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I have a 2007 HHR, my temp gauge stops working and the same time the a/c stops blowing cold air...I called myself checking fuses and a relay, can you help?

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  • Cars & Trucks Master
  • 11,452 Answers

You mean the blower motor stops blowing air , the A/C compressor is still engaged ? The temp gauge shouldn't have anything to do with the blower motor .But stranger things have happened on these systems when they are controlled by a electronic module (BCM )
Circuit/System Description
The instrument panel cluster (IPC) displays the engine coolant temperature as determined by the engine control module (ECM). The ECM sends the temperature data via high speed GMLAN serial data to the body control module (BCM). The BCM then sends the information via low speed GMLAN to the IPC in order to display the engine temperature.
The BCM applies voltage to the blower motor through the HVAC relay. The resistors and the blower motor are in a series circuit. The following list represents the number of resistors in series with the blower motor per particular speed request:
• Low speed--4 resistors
• Medium 1 speed--3 resistors
• Medium 2 speed--2 resistors
When the operator requests High speed, the HVAC control assembly applies ground directly to the blower motor through the high blower motor control circuit.
Do you know anything about automotive serial data communications ? GMLAN Is general motors version of C.A.N controller area network .

How to Diagnose Controller Area Network CAN

Do you know anything about diagnosing automotive electronics ? Using a digital volt ohm meter ? Using wiring diagrams to pin point locations in a electrical circuit for testing ? Do you know what a factory componet location diagram is ? It takes more then looking at fuse's an relays , to see if current is flowing in a electrical circuit .

Electric Testing Techniques You Need to Know

ECM Inputs and Outputs Diagnosis

http://www.bbbind.com/free_tsb.html Free wiring diagrams ! Enter vehicle info. Year , make , model and engine size ! Under system click on HVAC , under subsystem HVAC Controls . Then click the search button , then click the first blue link . This is the blower motor control diagram . Do you know how to read a wiring diagram ?

Posted on Apr 30, 2017

Testimonial: "The blower work fine the A/C is not kicking in and temp gauge goes flat. It has done this before, but after a few miles it would both start working."

  • 1 more comment 
  • Jeff Armer Apr 30, 2017

    Do you know what DTC'S are ? Diagnostic trouble codes ,It would be a good idea to have the vehicle check for codes ! Not the engine OBD2 codes . Need a professional type or a factory scan tool ! If no codes are found checking power an grounds for the BCM - PCM/ECM

  • Jeff Armer Apr 30, 2017

    https://www.youtube.com/watch?v=lEBKcyq3...

  • John Coffee
    John Coffee May 01, 2017

    Thanks will do that today...

×

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dr_layinlow
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SOURCE: 2001 malibu-heater is blowing cold air

sounds like you have a bad temperature sensor in dash or the cable has eitehr broken or come off the heater switch under the dash!!

Posted on Dec 07, 2008

MARZX
  • 61 Answers

SOURCE: air conditioner, fuel gauge, and temp gauge all stopped working at the same time

Three possibilities;
All related to blown fuses,

1- Fuse blown in the engine compartment LH.
2- Fuse blown in the cabin forward LH below the dashboard (below your legs left hand).
3- Fuse blown in the harness (wire bundles) below the dashboard very easy to reach with your hands “just look underneath steering wheel ".

U said " The air conditioner blows, but the air is not cold.
" Yes only the fan working which might receiving power independent all from those other mentioned things.
If all fuses OK. Then look for broken wires.

Regards;
MAR

Posted on Jun 03, 2009

jturcotte
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SOURCE: 2005 sentra 1.8 no heat...

Hi, the likely problem is a bubble forming in the system, possibly due to a head gasket failure.

Try stopping on a steep incline--does the heater stay warm? If yes, what you have is an air bubble that hangs at the heater hose until pressure from the water pump blows thru it as the engine speeds up. Park on an incline, open the radiator cap, run the engine until the thermostat is open, turn the heater on, crack open any/all bleed ports to release any trapped air, and fill the radiator to the neck. Wait until the level stops dropping and make sure bubbles don't continue to come up. If they do, you may have a blown head gasket that will keep forming these bubbles until you change the gasket.

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SOURCE: heater blowing cold air in my 1994 toyota corrolla gauge goes up then back down

Click the link below :----http://wikisolutions.blogspot.in/2012/02/get-free-answers.html

Posted on Feb 12, 2012

skychief2001
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SOURCE: ac is blowing warm air now in my 2005 chrysler town and country after blowing cold air all day

Is the radiator fan still coming on ? Is the compressor running ?

Posted on Jul 31, 2012

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Three possibilities;
All related to blown fuses,

1- Fuse blown in the engine compartment LH.
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3- Fuse blown in the harness (wire bundles) below the dashboard very easy to reach with your hands “just look underneath steering wheel ".

U said " The air conditioner blows, but the air is not cold.
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Regards;
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