No Heat - LotusTalk - The Lotus Cars Community
 1Likes
  • 1 Post By +TSRAGR
 
LinkBack Thread Tools Display Modes
post #1 of 13 (permalink) Old 11-09-2018, 11:26 AM Thread Starter
Registered User
 
henrymfisher's Avatar
 
Join Date: Jun 2016
Location: Massachusetts
Posts: 152
No Heat

Hi guys,

So I bought an '07 Exige (Magnetic Blue) with 7000 miles on the clock three weeks ago. Yeah, very excited.

Getting ready to put the Elise on the market.

Problem is I have no heat. Here are some facts:

1. Temp Gauge comes on rises to no more than 170 to maybe 175 degrees (shouldn't normal temp be around 194-197?).
2. Heater Controls - No background lights, but the AC lights do illuminate
3. Heater Controls - Fan works fine and I can direct air to various areas (floor, windshield, vents, etc.)

So do you think the lack of heat is the typical stuck thermostat even though I have a working gauge, but temps are low?
Or do you think I have some type of defective heater control?
Or is it the dreaded sensor probe/heater pack in the radiator?

I have no way of determining what the thermostat's condition is. I bought a new solid metal one.

Any help would be appreciated.

Thanks,

Henry
'07 Exige

Henry
'05 Elise
henrymfisher is offline  
Sponsored Links
Advertisement
 
post #2 of 13 (permalink) Old 11-09-2018, 11:51 AM
Addict
 
LostPawn's Avatar
 
Join Date: Nov 2012
Location: Denver, CO
Posts: 1,128
Garage
Regarding the normal operating temp, my car will normally run around 180-190 street driving and will climb to 200-210 in heavy traffic. You might be running a little under that but I think (would have to re-read all the stuck thermostat threads) if you had a stuck thermostat you would have issues getting up to any temp, that doesn't mean your thermostat is not sticking or not functioning properly though.

Do any of the hoses in the engine bay get warm or hot?

Have you checked the coolant level cold and when hot?
LostPawn is online now  
post #3 of 13 (permalink) Old 11-09-2018, 12:35 PM Thread Starter
Registered User
 
henrymfisher's Avatar
 
Join Date: Jun 2016
Location: Massachusetts
Posts: 152
No in answer to all of your questions.

I guess I need to get her up to temp
and look at the heating hose schematic to see if the lines are hot.

I will also check the fluid levels.

Thanks,

Henry

Henry
'05 Elise
henrymfisher is offline  
 
post #4 of 13 (permalink) Old 11-09-2018, 03:21 PM
Registered User
 
KWin's Avatar
 
Join Date: Jul 2016
Posts: 98
Some people put lower temp engine thermostats in to reduce detonation.

https://www.monkeywrenchracing.com/p...z-1zz-2gr-2zr/

Let the car idle till it heat soaks, and see if you feel heat.
KWin is offline  
post #5 of 13 (permalink) Old 11-13-2018, 09:37 PM
Registered User
 
Join Date: Jan 2016
Posts: 17
my best guess upon your info is that the heater (air)control servo actuated flap is stuck in the closed position. This blocks the air trough the heater matrix and only allows ambient air (or chilled air) to enter the cabin.

The feed pipe to the heater matrix is always circulating and not plumbed in the thermostat circuit afaik - in fact the heater matrix is always hot (even with the air flap closed).

with rear undertray off, you can locate the smaller hoses going in the right sill and returning from the left sill, and assess their temperature. Follow the hose from the electric heat soak pump mounted to the coolant reservoir; that is your heater matrix circuit.
malo is offline  
post #6 of 13 (permalink) Old 11-14-2018, 05:09 AM
Sold my Exige S
 
+TSRAGR's Avatar
 
Join Date: Aug 2011
Location: TX Coast
Posts: 930
Quote:
Originally Posted by henrymfisher View Post
1. Temp Gauge comes on rises to no more than 170 to maybe 175 degrees (shouldn't normal temp be around 194-197?)....I have no way of determining what the thermostat's condition is. I bought a new solid metal one.
170-175 is warm enough for the engine and plenty hot for the heater matrix. I'd return the new t-stat as this is not the reason for no heat in the cabin.

