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Cold start good but won't hot start, have to wait apps 30 mins

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How hot is it showing on the gauge ? Do you hear cooling fans on ?They will remain on for a bit after the key is turned off ! You should have the vehicle hooked up to a diagnostic scan tool to check engine data , see what the ECT - engine coolant temperature sensor is showing the PCM - powertrain control module . It could be a couple of other sensors also , so having the sensor data checked is the best way to go ! I know that's an option most people don't care to do , but just replacing parts can get expensive !

Posted on Apr 10, 2015

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Getting too hot

Posted on Apr 10, 2015

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Posted on Jan 02, 2017

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1 Answer

When she cold she'll go when she hot she won't start,take a hour for her to cold down before starting


I had a car that did that to me, turned out to be the battery. It was getting old and needed replacing. You could clean the contacts for the battery as well, might help a little. My car ran for a hour or more but if I stopped and tried starting shortly after I was toast. Had to wait 45 min. or more to start. Hope this helps.

Mar 10, 2013 | Cars & Trucks

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2004 pt cruiser won't start sometimes after you


Good chance fuel pump is getting hot and has to cool down before pumping back up to required pressure. I had to test fuel pressure when cool, then when hot to catch drop in pressure. Are you having any problems with how far you can drive before it quits, or starts to get sluggish?

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Car has trouble starting when hot


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Aug 14, 2012 | 1994 Oldsmobile Bravada

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We have a 530 diesel bmw ,fails to start if hot


We do not have BMW diesels (thank goodness) in the USA. That said has the engine control moule been scanned for fault codes? You must do this 1st.

Apr 30, 2012 | 2001 BMW 5 Series

1 Answer

I HAVE NO DRIVERSIDE HEAT


The actuator that 'blends' cold with hot is stuck in the cold position. There are a couple of options. Disconnect the battery, then drive the vehicle around without using the AC for 10 min, if the AC is defaulted to come on after a battery interuption, then shut the car down then turn it on again. You are trying to get the electronic actuator to reset and resume proper function. Another option is to try this: Start the car, adjust the pax side full hot, drivers full cold, wait 30 sec then shut car down, then start car back up and reverse the settings, pax full cold, drivers full hot. In both solutions, the vent actuators are stuck at either the full open or full closed, so you are trying to get it to 'self check' and allow them to resume proper function. After two years, I simply removed them altogether since I live where it is hot an only need cold.works just fine....

Nov 21, 2011 | 1997 Cadillac Eldorado

1 Answer

I have a 2003 Buick Rendezvous. The drivers side blows hot air and the passenger side blows cold air. The car has that dual zone climate control. I have no clue where to start.


The actuator that 'blends' cold with hot is stuck in the cold position. There are a couple of options. Disconnect the battery, then drive the vehicle around without using the AC for 10 min, if the AC is defaulted to come on after a battery interuption, then shut the car down then turn it on again. You are trying to get the electronic actuator to reset and resume proper function. Another option is to try this: Start the car, adjust the pax side full hot, drivers full cold, wait 30 sec then shut car down, then start car back up and reverse the settings, pax full cold, drivers full hot. In both solutions, the vent actuators are stuck at either the full open or full closed, so you are trying to get it to 'self check' and allow them to resume proper function. After two years, I simply removed them altogether since I live where it is hot an only need cold.works just fine....

Nov 10, 2011 | 2003 Buick Rendezvous

1 Answer

How do i reset climate control


There are a couple of options. Disconnect the battery, then drive the vehicle around without using the AC for 10 min, if the AC is defaulted to come on after a battery interuption, then shut the car down then turn it on again. You are trying to get the electronic actuator to reset and resume proper function. Another option is to try this: Start the car, adjust the pax side full hot, drivers full cold, wait 30 sec then shut car down, then start car back up and reverse the settings, pax full cold, drivers full hot. In both solutions, the vent actuators are stuck at either the full open or full closed, so you are trying to get it to 'self check' and allow them to resume proper function. After two years, I simply removed them altogether since I live where it is hot an only need cold.works just fine....

Nov 01, 2011 | 2008 Cadillac STS

1 Answer

I have 2003 GMCHD 2500 and the heater is not blowing hot air, turned off the truck and started it again and it will blow hot for 5 seconds and turn to cold again. have you come across this problem before


It is running a test cycle and getting stuck. There are a couple of options. Disconnect the battery, then drive the vehicle around without using the AC for 10 min, if the AC is defaulted to come on after a battery interuption, then shut the car down then turn it on again. You are trying to get the electronic actuator to reset and resume proper function. Another option is to try this: Start the car, adjust the pax side full hot, drivers full cold, wait 30 sec then shut car down, then start car back up and reverse the settings, pax full cold, drivers full hot. In both solutions, the vent actuators are stuck at either the full open or full closed, so you are trying to get it to 'self check' and allow them to resume proper function. After two years, I simply removed them altogether since I live where it is hot an only need cold.works just fine....

Nov 01, 2011 | 2003 GMC Sierra

1 Answer

94 chevy 1500 will start for about 30 mins. and then just stop


Does it blow black smoke when it's hot? if so, Replace the cold start sensor. If not check to make sure your cats aren't plugged, (they will get red hot). If they are plugged the engine will loose power and stall.

May 29, 2009 | 1999 Chevrolet Silverado 1500

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