thermostat. Had the same issue with one of my cadillacs.

Jan 11, 2019 | 05:00 AM

sturo

Driver School Candidate

Joined: Jan 2019

Posts: 4

Likes: 0

From: Delaware

I recently purchased my LS 430 about a week ago and had the same problem. The coolant was really low. Evidently it evaporates over time in this vehicle, so it's something you need to check every few months. I topped it off and also replaced the thermostat because it was a cheap and easy change-out. After that I ran the car with the temp on HOT and fans at full for about 10 minutes to get rid of any air bubbles in the system. It still takes a few minutes to heat up, but 1000% better.

Jan 19, 2019 | 10:50 AM

kwvsp

Driver School Candidate

Joined: Dec 2006

Posts: 2

Likes: 0

From: MN

If the heater starts to blow colder air when the engine is at idle, but warmer temps when driving, the most likely issue is low coolant level. If the coolant level is low, there may be an air pocket. As the prior poster (sturo) said, just add coolant (antifreeze) and this should fix the issue.

Jan 19, 2019 | 11:15 AM

TominPT

Instructor

Joined: Jan 2018

Posts: 974

Likes: 301

From: WA

You should also consider why you are losing coolant. In my '05 I had noticed a very slow loss of coolant from the reservoir over several months. I replaced my radiator cap, as was recommended in another recent post, about two months ago, with an OEM cap. Since then I have not lost any coolant whatsoever in about 1,000 miles of driving. I also monitor the coolant level every few hundred miles to confirm that remains the case.