Quote:
Originally Posted by henrymfisher View Post
2. Heater Controls - No background lights, but the AC lights do illuminate
Your electroluminescent (EL) board is dead. The phosphors decay over time. New ones are very pricey and are not worth replacing every 5 years or so.

Quote:
Originally Posted by henrymfisher View Post
So do you think the lack of heat is the typical stuck thermostat even though I have a working gauge, but temps are low?
No. Like others stated, the upper flap in the HVAC box (see image...heater matrix is in red) is probably stuck in the cool position. It's rare to have a heater matrix fail, so no worries there. Less likely, the prior owner may have installed a heater matrix bypass valve to maximize AC which could also be stuck or is simply set to the bypass position. I get plenty of heat using a 170 t-stat, and I peak around 175 in chilly weather (40s).
Attached Images
 
glb likes this.
+TSRAGR is offline  
post #7 of 13 (permalink) Old 11-14-2018, 06:32 AM
Registered User
 
Join Date: Nov 2015
Location: massachusetts
Posts: 1,906
remove the passenger access panel, remove the flexible hose and look in to see if the flap moves with the temperature control[fan on etc]

there was a recent post about this...check it out for ideas
exigegus is online now  
post #8 of 13 (permalink) Old 11-14-2018, 06:33 AM
Registered User
 
Join Date: Nov 2015
Location: massachusetts
Posts: 1,906
Oh, and I get warm air long before the temp readout registers
exigegus is online now  
post #9 of 13 (permalink) Old 11-15-2018, 09:19 AM Thread Starter
Registered User
 
henrymfisher's Avatar
 
Join Date: Jun 2016
Location: Massachusetts
Posts: 152
So the no heat problem is on an '07 Exige. I assume there is no way of accessing the flapper without a clam removal?
I pulled both access panels but the large hose is directly in the middle and not accessible.

Thoughts?

Thanks guys.

Henry

Henry
'05 Elise
henrymfisher is offline  
post #10 of 13 (permalink) Old 11-15-2018, 09:34 AM
Registered User
 
Join Date: Jul 2008
Location: San Francisco Bay Area
Posts: 705
Wait, what? The background on the heater/AC controls is supposed to light up? I've had my Elise for 10 years, and it's never lit up, I learned something new today
marcinr is offline  
post #11 of 13 (permalink) Old 11-15-2018, 09:34 AM
Registered User
 
Join Date: Nov 2015
Location: massachusetts
Posts: 1,906
Its been a while, I am thinking unbolt the fusebox, unbolt the plastic cover over the wiper motor, which has two bolts under the center spine of the clam that get loosened, but I think not removed and you can twist it out of the way enough to do it, i think
exigegus is online now  
post #12 of 13 (permalink) Old 11-15-2018, 10:02 AM Thread Starter
Registered User
 
henrymfisher's Avatar
 
Join Date: Jun 2016
Location: Massachusetts
Posts: 152
Ok, I will see what can be removed to help gain access for a visual inspection.

Thanks.

Henry
'05 Elise
henrymfisher is offline  
post #13 of 13 (permalink) Old 11-15-2018, 10:03 AM Thread Starter
Registered User
 
henrymfisher's Avatar
 
Join Date: Jun 2016
Location: Massachusetts
Posts: 152
@marcinr - yes indeed all of the controls light up with either numbers or red/blue for cool and hot, etc.

Henry
'05 Elise
henrymfisher is offline  
Sponsored Links
Advertisement
 
Reply

  LotusTalk - The Lotus Cars Community > Lotus Discussions > A/C, Heating and Ventilation

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the LotusTalk - The Lotus Cars Community forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in











Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome