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I have a 1991 ls400, in the summer time while the ac was on the coolant over flowed a couple of times but the ac continue to work, and the temperature never read over heated...now that its cooler outside i been having problems with the heat, it only blow cold air....i let the engine heat up for about 20 mins. poured hot water in the radiator moved the radiator line and now its blowing fine, what can be the problem???

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  • 51 Answers

Bad water pump.

Posted on Oct 22, 2013

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Posted on Jan 02, 2017

  • 2 Answers

SOURCE: 1992 Jeep Wrangler heater not blowing hot air

How often has the coolant been changed? My only guess is that it hasn't and the hoses and the heater core are plugged up with goo and a flush is needed

Posted on Dec 26, 2008

  • 11 Answers

SOURCE: heater blowing cold air with coolant, fine with plain water

it sounds like the heater core is clogged bad if u know someone with a air compressor put a air nossel on it that you pull the trigger to blos air in to the heater core after you take the lines off i had to do this before on a jeep cherokee it did the job

Posted on Jan 11, 2009

  • 1 Answer

SOURCE: Intermittent AC and Heat w/ long gaps of hot(for AC) or cold(for heat) air

I had similar problem on my 2001 Insight. Had to replace some cooling system hoses eaten by rodents... Works like a champ again.

Posted on Mar 19, 2009

  • 713 Answers

SOURCE: Drivers side AC will blow hot air.

the blend motor on the vehicle is probably bad

Posted on Aug 20, 2009

  • 15 Answers

SOURCE: ford ka heater blows hot air all the time

Your problem is a faulty heater control valve. The design used on these vehicles allows for hot water to flow constantly and compete with the evaporator as there is no blender door. You have to replace the valve and possibly the control head. Meanwhile, you can bypass the valve to have cold air

Posted on Sep 12, 2009

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1 Answer

I have no electrical power in the car


Probably time for a new battery.

Dec 30, 2012 | 1991 Lexus LS 400

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1991 lexus ls400 antifreezecoolant facts


All brands & types of coolant cost the same at the
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Not all that hard,every store has every oem required
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97 eldorado idles and does not run hot, only when driving car runs hot.


May be its low on coolant or radiator hoses clogged or its thermostat issue,its remaining closed or it can be issue with coolant leaking from somewhere.Or cooling fan not running when when engine gets warm.
-----------


There are many other possibilities causing these issues.:----
To troubleshoot the issue yourself,i provide you few very helpful links with solutions:-----
Click the link below:----

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http://schematicsdiagram.blogspot.in/2012/03/dodge-dakota-stallsstumbles-at-idlehas.html

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http://whatisbyme.blogspot.in/2012/05/1991-toyota-trecel-engine-starts-fine.html

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1995 Lexus LS400: Running Hot?

http://whatisbyme.blogspot.in/2012/05/1995-lexus-ls400-running-hot.html

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Multiple problems on car: Car runs hot, A/C blows hot and car starts surging?
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-----------

There are many possibilities for car overheating.

Faulty thermostat clogged radiator/plugged radiator, radiator hose worn out. Coolant running low. Low coolant pressure. Faulty temperate sensor.



I suggest you to go through the troubleshooting details mentioned in the link below:-----


All types of car overheating problems and troubleshooting?

http://technoanswers.blogspot.com/2011/11/all-types-of-car-overheating-problems.html

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These will help.

Thanks.

Dec 06, 2012 | Cars & Trucks

1 Answer

My 93 lexus ls400 keep turning off ever since i had a tuneup done. I notice that the ac condenser fan is not working but i dont run the ac.It doesn't read that it gets hot But it seem if the car g


Be sure you check engine oil level often. The low oil sensor will disable the ignition. If you turn A/C on the cooling fan should run continuous, Check the fan relays. Make sure coolant level is correct at recovery bottle, never open radiator cap. A scald hazard exist, be careful. This car is old and complicated, and is beyond your skill level to repair. Try to inquire here for advice, whenever possible. Don't throw good money at bad money

May 27, 2017 | 1991 Lexus LS 400

1 Answer

Car doesn't respond when gas pedal is pushed when it is driven in hot weather; engine does not stall (1991 lexus ls400


I had the same problem with my 1992 LS400. My Lexus mechanic fixed it by replacing the MAF(Mass Air Flow).

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Oct 25, 2010 | 1991 Lexus LS 400

2 Answers

My lexus ls400 1991 the two electri fan all time is on


Either the temperature sensor on the radiator, or the relay is bad.
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Jul 19, 2010 | 1991 Lexus LS 400

1 Answer

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Aug 13, 2008 | 1991 Lexus LS 400

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