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 Low Heat Issue

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bamalongroof

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Location : Huntsville, AL

PostSubject: Low Heat Issue   Sat Jan 10, 2015 5:47 pm

Hi Guys,

Three months ago changed the radiator and flushed the heater core and was making great heat until recently. The car is taking forever to warm up i'm thinking thermostat is remaining open but also after the engine is warm when slowing or stopping the air goes colder then warmer when speed or engine speed increases. First check was coolant level and was down a little topped it up but the condition persists. Are our water pumps known to break the impeller?

Or should I look elsewhere? Jeff
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buickwagon

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PostSubject: Re: Low Heat Issue   Sat Jan 10, 2015 6:08 pm

Year?
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bamalongroof

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PostSubject: Re: Low Heat Issue   Sun Jan 11, 2015 1:28 am

Sorry 1994 RMW 170K.
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jayoldschool

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PostSubject: Re: Low Heat Issue   Sun Jan 11, 2015 1:36 am

Is it warm heat when the car sits in the driveway without moving, but then cools off when driving? If yes, stuck open thermostat. You can check the actual coolant temps through the HVAC head, you will know immediately if the stat is the problem. With a good one, you can actually watch the temps raise and lower with the open/close of the stat on the highway in cold weather.
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bamalongroof

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PostSubject: Re: Low Heat Issue   Sun Jan 11, 2015 1:59 am

it does eventually heat up to slightly below mid gage when sitting only one quarter gage when moving. I will check the temps via HAVC. Jeff







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PostSubject: Re: Low Heat Issue   Sun Jan 11, 2015 12:49 pm

What temp rating is your thermostat?
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bamalongroof

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PostSubject: Re: Low Heat Issue   Sun Jan 11, 2015 2:18 pm

A 180 installed and have a 160 on hand. I' going to install the 160 unit I have but see there is some debate that we need the hotter temps for our LT1 engines. Jeff
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silverfox103
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PostSubject: Re: Low Heat Issue   Sun Jan 11, 2015 8:10 pm

Jeff, don't rule out flushing the heater core again.

Tom
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bamalongroof

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PostSubject: Re: Low Heat Issue   Mon Jan 12, 2015 11:10 pm

Thanks Tom, will do.
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200OZ
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PostSubject: Re: Low Heat Issue   Fri Jan 16, 2015 9:46 pm

X2 on flushing the heater core.
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bamalongroof

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PostSubject: Re: Low Heat Issue   Fri Jan 16, 2015 9:57 pm

Drove to the airport on Wednesday and think it is the thermostat but as part of the process to replace it this weekend I will flush the core again never hurts to do it again. Jeff
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bamalongroof

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PostSubject: Re: Low Heat Issue   Sun Feb 08, 2015 1:00 am

Warmed up nicely today so replaced the thermostat the old one must have been stuck open... after a flush of the heater core my hand feels like its burning held to the vents. The temp gauge is between 1/4 and 1/2 and does not rise when stopped.

I'm happy but couldn't find my 160 stat so had to run to the store for the 180.

This has been the the norm with new wifey in the house... she is banned from my office and garage or I may not be able to find anything.... Jeff Very Happy
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phantom 309

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PostSubject: Re: Low Heat Issue   Mon Feb 09, 2015 2:06 am

there is no advantage at all running a 160 stat,.unless you reprogram the pcm as well,.

this mod was done in the early days, so a more aggressive tune could be put in,.the fans also need to come on sooner to keep the rad cool,.
the coolant ends up with very little soak time in the rad to dissipate heat,.
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